Fruit IPM For 7/13/21

Peach:

Oriental Fruit Moth: Some southern county orchards are exceeding the 8 moth per trap threshold this week. This is because trap counts and degree day accumulations indicate the start of the 3^rd generation flight. These adults are starting to mate and lay eggs, which will hatch and produce the next brood. Therefor we are near the third brood insecticide timing. Please see table below:

Thrips: Thrips injury has been noted in highly colored peaches and nectarines in southern counties. Delegate has a short PHI and is effective at the high rate. Lannate may work in some orchards.

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 in drops in some orchards. This disease may become troublesome if conditions remain wet.

Apple:

Codling Moth (CM): On average, trap captures are low, but we have seen an increase as the second flight starts to emerge. Given how this insect can be problematic on some farms, it is very important to hit the second emergence on time. Approximate timings for the initial 2^nd generation treatments are outlined below:

Tufted Apple Budmoth (TABM): Trap counts indicate that this is the end of the first generation flight. No treatments are usually needed during July, even on farms with high populations.

Summer Diseases: Rots are now appearing in susceptible varieties. Bitter rot is of most concern but white rot has also been seen in some varieties. Cover sprays with Captan at 3.5#/acre plus a phosphorus acid product (ProPhyte or similar) may help to suppress further rot infections and will improve sooty blotch and fly speck control. For troublesome blocks where bitter rot is a major concern then a tight summer disease program that incorporates Captan + ProPhyte,  rotated with Merivon or Luna Sensation may improve control. Ziram (76DF) may be used at the full 6 lb/A rate (14 day PHI), and rotated with the previous suggestions. Ferbam may not be available, and is not recommended due to possible fruit marking this late in the season.

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

Blueberries:           

Blueberry Maggot (BBM): Blueberry maggot adults started to sporadically appear in the Hammonton area last week. Counts have been very low, but one site recorded 3 flies per trap. Most trap captures have been from traps placed in Duke fields where spraying had recently stopped.  Still, growers who are exporting to Canada should be covering with a BBM effective insecticide every 7 days. If you are no longer exporting, then your management would focus on SWD.

Aphids:  Aphids are still being found but are a distant secondary consideration at this time.

Spotted Wing Drosophila (SWD): Adult populations continue to provide significant pressure. 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. Stay on a 7 day schedule for any unpicked fruit. Reapplications are necessary if insecticide has been applied, only to be washed off in a thunderstorm. 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.

By the Numbers Summary: