Fruit IPM Report 7-9-2015

Peach

Oriental Fruit Moth (OFM): While we are still between flights, trap counts indicate a slight pick up of moth activity for the start of the 3rd flight. The first insecticides will be due by the middle of the month in southern counties and about a week later in northern counties. Time your sprays according to the following table:

 
Brown Rot Some rot has been seen in ripening nectarine blocks and a few peach blocks. Where brown rot is present, this presents very high inoculum levels for disease control of the existing clean fruit, both within the block and in surrounding blocks. If practicable, removal of rotten fruit from the orchard will aid in control in affected blocks, and possibly the edges of adjacent blocks that have not yet begun to ripen. Rotate fungicides and maintain a tight program.

Brown Marmorated Stink Bug (BMSB): Nymphs and adults are present in some peach and apple blocks in both northern and southern counties. Be aware that the diamides (Altacor, Belt), Delegate, the OP’s (Imidan), Intrepid, Rimon, and some other materials that can be used at this time of year do not control BMSB. Make sure to check the Tree Fruit Production Guide for effective materials.

Apple

Tufted Apple Budmoth (TABM): We are between broods in all counties. No treatments should be needed for this pest.

Codling Moth (CM):The 2nd generation flight is underway in southern counties, with the first sprays due over the 4th of July holidays. The second application will be due in southern counties between 7/12-15, depending on the insecticide used. Intrepid and Rimon should be used early, while all other materials can be applied around 7/14 in southern counties. The first applications in northern counties are due around 7/10 if using Intrepid/Rimon, but between 7/14-15 for other materials.

Woolly Apple Aphid: Wooly aphids continue to appear in some blocks in southern and northern counties. We have had significant biological control in past years so it’s worth waiting to treat. When scouting examine the colonies by gently removing the “wool” and look to see if aphids are alive or dead. Beneficials that we have observed feeding on woolly aphids are syrphid fly larvae, and parasitic wasps. We have no established threshold for treatment, however an average of 10 colonies per tree would be conservative. Effective materials include Diazinon, AdmirePro applied through drip irrigation, and Movento. Foliar applications of neonics such as Admire Pro, Actara and Belay, generally provide good control of shoot infestations but will not control colonies feeding on woody plant parts. Thionex may be used on apples until July 31 of this year, but there is a 20 day REI and a 21 day PHI.

Blueberry

Spotted Wing Drosophila (SWD): Over the past week the average number of male SWD in Atlantic County has increased to 0.5%. Overall, 11 sites in Atlantic county had at least one male in the trap over the past week and 24 males total were in the traps. There were no males captured in Burlington County. Trap monitoring for SWD adult males will continue throughout the remainder of the season. We also started salt testing the berries for presence of larvae. To date no larvae have been found in any of the salt tests in either counties. All growers should continue to follow the 7-day insecticide program for SWD. Insecticides effective against SWD include: Asana, Adjourn, Brigade, Danitol, Exirel, Hero, Imidan, Lannate, Malathion and Delegate. Plan on using Lannate anywhere aphids may still be an issue. Where aphids are not a problem then Danitol would be a good choice if you are exporting to Canada. If you are not exporting to Canada then any pyrethroid will do, and Imidan is fair game. Delegate use should be alternated with other chemistries during the last 2-3 weeks of a program. Malathion still has a 24C label for the high rate as used last year with a 1-day PHI. This means you can use the Malathion 8F at up to 2.5 pt/A or 2.5 lb ai/A. The high rate is what is needed for good SWD control.

Blueberry Maggot (BBM): We continue to find low numbers of BBM on traps in Atlantic County. To date, no BBM have been observed on traps in Burlington County. Treatment options effective against BBM and SWD include: Asana, Adjourn, Brigade, Danitol, Exirel, Hero, Imidan, Lannate, and Malathion. Delegate will suppress BBM, but should not be used when trap counts exceed 1 fly per trap.

Aphids:  Aphid presence was similar to the previous week with 64% of the sampled sites having positive shoot samples with an average of 7% aphids per 50 shoot sample. However, the overall the number of aphids has decreased in the number of sites with over 10% shoot infestation to 18%.

Sharp-nosed Leafhopper (SNLH): Trap counts remained about the same compared to the previous week in both Atlantic and Burlington Counties (see table below). Most aphicides will also control leafhoppers, as will materials that target SWD.

Oriental Beetle (OB): Trap numbers have decreased in Atlantic and Burlington Counties (see table below) indicating peak emergence has already occurred. When making applications, the target is for the OB larvae. Therefore, treatments should be made before the 3rd week in July to ensure efficacy. Mating disruption applied earlier in the season, and the use of AdmirePro/Imidacloprid are the only labeled treatments for OB.

Putnam Scale: We continue to see scale on the fruit at several locations. Second generation crawlers can be treated for at the end of July beginning of August.

Anthracnose: Little disease is being seen in the field, but we are collecting packed pints of Bluecrop to evaluate the effectiveness of the fungicide spray program. Fruit will be evaluated after a 7 day incubation, and percent anthracnose determined.

Tree Fruit Scouting Calendar Southern Counties

The following table is intended as an aid for orchard scouting. It 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 over the past 5-10 years 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

Page coded by Aaron Rabin