Fruit IPM For 7/28/21

Peach:

Oriental Fruit Moth: The timing for third brood control is outlined below. In general, most populations are low and not causing problems.

Brown Rot: See last week’s newsletter and the 2021 Tree Fruit Production Guide. Also from the previous newsletter: About 10 weeks before anticipated harvest begins, use captan at 3 1/8 pounds per acre in cover sprays; at 3 weeks prior to harvest use Flint Extra at 3.8 ounces acre; and then follow the usual preharvest schedule with Fontelis at 16-20 ounces 2 weeks before harvest and Inspire Super or a propiconazole product at 1-4 days before harvest. In addition, Rhizopus rot was noted on drops in some orchards. This disease may become troublesome if conditions remain wet.

San Jose Scale (SJS): Some damage is being seen from 1^st generation crawlers in northern county orchards where nymphs are active. Black sticky tape traps set up on one farm in Sussex County continue to show active crawlers (nymphs). Now is the time to the nymphal stage if you have problem populations. In southern counties the second generation crawler emergence is active. Treatments for this generation should be made the first or second week of August in southern counties. High volume applications are required for control since all twigs and surface areas where nymphs are active need to be covered. Esteem, Centaur, Venerate and Diazinon are choices for control.

Apple:

San Jose Scale (SJS): See peach section above.

Brown Marmorated Stink Bugs (BMSB): Adults and nymphs are now moving into orchards from alternate hosts and habitats. Trap captures remain low, but may increase over the next 4-6 weeks.

Codling Moth (CM): On average, trap captures are low, but we have seen some increases, especially in some southern locations.  If you have already treated, and the moth count exceeds 5 males per trap, then an additional insecticide may be needed.

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.

Tree  Fruit Trap Counts – Southern Counties

Tree  Fruit Trap Counts – Northern Counties

Grapes:

Grape Root Borer: This is a sporadic pest in NJ, and little activity has been seen so far this year. Bucket traps have just started to catch adult moths, but most of these are likely from wild grapes in surrounding woodlands. Most commercial vineyards have no known grape root borer problems, and usually treatments are not needed. The only way to assess a problem is to carefully look for empty pupal cases at the base on the vines. This is much easier with good weed control, so the soil is clear around the vine base. Take several counts of at least 70 vines per field. Treatment is justified if pupal cases are found at 5% or more of the vines.

Blueberries:           

Blueberry Maggot (BBM): No blueberry maggot adults were found over the past week. SWD remains the main insect of concern.

Spotted Wing Drosophila (SWD): We are now left with only the latest varieties. Given that adult populations continue to provide significant pressure, a tight control program is still needed on anything that has yet to be picked. Average trap captures have continued to increase, and maximum captures of male flies are over 250/trap. Make sure to rotate insecticide types, or use different products with different IRAC mode of action classifications. As the adults continue to mate and lay eggs, higher populations of larvae will be present in dropped fruit and ultimately ripening fruit if not adequately covered. Make sure to target the bottom half of the bush as well as berries dropped on the ground, in addition to the tops of the plants. Adult flies are the most active during the early morning hours and at dusk. Therefore, applications of insecticide during the very early morning hours and twilight will be more effective than if applied during late morning to mid-day.

Aphids:  Aphids are still being found but are much lower than seen in previous weeks. However, some farms still have issues with aphid control, with a high of 10% of new terminals infested.

By the Numbers Summary: