[Apple-Crop] SWD attack on intact peaches

[Dean Polk]

Yes -
We had 1 report from a farm in North Jersey, but I could not find any in the fruit. I later picked some ripe Encore on Sept 1 and put them in emergence cages. I let them run a full 14 days. And yes, many SWD females and males emerged. We have never had these in peaches in NJ, and we still don’t – in traditionally sprayed orchards. The difference here is that the one reported incidence in Hunterdon County and the recorded emergence from the Encore came from fruit that had not been sprayed for about 4 weeks (I still have to look up the spray programs). In recent years growers have been using many pyrethroid sprays for BMSB control. This year, given the lower BMSB populations, coupled with the use of mating disruption for OFM, the insecticide use in a number of orchards was much lower. I think what this tells us is that if we get back to a true IPM program for peaches, we have to monitor and treat for SWD, at least for fruit that is intended for table-ripe markets. We  have to look at this as a whole farm practice in that we have to allow for management options if the grower also produces other SWD host crops like blueberries, cherries and caneberries.
****************************************
Dean Polk, Fruit IPM Agent (Professor)
deanpolk at njaes.rutgers.edu
Rutgers Agricultural Research and Extension Center
121 Northville Rd.
Bridgeton, NJ  08302-5919
Cell: (609) 902-1134
Office: (856) 455-3100  ext 4116
Fax: (856) 455-3133




From: apple-crop <apple-crop-bounces at virtualorchard.com<mailto:apple-crop-bounces at virtualorchard.com>> on behalf of Glen Koehler <glen.koehler at maine.edu<mailto:glen.koehler at maine.edu>>
Reply-To: Apple-Crop discussion list <apple-crop at virtualorchard.com<mailto:apple-crop at virtualorchard.com>>
Date: Monday, September 18, 2017 at 1:10 PM
To: Apple-crop LISTSERVER <apple-crop at virtualorchard.com<mailto:apple-crop at virtualorchard.com>>
Subject: [Apple-Crop] SWD attack on intact peaches

Case in Maine that appears to be SWD attack on intact peaches without splits or other prior wounds.  These peaches were ripening on the tree but not over-ripe and no splits etc. for easy drosophila oviposition without having to cut through skin.  Until now it seemed that SWD could only lay eggs in peaches with pre-existing wound.  Have other folks seen SWD infestation of intact peaches?


Glen Koehler
University of Maine Cooperative Extension
Pest Management Office
Voice:  Office 207-581-3882,   Cell  207-485-0918
491 College Avenue, Orono, ME  04473
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