Rutgers Cooperative Extension
Seasonal updates on diseases, insects, weeds impacting small fruit (blueberry, cranberry, and wine grape). Fruit Pest Alerts are also available via this category feed.
Subscription is through the general Fruit feed available via EMAIL and RSS.
Oriental Fruit Moth (OFM): We are between 2nd and 3rd generation broods in southern counties, but still treating emerging larvae in northern counties. Growers who have trap counts that are less than 6 moths per trap can skip insecticides that are intended for OFM. If trap counts are higher, then time your sprays according to the following table:
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Grape berry moth is one of the key direct pests of grapes in NJ. Females lay their eggs on the berry and the larvae makes a small entry hole and then feeds inside the berry. Webbing may be observed as the larvae move between berries.
A threshold of 10% webbing has been used in NY grapes.The MSU model predicted degree-day timing for Intrepid or Altacor applications against grape berry moth to be last Thursday in South Jersey (Bridgeton).
Due to the storm and the rains last week, applications may have reduced efficacy or were not able to be applied. If you have a history of grape berry moth pressure, today would be the tail end of timing for conventional materials. These include pyrethroids, like Bifenture or Danitol, or Imidan. Please read the label carefully as Imidan has a long re-entry interval. Also as a reminder, phytoxocitiy has been observed with using “EC” formulations of insecticides, such as Danitol, with Captan.
Oriental Fruit Moth (OFM): Second generation flights are very low in most areas. By all indications this generation should produce much lower pressure than the 1st generation. Any insecticides which are applied now should target this generation. Growers who have trap counts that are less than 6 moths per trap can skip insecticides that are intended for OFM. If trap counts are higher, then time your sprays according to the following table:
[Read more…]
Brown Marmorated Stink Bug (BMSB): Adults are occasionally seen during orchard scouting. Knock down materials will be required for the remainder of the season in orchards with BMSB populations.
Oriental Fruit Moth (OFM): Second generation flights are very low in most areas. By all indications this generation should produce much lower pressure than the 1st generation. Any insecticides which are applied now should target this generation. Growers who have trap counts that are less than 6 moths per trap can skip insecticides that are intended for OFM. If trap counts are higher, then time your sprays according to the following table:
[Read more…]
from NJ Center for Wine Research & Education
Bloom is here and it is a great time to get an accurate assessment of the nutritional status of your grapevines.
What to sample? Soil or leaf petioles.
Soil sampling should be performed before planting and every 3 years, primarily to track the pH. Sample each block as you would for other crops.
The more direct method for determining the nutrient status of the vine is tissue sampling, specifically petiole sampling (Figure 1. Grape leaf blade and detached petiole). Petiole sampling should be performed every 2-3 years in established plantings. You may need to sample annually when establishing the vineyard.
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Bacterial Spot: Leaf symptoms have been seen in only a few locations and only on highly susceptible varieties. Bacterial spot has not been troublesome this spring probably due to mostly dry conditions during petal fall and early covers. Fruit remains highly susceptible until pit hardening so management practices should be continued.
San Jose Scale Crawler (yellow)
Green Peach Aphids (GPA): GPA colonies are present in northern peach orchards at up to 3 colonies per tree and over 1 colony per tree in nectarines. For peaches these levels can be tolerated, but not on nectarines where GPA damage is present on the fruit.
Plum Curculio (PC): PC activity is over in southern counties but still active in northern counties. Fresh eggs were recently deposited on peaches late last week. Activity should not last too much longer, so one additional cover of a PC effective insecticide should be all that is needed.
Tufted Apple Budmoth (TABM): Tufted apple budmoth started to emerge on 5/12 in southern counties and on 5/17 in Hunterdon County. While this insect has not been an issue over the last 6-8 years, locally high levels of moths have been captured in some pheromone traps this past week. TABM is a leafroller that can web a leaf to the surface of the fruit, and feed between the leaf and the fruit. On peaches this damage can lead to unmarketable and rotten fruit. Young larvae may get established in the stem end. When this is the case, the larva can ‘fall’ into the fruit interior in varieties where the flesh easily separates from the pit, or in split pit fruit. Degree day modeling for timing sprays dictates that the first alternate middle treatments should be timed for around 6/1-2 in southern counties, and by about 6/11-12 in Hunterdon County and northern farms. This is for conventional materials, including Delegate, Altacor, Belt and other diamide mixtures. Timings for TABM control are outlined below. If you are a grower who did have TABM damage last year, you are advised to use the timings that follow:
| Conventional, Diamides |
Conventional, Diamides |
Intrepid, Rimon |
Bt | |
| County Area | AM – 4 Alt Mid Sprays | EM – 2 Complete Sprays | EM – 2 Complete Sprays | EM – 2 Complete Sprays |
| Southern | 1st 6/1-2, 2nd 6/6-8 | 1st 6/3-6 | 1st 6/2-8 | 1st 6/6-8 |
| Northern | 1st 6/9-10 | 1st 6/11-14 | 1st 6/10-13 | 1st About 6/14-18 |
