Peach:

Oriental Fruit Moth: First generation timings are updated below: Growers that have utilized mating disruption for OFM can focus on PC; GPA; and catfacing insect pests as described below. If you have not placed mating disruption dispensers yet they can still be deployed for later generations, but this generation must be treated with insecticides at the first generation timings.

 

OFM 1st Generation Timing
		Insecticide Type
County/Region	Degree Days by  5/10 base 45	Conventional 170-200, 350-375	Diamide 100-150, 300-350
Gloucester – Southern	384	1st – past 2nd – past	1st – past 2nd – past
Hunterdon – Northern	307	1st – past 2nd – May 14-15	1st – past 2nd – May 9-12

 

Plum Curculio (PC): PC activity usually peaks about mid-May and may linger into early June. Preferred materials that offer PC control now are Avaunt, and Imidan. If using high rates of a neonicotinoid (i.e. Actara, Belay, Assail), be aware that there is a synergistic effect when used in tank mixes with DMI materials (i.e. Rally) with regard to bee toxicity. Neonicotinoids should not be used if there are any flowering weeds in your orchard. Those flowering weeds will attract bees, which will be killed by the insecticide. The use of most of these products when bees are present is off label and therefore not legal. If pyrethroids are being used, then high rates are advisable, since low rates often do not control PC, especially in hot weather. Where PC is a problem, growers should rotate away from pyrethroid insecticides if possible. Actara and Belay will also control PC (and GPA), but not OFM.

Green Peach Aphids (GPA): Green Peach Aphid: GPA colonies remain at very low levels in southern counties, and are well below treatment thresholds. If aphids are at treatment level, you have and your ground cover is clean of blooming weeds, a good choice that will cover catfacing insects, aphids, and plum curculio is Thiamethoxam (Actara and in VoliamFlexi). Actara will not control OFM. Examine trees for the presence of colonies by standing back and looking at the entire tree. Clusters of curled leaves will define a single colony. Count the number of colonies on ten trees and use a treatment threshold of 2 colonies/tree at petal fall to shuck split for peach, and 1 colony/tree for nectarine. If treating aphids alone then Movento @ 6 oz/A is a good non-neonicotinoid choice. Movento must be combined with a spreader/penetrant spray adjuvant. Used later during late May to early June this will also control scale. Movento will not control PC or catfacing insects. Lannate can also be used, but is not quite as effective and is a weak PC material. To date no aphids have been observed in southern county orchards.

Tarnished Plant Bugs and Other Catfacing Insects:  This is the other key insect complex at this time of year. Stink bugs have been found at low levels in beating tray samples. Tarnished plant bugs will become more of an issue as temperatures warm and mowing and other ground cover activities become more common. General spray timing at this time of year should still be targeted for Oriental Fruit Moth and/or Plum Curculio (PC). Most materials, except the diamides (Altacor, Belt, Tourismo) used for these pests will have some efficacy for plant bugs.

Lesser Peach Tree Borer and Peach Tree Borer: Growers that wish to use mating disruption for borer control should place them in the orchard before the lesser borer flight begins, which should be sometime very soon. 

Bacterial Spot: Maintain tight covers with antibiotics until pit hardening. Typical antibiotics used include various copper and oxytetracyclene formulations. Full covers with at least 100 gpa are recommended around wetting periods or severe weather. No bacterial spot cankers or leaf symptoms have been observed in southern county orchards as of yet.

Peach Scab: In addition to Rusty Spot and Bacterial Spot, peach scab requires protective applications starting at petal fall. Peach scab cankers begin to expand at bloom and by shuck split begin to shed spores during wetting periods. Topsin, Topsin/Captan combinations, Flint Extra, Inspire Super, and especially Quadris Top applied at petal fall are the best materials for blocks that had scab last year. Quadris Top, Flint Extra and Topsin should be used at the high rate to suppress overwintering lesions on the wood. Quadris Top contains azoxystrobin which is phytotoxic to many apple varieties. Phytotoxic residues can remain in the tank for long periods after an application is made, even if a tank cleaner is used. Do not use Quadris Top or Abound in the same sprayer used for apples. Bravo (chlorothalonil) is also a good protectant that may be applied no later than shuck split. Captan is also helpful in cover sprays after shuck split where scab was troublesome last year.

Rusty Spot: Rusty spot infections are ongoing until pit hardening. If you are using Flint Extra, Inspire Super, or Quadris Top for scab, these materials will also control rusty spot. After petal fall, maintain coverage with effective materials such as Rally, Rhyme, or potassium bicarbonate products.

Apple:

Codling Moth (CM): Biofixes for Codling moth have been set. See the chart below. Timings for codling moth treatments by chemistry are listed below.

