Search Results for: corn borer

May 8, 2013

Veg IPM Update : Week Ending 5/08/13

Sweet Corn

By this time last year, we had already begun catching European corn borer (ECB) adults, as well as a few corn earworm (CEW) adults. Due to much cooler conditions this season, blacklight trap catches have very few insects of any type. As a result, there will be no maps published in this IPM Update. In general, sweet corn is well behind recent seasons in terms of development. As ECB numbers develop, their activity will be reported here.

Cole Crops

In many locations, imported cabbageworm butterflies (ICW) are active. These butterflies were seen laying eggs on kale in Hunterdon County this week. Egg deposition is undoubtedly occurring all over the state, during warm periods. Be sure to check the youngest portions of plants, as this is often where the ICW larvae go to feed. Feeding can damage the growing point of plants, if it is not detected in time. Check 5 consecutive plants each in 10 random locations throughout the field. Consider treating if caterpillars are found on 10% or more plants that are in the 0-9 true leaf stage. From 9-leaf to the early head stage (in broccoli, cauliflower and cabbage) infestations up to 20% may be tolerated. Once heads begin to form, a 5% threshold should be observed to protect the marketable portion of the plant. For leafy greens such as collards and kale, 10% plants infested is the threshold throughout.

Crucifer flea beetle is active on many plantings, particularly when conditions are warm. When scouting cole crops for caterpillar pests, check for the presence of flea beetles. Consider treating if flea beetles are present on 50% or more plants, and feeding injury is evident on the plants. Be sure to monitor newly emerged or transplanted fields for the presence of this pest. In general, plants like arugula and mustard (those with a “hotter” flavor) are more favorable to flea beetles.

Filed Under: Vegetable Crops
May 1, 2013

Vegetable IPM Update: Week Ending 5/1/13

Rutgers Cooperative Extension IPM personnel are currently deploying blacklight trap and insect pheromone trap networks throughout the state. Sampling will commence within one week, and insect data will be published in the Plant and Pest Advisory Online and on the Pest Map Archive as soon as target pests begin to appear. [Read more…]

Filed Under: Vegetable Crops
September 26, 2012

Vegetable IPM Report September 26, 2012

Filed Under: Vegetable Crops
July 13, 2012

Vegetable IPM July 13, 2012

-Kristian Holmstrom

Sweet Corn
European corn borer (ECB) adult catches have begun to increase again in some parts of the state. This is an indication that the second flight is starting. The most consistent catches at this time are in Salem and Cumberland counties, although low level catches are also being recorded in Morris and Burlington counties (see ECB Map). Plants are largely free of ECB injury at this time, but the situation will change within 2 weeks, as eggs are laid and larvae begin to feed. Consider treating if 12% or more plants exhibit the characteristic “shot-hole” type feeding on leaves and/or droppings or ECB larvae in emerging tassels. Remember to make a full-tassel application to control ECB larvae as they leave the tassel and travel down the stalk to re-enter the plant near the ear shank. This last application is often critical to controlling ear infestations from ECB. Consider weekly applications through the silk stage unless local corn earworm catches dictate a tighter schedule. This will help prevent ear infestations resulting from eggs laid on or near the developing ear.

The highest nightly ECB catches for the previous week are as follows:

Shirley 3 Green Creek 2 Eldora 1
Burlington 2 Shiloh 2 Long Valley 1
Chester 2 Allentown 1 Morristown 1
Denville 2 Downer 1 Oldwick 1

 

Corn earworm moth (CEW) catches are highly variable at this time. From lower Burlington County south, there are higher numbers, with particular hot-spots in Salem and Cumberland counties (see CEW Map). Pheromone catches near the Camden/Atlantic County border, as well as Salem and Cumberland counties have increased significantly over the past week as well. These moths are a threat to the sweet corn plantings now in the silk stage. As silks begin to appear, pay close attention to CEW catches in local blacklight traps, and treat silking plantings accordingly. Begin silk spray schedules as close to first silk as possible.
The highest nightly CEW catches for the previous week are as follows:

Centerton 5 Downer 2 Hammonton 1
Woodstown 5 Indian Mills 2 Medford 1
Cedarville 3 Shiloh 2 Pedricktown 1
Jones Island 3 Tabernacle 2 Shirley 1

 

Silking Spray Schedules*
South – 3-4 days
Central – 5-6 days
North – 6-7 days
* Note: These are general recommendations. Local trap catches may indicate some variation in the frequency of insecticide applications to silking corn.

Peppers
With the beginning of the second ECB flight, it is a good idea to scout fields at least weekly for the presence of ECB eggs. If 2 or more eggmasses are found in a 50 plant sample (2 leaves/plant), a foliar insecticide application should be considered. Generally, where blacklight trap catches average one or more ECB per night (shaded and crosshatched areas on the map, and blue and green areas on the web version, found at: http://www.pestmanagement.rutgers.edu/IPM/ Vegetable/Pest%20Maps/maparchive.htm) and fruit are greater than ½” in diameter, insecticides are warranted. See the 2012 Commercial Vegetable Production Recommendations for materials useful in controlling ECB. Beet armyworm (BAW) larval populations have been found on various crops in southern NJ. This pest is typically a threat to peppers, and as new plantings become established, growers should be on the alert for this pest. BAW larvae feed on leaves near the growing points on plants. This feeding can result in significant defoliation and ultimately fruit damage, as the larvae begin to feed there as they grow. BAW is another of our southern invaders that has shown up much earlier than expected. Like FAW, BAW can be difficult to control with older materials. See the 2012 Commercial Vegetable Production Recommendations for newer materials useful in controlling BAW.

Brown Marmorated Stinkbug (BMSB)
BMSB adult catches are still low in most blacklight traps, although numbers have been increasing gradually over the past two weeks or so. At present, the only trap averaging more than 5 BMSB/night is near Shirley in Cumberland County (see BMSB map). BMSB has shown a preference for peppers in the past. Growers should pay close attention to activity from local traps to determine when to initiate field monitoring of this pest.
The highest nightly BMSB catches for the previous week are as follows:

Shirley 15 Jones Island 4 Indian Mills 3
Denville 5 Morristown 4 Oldwick 3
Green Creek 5 Flanders 3 Shiloh 3
Hammonton 4 Folsom 3 Oxford 3

 

Tomatoes
With prolonged hot, dry weather, thrips have begun to increase in a number of scouted tomato fields. Flower thrips may be found by tapping upper level fresh flower clusters over an index card. This should be done at least once a week. If there is a sharp increase in the number
of flower clusters having thrips, consider an insecticide to suppress their numbers. These insects can cause a golden colored “fleck” to the surface of fruit. This injury is largely cosmetic, but can result in unmarketable fruit. Generally, if thrips are found in less than 50% of flower clusters, the threat is low. However, if multiple thrips are found in more than half of the samples, and numbers have increased, an insecticide may be warranted. See the 2012 Commercial Vegetable Production Recommendations for newer materials useful in controlling flower thrips.

Filed Under: Vegetable Crops
July 7, 2026 , , and

Fruit IPM Report for Week of 6/29/2026

 

Apples
Disease Management Considerations
  • Bitter rot symptoms observed in southern and northern counties.
  • Hot, humid weather will increase the risk of fruit rots, including white rot, bitter rot, black rot, sooty blotch, and flyspeck.
  • Cultural control practices will help to minimize impact from disease in orchards: prune for improved air circulation, thin fruit clusters to reduce humidity and inoculum buildup, and cut out cankers that serve as inoculum sources.
  • Broad-spectrum fungicides, such as captan and ziram, are effective. Captan alone may not adequately suppress severe summer disease pressure.
  • Adding single-site products such as Merivon, Luna Sensation, Pristine, Omega, and Aprovia may improve control. The addition of phosphonate products such as ProPhyt or Rampart to captan sprays can improve control of rots and other summer diseases, including sooty blotch and flyspeck. It may help suppress scab infections when present.
  • Where fire blight is present, it is appropriate to prune out infected shoots. Do not cut out infections during wet weather, as bacteria can spread through water. The recommendation is to cut back to last year’s growth, at least 12” back into healthy tissue, and to sterilize pruners between cuttings.
  • Maintain coverage of captan, manzate, or ziram before rain events through the growing season according to the cover spray rule of applications every 2” of rain or 14 days, whichever comes first, to reduce the spread of foliar diseases, including Marssonina Blotch, Glomerella Leaf Spot, and Frogeye Leaf Spot. Foliar diseases can contribute to inoculum build-up in the orchard and significant defoliation of the canopy if left untreated.
  • Rainy seasons require tighter fungicide intervals to maintain coverage. Consider refreshing fungicide protection before major rain events.
Insect Update

Codling Moth (CM): On average, trap counts remain low in orchards across the state, with some numbers increasing at a few sites. Second-generation timings are updated below. Consider management if >5 moths are caught per trap or if fruit injury is observed (Figure 1).

Codling moth injury and larva in developing fruit.

Figure 1. Codling moth injury and larva in developing fruit.

Codling Moth Degree Day Timing – Second Generation
Application and Insecticide Type
County Area Biofix Rimon:

75-100DD + 14-17 days later

 

 Intrepid

1150 + 1450 DD

Diamides – Altacor, Voliam mixes: (150-200 DD)

 Madex

1250 DD + every 7-9 days during brood hatch (later if first spray is an IGR)

 Standard Insecticides –  Delegate, Avaunt, OP’s, carbamates, pyrethroids

1250 DD + 1550 DD

 
DD 1150 1450 1250 1250 1550
Southern April 20 N/A N/A past 7/10 past past 7/13
Northern  May 5 N/A N/A past 7/13 7/6 7/6 7/17

Scale: Crawler emergence continues, and injury has been observed on fruit in some orchards (Figure 2).

San Jose scale crawlers on apple.

Figure 2. San Jose scale crawlers on apple.

Control options during crawler emergence include Neonicotinoids (suppression only), Sivanto, Esteem, and Centaur. See also the scale discussion under the peach section.

Woolly Apple Aphid (WAA); Green Apple (Spirea) Aphids (GAA): Populations continue to build in some orchards statewide, but on average remain below treatment levels. A treatment threshold is set at 50% of the terminals infested with live colonies. Predation by lady beetles and other predators and parasitoids has been observed and can help to maintain pest populations below damaging thresholds. Scout in known hotspots for WAA colonies now. Minimize use of pyrethroids to manage insect pests, including Brigade and Mustang Max, which can flare pest populations and knock down beneficial organisms and predators. Movento will control WAA and GAA and can suppress scale when crawlers are active. Research from Dr. Monique Rivera at Cornell University has demonstrated good control from Sefina for WAA and can be considered instead of late Movento applications.

Potato leafhopper injury in new apple shoots.

Figure 3. Potato leafhopper injury in new apple shoots.

Potato leafhopper (PLH): Adults and nymphs are present and increasing in apple orchards throughout the state. Feeding damage from PLH results in “hopperburn” symptoms, which include browning & necrosis along leaf margins, along with leaf curling and stunting (Figure 3).

Consider treatment, particularly on young, non-bearing fruit trees. The preferred materials for leafhopper control include Actara, Admire, Assail, Belay, Endigo, and Voliam Flexi.

Ambrosia Beetle: Trap captures have been low in orchards across the state. Monitor for signs of stress or infested trees with “toothpicks” from boring activity and consider trunk sprays if needed.

Dogwood borer: Adult male moths caught in pheromone traps decreased significantly from previous weeks, indicating peak flight activity is coming to an end.

Traps

Average Trap Captures in Apple – Southern Counties

  Week STLM TABM CM OFM DWB AMBROSIA BEETLE BMSB
5/11/2026 18  11  6 3   25   2 –
5/18/2026 16 21 3 10   54 13 –
5/25/2026 1.3 23 2 2   71 7 –
6/1/2026 378 33 3 2   49 6 0.4
6/8/2026 258 11 2 1   61 21 1.2
6/15/2026 355 4 0.6 1.5   57 13 0.8
6/22/2026 178 5 0.6 2   54 8 1.2
6/29/2026 504 0.3 0.1 0.5   27 12 0.8

 

Average Trap Captures in Apple – Northern Counties

  Week STLM TABM CM DWB AMBROSIA BEETLE BMSB
5/11/2026 13.7 1.5 1.8 12.8 1.1 –
5/18/2026 8.3 13.25 2.4 18.5 10.8 –
5/25/2026 2.2 13.75 1.2 24.5 5.1 –
6/1/2026 25.1 24.3 3.4 23.8 9.4 0.3
6/8/2026  94 22.3 0.3 24.6  18 1.4
6/15/2026 68 22.3 1 22.6 14 1.1
6/22/2026 105.9 35 0.7 27.2 8.2 0.5
6/29/2026 100 11.5 0.3 28.9 5.3 0.3
Pears
Disease Management
  • Foliar diseases should be managed with Mancozeb or Ziram, plus a single-site fungicide, to maintain pressure and inoculum at low levels, protecting fruit and maintaining a healthy orchard going into the next season.
  • Where fire blight is present, it is appropriate to prune out infected shoots. Prune out strikes on dry, cooler days, cut back 8-12” back into healthy tissue, and sterilize pruners between cuts.
Insect Update
  • Pear psylla adult and egg stages are present in orchards where populations persist.
  • Options for control include Actara, Assail, and Belay (IRAC group 4A); Sivanto Prime (IRAC group 4D); Delegate (IRAC Group 5); and products containing abamectin (IRAC group 6). Other options include Movento (IRAC Group 23). The addition of 0.25-1 gal of summer oil may improve control. Avoid applying oil at high temperatures, and do not mix with captan. Be sure to read and follow the label instructions for adding penetrants to products.

Peaches
Disease Management
  • Brown rot can be found on developing fruit in southern NJ orchards (Figure 4).
    Brown rot on mature fruit.

    Figure 4. Brown rot on mature fruit.

    Growers should rely on a captan-based program for mid-season covers, followed by better materials during the last 3 weeks’ pre-harvest, where fruit is present and being harvested. See the New Jersey Commercial Tree Fruit Production Guide for more information.   

Insect Update

Oriental Fruit Moth (OFM): We are past the window to target the second generation.

Japanese Beetles: Japanese beetles have been observed feeding in orchards. Products containing imidacloprid (Admire Pro, Leverage 360) are effective and have a short preharvest interval.

Scale: Crawler emergence is active in orchards across the state. If crawlers are present, treatment options include Movento, Esteem, Centaur, Sivanto, and neonicotinoids (for suppression only). Movento and Esteem should be applied a week before or at the start of crawler emergence.

Thrips: Thrips injury has been found in orchards throughout the state (Figure 5).

Russeting on peach from early thrips feeding injury.

Figure 5. Russeting on peach from early thrips feeding injury.

Delegate or Entrust at the highest labeled rate are the usual recommended materials for thrips present in stone fruit. Time applications starting at petal fall to reduce injury. Lannate also has activity on thrips. These materials all have short PHI’s and may be applied close to harvest where thrips are observed.

Tarnished plant bugs and other catfacing insects: Insects are active, but new fruit feeding injury has been minimal.

Brown Marmorated Stink Bugs: Brown Marmorated Stink bugs are present at low to moderate levels and numbers are increasing from previous weeks in orchards statewide. Eggs are hatching and nymphs are present (Figure 6). See the NJ Tree Fruit Production guide for effective materials.

Lesser and Greater Peach Tree Borers: Male moth captures in pheromone traps decreased in number from previous weeks. Mating disruption is recommended to maintain low populations in your orchards.

Traps

Average Trap Captures in Peach – Southern Counties

  Week OFM TABM LPTB PTB BMSB
5/11/2026 5 10 – – –
5/18/2026 4 20 – – –
5/25/2026 2 20 31 1 –
6/1/2026 4 46 28 3 0
6/8/2026 8 13 25 3 0.75
6/15/2026 5 6 13 3 0.75
6/22/2026 6 4 23 7 1
6/29/2026 3 0.2 16 6 2

 

Average Trap Captures in Peach – Northern Counties

  Week OFM LPTB PTB
5/11/2026 4.4 24 0
5/18/2026 2.4 16.5 0.2
5/25/2026 0.7 8.75 0.1
6/1/2026 1.8 11 0.5
6/8/2026  0.6  8.5 0.05
6/15/2026 3.5 9.7 1.2
6/22/2026 3.4 7.4 1.6
6/29/2026 2 4.6 1.1

 

Blueberries
Insect Update

Scouting was conducted last week across 119 conventional and organic blueberry fields in Burlington and Atlantic Counties.

This week, the IPM monitoring team observed signs of cherry fruitworm infestation in developing fruit, although infestation levels remain low.

Aphids: Aphid populations remain low at an average of 1–5 aphids per shoot.

Spotted-wing drosophila & Blueberry maggot: Trap captures increased in both Atlantic and Burlington Counties for spotted-wing drosophila. An increase in blueberry maggot trap captures were observed in Atlantic County (Table 1).

Table 1. Spotted-Wing Drosophila and Blueberry Maggot Traps

Spotted-Wing Drosophila Blueberry Maggot
Atlantic County Burlington County Atlantic County Burlington County
Avg High Avg High Avg High Avg High
6/6 8.99 35 2.86 7 0.03 1 0 0
6/12 9.9 46 3.7 25 0 0 0 0
6/20 10.24 48 8.22 35 0 0 0 0
6/27 6.96 78 3.6 18 0 0 0 0
7/3 29.78 273 50.9 81 0.33 27 0 0

 

SWD remains the primary target for insect management. When selecting insecticides, special consideration should be given to products with shorter pre-harvest intervals (PHIs) that provide effective control of these pests while also helping suppress scale crawlers, aphids, and other pest populations above threshold levels. For more information, see the Blueberry Bulletin or Commercial Blueberry Pest Control Recommendations for New Jersey for recommendations.

Diseases

The IPM team continues to observe higher levels of anthracnose than in the previous week. The recent wet weather is conducive for anthracnose development on berries. Fungicide applications are still merited in fields where anthracnose has been reported. Phosphite materials are effective and have a 0-day PHI.

Additionally, mummy berry and Alternaria have been observed during scouting. The increased incidence of Alternaria is most likely associated with fruit injury caused by mechanical harvesting.

For fungicide recommendations, refer to the Rutgers Blueberry Commercial Production Guide or  https://extension.rutgers.edu/sites/default/files/2026-03/bb-v42n01.pdf

% Mummy Berry Infested Fruit % Anthracnose Infested Fruit % Alternaria Infested Fruit
Avg High Avg High Avg High
6/20 0.03 0.9 0.06 2.5 0.004 0.7
6/27 0.007 0.3 0.08 2.2 0.07 3
7/3 0.005 0.2 0.227 4.1 0.07 1.2

Grapes
Insects

Grape Berry Moth (GBM): Second generation adult GBM continue to be captured in pheromone traps and larval activity in bunches has been observed. The degree day timing to treat the second generation has passed. Second generation grape berry moth is not an automatic pest problem in New Jersey vineyards. The need for control is determined by examining bunches for larval activity, beginning in early‐July. An insecticide application is warranted when 5% of the bunches display larval feeding signs.

Japanese beetle: Japanese beetles are present in vineyards feeding on foliage. While established vines can tolerate some foliar injury, young or stressed vines are more susceptible to damage. If damage is severe, Assail, Baythroid, Belay, Danitol, or Sevin should provide the necessary control.

Spotted lanternfly: Population levels have been variable across the state, with average counts of nymphs remaining low compared to previous years. Fourth instars have been recently observed.

Diseases

Reports of disease incidence of downy mildew, powdery mildew, black rot, Botrytis bunch rot, and ripe rot have been minimal. Recommended materials can be found in the New Jersey Commercial Grape Production Guide.

Filed Under: Blueberry, Fruit, Tree Fruit, Uncategorized, Wine Grape Tagged With: , , , , , , , , , , , , , , , , , , , , , ,
July 1, 2026 , , and

Fruit IPM Report for Week of 6/22/2026

 

Apples
Disease Management Considerations

Apple scab, cedar apple rust, and powdery mildew: Few apple scab lesions have been found in orchards throughout the state. Cedar apple rust has been reported on leaves and fruit at several orchards throughout the state (Figure 1).

Cedar apple rust lesions forming on apple leaves.

Figure 1. Cedar apple rust lesions forming on apple leaves.

Powdery mildew is present in some orchards and needs to be managed through July (Figure 2). If you see apple scab lesions on your cluster leaves, products such as Merivon, Luna Sensation, Prophyt, or Inspire Super can be applied to burn them out. These products also work well on powdery mildew. In periods of hot days with high humidity and no rain, sulfur (e.g., Microthiol Disperss at 10 lb./A) can be applied.

Powdery mildew on apple leaves.

Figure 2. Powdery mildew on apple leaves.

Fire blight: Where shoot blight symptoms are present, it is appropriate to prune out infected shoots. Do not cut out infections during wet weather, as bacteria can spread through water. The recommendation is to cut back to last year’s growth, at least 12” back into healthy tissue, and to sterilize pruners between cuttings.

Bitter rot on developing fruit.

Figure 3. Bitter rot on developing fruit.

 

Rots: Hot, humid weather will increase the risk of fruit rots, including white rot, bitter rot, black rot, sooty blotch & flyspeck. Bitter rot has been observed in southern county orchards (Figure 3).

Broad-spectrum fungicides, such as captan and ziram, are effective, and adding single-site products such as Merivon, Luna Sensation, Pristine, Omega, and Aprovia may improve control. The addition of phosphonate products such as ProPhyt or Rampart to captan sprays can improve control of rots and other summer diseases, including sooty blotch and flyspeck. It may help suppress scab infections when present.

Marssonina Blotch, Glomerella Leaf Spot, and Frogeye Leaf Spot: Maintain coverage of captan, manzate, or ziram before rain events through the growing season according to the cover spray rule of applications every 2” of rain or 14 days, whichever comes first.

Insect Update

Codling Moth (CM): Biofix has been set for southern counties as of April 20 and in northern counties as of May 5. Injury from the first generation has been reported in southern orchards (Figure 4). Second-generation timings are updated below. Consider management if >5 months/trap.

Codling Moth Degree Day Timing – Second Generation
Application and Insecticide Type
County Area Biofix Rimon:

75-100DD + 14-17 days later

 

 Intrepid

1150 + 1450 DD

Diamides – Altacor, Voliam mixes: (150-200 DD)

 Madex

1250 DD + every 7-9 days during brood hatch (later if first spray is an IGR)

 Standard Insecticides –  Delegate, Avaunt, OP’s, carbamates, pyrethroids

1250 DD + 1550 DD

 
DD 1150 1450 1250 1250 1550
Southern April 20 N/A N/A 6/30 7/8 7/2 7/2 7/11
Northern  May 5 N/A N/A 7/3 7/10 7/5 7/5 7/13
Codling moth injury and larva in developing fruit.

Figure 4. Codling moth injury and larva in developing fruit.

 

Scale: Crawler emergence continues and has increased in some orchards. Control options during crawler emergence include Neonicotinoids (suppression only), Sivanto, Esteem, and Centaur. See also the scale discussion under the peach section.

Woolly Apple Aphid (WAA); Green Apple (Spirea) Aphids (GAA): Populations continue to build in some orchards statewide, but on average remain below treatment levels. A treatment threshold is set at 50% of the terminals infested with live colonies. Predation by lady beetles and other predators has been observed and can help to maintain pest populations below damaging thresholds. As the terminals stop growing and harden, aphid populations should decrease. Movento will control WAA and GAA and can suppress scale when crawlers are active.

Potato leafhopper (PLH): Adults and nymphs are present and increasing in apple orchards throughout the state. Feeding damage from PLH results in “hopperburn” symptoms, which include browning & necrosis along leaf margins, along with leaf curling and stunting (Figure 5).

Potato leafhopper injury in new apple shoots.

Figure 5. Potato leafhopper injury in new apple shoots. 

Consider treatment, particularly on young, non-bearing fruit trees. The preferred materials for leafhopper control include Actara, Admire, Assail, Belay, Endigo, and Voliam Flexi.

Ambrosia Beetle: Trap captures continue to increase in some orchards, while other orchards, particularly in the south, have had a decrease in trap captures. Monitor signs of stress or infested trees with “toothpicks” from boring activity and consider trunk sprays if needed.

Dogwood borer: We continue to capture a high number of males in pheromone traps across orchards statewide. Mating disruption is recommended and effective for this pest and should be considered for next season in blocks with a history of infestation. Assail has demonstrated activity when targeting adults to reduce egg laying. See the 2026 Integrated Orchard Management Guide for Commercial Apples in the Southeast.

Traps

Average Trap Captures in Apple – Southern Counties

  Week STLM TABM CM OFM DWB AMBROSIA BEETLE BMSB
5/11/2026 18  11  6 3   25   2 –
5/18/2026 16 21 3 10   54 13 –
5/25/2026 1.3 23 2 2   71 7 –
6/1/2026 378 33 3 2   49 6 0.4
6/8/2026 258 11 2 1   61 21 1.2
6/15/2026 355 4 0.6 1.5   57 13 0.8
6/22/2026 178 5 0.6 2   54 8 1.2

 