 

	Codling Moth Degree Day Timing
		Application and Insecticide Type
County Area	Biofix	Rimon: 75-100DD + 14-17 days later		Intrepid 150 + 450 DD Diamides – Altacor, Voliam mixes: (150-200 DD) + 14-21 days later		Cyd-X, Carpovirusine 250 DD + every 7-9 days during brood hatch (later if first spray is an IGR)	Standard Insecticides –  Delegate, Avaunt, OP’s, carbamates, pyrethroids 250 DD + 550 DD
DD		75	100	150	450	250	250	550
Southern	May 2	May 6	May 13	May 16	Too far off	Too far off	Too far off	Too far off
Northern	April 28	May 4	May 8	May 17	Too far off	Too far off	Too far off	Too far off

European Apple Sawfly (EAS): This insect is active through bloom and into petal fall and first cover. Adult females lay eggs just under the skin of freshly set fruit, and the young larvae mine just under the skin. Where this insect is active, it is a primary target at petal fall. In orchards of mixed variety plantings, the petal fall spray for the entire planting is prolonged. This enables EAS to start damaging the first varieties where petals fell earlier before a petal fall spray could be applied to the entire block.

Tufted Apple Budmoth (TABM): A biofix was set statewide on May 3. Predictions for insecticides timings are too far out at this time. More on this in later reports.

Diseases: Apple Scab, Powdery Mildew, Cedar Apple Rust, are diseases of concern at this time. The NEWA scab models are predicting about 100% ascospore maturity during this period in southern NJ. Primary apple scab spores are released during any substantial wetting and infection period, and since all ascospores are predicted to be mature primary scab season is nearing the end in southern counties. Growers should continue to manage for primary scab through May since microclimates may affect spore maturity and because it has been dry the next significant wetting may still result in a primary scab infection. Ascopore maturity will be slightly less in northern counties. Cedar apple rust infections can occur anytime between pink and 3^rd cover.

Fire Blight: Continue rotations of Streptomycin, Mycoshield or Firewall through 1^st cover for shoot blight. If using apogee or Kudos for shoot blight suppression follow label instructions.

Grapes:

Diseases: Grape diseases active at this growth stage are phomopsis, powdery mildew and black rot. Disease infection periods can be monitored using the NEWA models. Choose the weather station closest to your vineyard.

Insects: At this growth stage monitor for climbing cutworms and grape flea beetle. Both of these are considered minor pests. Leafhoppers have been seen in a few spots. This complex is generally not of concern. Potato leafhoppers, which arrive sometime in June, can cause some minor damage.

Scouting Calendar Tree Fruit Southern Counties

The following table is intended as an aid for orchard scouting. I t should not be used to time pesticide applications. Median dates for pest events and crop phenology are displayed. These dates are compiled from observations made since 1995 in Gloucester County. Events in northern New Jersey should occur 7-10 days later.

 

Pest Event or Growth Stage	Approximate Date	2019 Observed Date
Bud Swell (Redhaven)	March 23 +/- 15 Days	March 29
1/4″ Green Tip Red Delicious	March 31 +/- 13 Days	March 27
Pink Peach (Redhaven)	April 4 +/- 15 Days	April 4
Tight Cluster Red Delicious	April 9 +/- 13 Days	April 6
Oriental Fruit Moth Biofix	April 9 +/- 13 Days	April 8
Full Bloom Peach (Redhaven)	April 9 +/- 14 Days	April 10
Pink Apple (Red Delicious)	April 14 +/- 12 Days	April 11
Codling Moth Biofix	April 27 +/- 13 Days	May 2
Green Peach Aphid Observed	April 16 +/- 16 Days	April 26
Full Bloom Apple (Red Delicious)	April 22 +/- 11 Days	April 20
Petal Fall (Redhaven)	April 22 +/- 10 Days	April 24
Petal Fall (Red Delicious)	April 27 +/- 14 Days	May 7
Shuck Split (Redhaven)	April 30+/- 11 Days	April 29
First PC Oviposition Scars Observed	May 3 +/- 18 Days	April 29
Tufted Apple Bud Moth Biofix	May 4 +/- 10 Days	May 3
San Jose Scale Crawlers	June 2 +/- 8 Days	Not yet observed
White Peach Scale Crawlers	May 26 +/- 11 days	Not yet observed
Pit Hardening Peach	June 16 +/- 8 Days	Not yet observed

 

 

 

 

 

 

 

Tree  Fruit Trap Counts – Southern Counties

 

Weekending	STLM	TABM-A	CM	AM	OFM-A	DWB	OFM-P	TABM-P	LPTB	PTB
4/17/21	7		0		8		1
4/24/21	12		0		34		2
5/1/21	7		0		11		1	0	0