Average Trap Captures in Apple – Northern Counties

  Week STLM TABM CM DWB AMBROSIA BEETLE BMSB
5/11/2026 13.7 1.5 1.8 12.8 1.1 –
5/18/2026 8.3 13.25 2.4 18.5 10.8 –
5/25/2026 2.2 13.75 1.2 24.5 5.1 –
6/1/2026 25.1 24.3 3.4 23.8 9.4 0.3
6/8/2026  94 22.3 0.3 24.6  18 1.4
6/15/2026 68 22.3 1 22.6 14 1.1
6/22/2026 105.9 35 0.7 27.2 8.2 0.5

 

Pears
Disease Management

Foliar diseases should be managed with Mancozeb or Ziram, plus a single-site fungicide, to maintain pressure and inoculum at low levels, protecting fruit and maintaining a healthy orchard going into the next season. See the New Jersey Commercial Tree Fruit Production Guide for more information.

Where fire blight is present, it is appropriate to prune out infected shoots. Prune out strikes on dry, cooler days, cut back 8-12” back into healthy tissue, and sterilize pruners between cuts.

Insect Update

Pear psylla: Where psylla adults are still being found, options for control include Actara, Assail, and Belay (IRAC group 4A); Sivanto Prime (IRAC group 4D); Delegate (IRAC Group 5); and products containing abamectin (IRAC group 6). Other options include Movento (IRAC Group 23). The addition of 0.25-1 gal of summer oil may improve control. Avoid applying oil at high temperatures, and do not mix with captan. Be sure to read and follow the label instructions for adding penetrants to products.

Peaches
Disease Management

Bacterial spot: This disease is still present in some orchards and can be found on developing fruit (Figure 6).

Bacterial spot on developing peach fruit.

Figure 6. Bacterial spot on developing peach fruit.

Peach scab: Maintain good coverage with captan or other effective fungicides until July in orchards where scab was previously an issue.

Brown Rot: Most growers should rely on a captan-based program for mid-season covers, followed by better materials during the last 3 weeks pre-harvest when fruit is present. See the NJ Commercial Tree Fruit Production Guide for more information.

Insect Update

Oriental Fruit Moth (OFM): A biofix point for OFM was set on 4/7 for southern counties and 4/15 in northern counties. Treatment timings targeting the second generation are shown in the table below.

OFM 2nd Generation Timing
Insecticide Type
County/Region Degree Days by 6/29 base 45 Conventional

1150-1200

1450-1500

 Intrepid/Rimon

1050-1150

1300-1400

 Diamides/Virus

1075-1150

1375-1450
Gloucester – Southern 1258 1st –past

2nd – past

 1st –past

2nd – past

 1st –past

2nd – past
Middlesex – Northern 1363 1st – past

2nd – 7/2-7/3

 1st – past

2nd – 6/27-7/1

 1st – past

2nd – 6/29-7/2

Japanese Beetles: Japanese beetles have been observed feeding in orchards. Products containing imidacloprid (Admire Pro, Leverage 360) are effective and have a short preharvest interval.

Scale: Crawler emergence is active in orchards across the state. If crawlers are present, treatment options include Movento, Esteem, Centaur, Sivanto, and neonicotinoids (for suppression only). Movento, Esteem, and Centaur should be applied at the start of crawler emergence.

Thrips: We continue to observe moderate thrips activity in orchards throughout the state. Delegate or Entrust at the highest labeled rate are the usual recommended materials for thrips present in stone fruit. Lannate also has activity on thrips. These materials all have short PHI’s and may be applied close to harvest where injury is observed.

Tarnished plant bugs and other catfacing insects: Insects are active, but new fruit feeding injury has been minimal.

Lesser and Greater Peach Tree Borers: We continue to trap high numbers of both species. If this has been a historical pest in your orchard, mating disruption is recommended. Continue monitoring and managing as usual in problem blocks with mating disruption or trunk sprays.

Traps

Average Trap Captures in Peach – Southern Counties

  Week OFM TABM LPTB PTB BMSB
5/11/2026 5 10 – – –
5/18/2026 4 20 – – –
5/25/2026 2 20 31 1 –
6/1/2026 4 46 28 3 0
6/8/2026 8 13 25 3 0.75
6/15/2026 5 6 13 3 0.75
6/22/2026 6 4 23 7 1

 

Average Trap Captures in Peach – Northern Counties

  Week OFM LPTB PTB
5/11/2026 4.4 24 0
5/18/2026 2.4 16.5 0.2
5/25/2026 0.7 8.75 0.1
6/1/2026 1.8 11 0.5
6/8/2026  0.6  8.5  0.05
6/15/2026 3.5 9.7 1.2
6/22/2026 3.4 7.4 1.6

 

Blueberries
Insect Update

Scouting was conducted last week across 180 commercial and organic blueberry fields in Burlington and Atlantic Counties. Field evaluations focused primarily on inspecting fruit for insect injury and assessing aphid infestations on new vegetative terminals. Aphid populations increased compared with the previous week, although average colony sizes remain low, with approximately 1–5 aphids per infested shoot (Table 1).

Table 1: Aphid Infestation on New Terminals

Aphids % Terminal Infestation
Avg High
5/23 1.5 A 14
5/29 2.83 A 38
6/6 2.189 A 30
6/12 1.9 A 26
6/20 2.9 A 54
6/27 3.07 A 56
Aphid Colony Size: A: 1-5, B: 6-10, C: 11-15, D: >16

 

Trap Monitoring

Although spotted-wing drosophila trap captures remain low compared to previous years, SWD remains the primary target for insecticide applications at this time (Table 2). For management recommendations for SWD in blueberry and other berry crops, reference Rutgers Cooperative Extension Factsheet FS1246 and SWD Insecticides for Berries.

Table 2. Spotted-Wing Drosophila and Blueberry Maggot Traps

Spotted-Wing Drosophila Blueberry Maggot
Atlantic County Burlington County Atlantic County Burlington County
Avg High Avg High Avg High Avg High
6/6 8.99 35 2.86 7 0.03 1 0 0
6/12 9.9 46 3.7 25 0 0 0 0
6/20 10.24 48 8.22 35 0 0 0 0
6/27 6.96 78 3.6 18 0 0 0 0

Table 3. Sharp-nosed Leafhopper and Oriental Beetle Traps

Sharp-nosed Leafhopper Oriental Beetle
Atlantic County Burlington County Atlantic County Burlington County
Avg High Avg High Avg High Avg High
6/6 1.42 16 1.25 7 5.78 35 2.57 14
6/12 0.56 12 4.8 46 62 340 47 170
6/20 0.88 6 1.44 12 411 2025 403 2025
6/27 0.77 9 0.37 2 243 2025 458 2025

 

Scale: We continue to monitor scale crawler activity for both terrapin scale and Putnam scale. We observed a decline in crawler activity (Table 4) and scale infestations on fruit (Table 5).

Table 4. Scale Traps

Putnam Terrapin
Avg High Avg High
5/23 36.85 230 1.8 8
5/29 65.17 352 21.2 41
6/6 136.25 402 75.25 84
6/12 164 639 96 202
6/20 102 288 85 167
6/27 45 193 32 119

Table 5. Scale infestation on fruit

Scale % infestation on fruit
Avg High
6/12 0.13 2.1
6/20 0.19 5.7
6/27 0.06 1.5
Diseases

The IPM team has observed anthracnose on ‘Duke’ blueberries, as well as mummy berry and Alternaria fruit rot. Alternaria incidence can increase due to injuries from mechanical harvesting, which create entry points for infection.

% Mummy Berry Infested Fruit % Anthracnose Infested Fruit % Alternaria Infested Fruit
Avg High Avg High Avg High
6/20 0.03 0.9 0.06 2.5 0.004 0.7
6/27 0.007 0.3 0.08 2.2 0.07 3

For blueberry production and management recommendations, please reference the recently revised 2026 Commercial Blueberry Pest Control Recommendations for New Jersey.

Grapes
Insects

We continue to capture Grape berry moth in pheromone traps, which have slightly increased in number, indicating adults are actively in flight. Applications for GBM using Intrepid or Diamides should be made at 810 DD base 47°F from wild grape or native grape varieties (Concords were at trace bloom on 5/19 in southern counties). Other effective materials can be applied a few days later. We are past the projected treatment window as predicted by the NEWA Grape Berry Moth model; however, you can monitor bunches to determine if further treatment is needed. Check especially on edge rows near the woods. If 5% of clusters show damage, then treatment is justified.

Japanese beetle pressure is increasing in vineyards throughout the state. Vines with well-developed canopies can withstand some Japanese beetle pressure, but where vines are stressed and vigor is reduced, see the NJ Commercial Grape Production Guide for more information on insecticides effective against this pest.

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