NABREW: Exo and SWD Info Nuggets

The 2014 North American Blueberry Research and Extension Workers (NABREW) conference was held in Atlantic City, New Jersey.  This conference is held every 4 years and this was the first one I attended.  It was highly informative with great presentations on blueberry viruses, genetics and genomics, insect pests, blueberry culture, blueberry pollinators, blueberry breeding, history, weed management, phenology prediction, fungal pests, and Extension.  I was very interested in the sections on pest management because of the issues we are having with Spotted Wing Drosophila (SWD) and Exobasidium.  Luckily, some of the national experts on these pests were in attendance.  Below are some nuggets of information I gleaned from the presentations:

SWD

-Crop losses have been variable in North Carolina, with 2% reported in 2013 and most occurring during Rabbiteye season

-Georgia reported 15% loss in 2012

-Fly captures within a field are not necessarily indicative of fruit infestation

-Sprays need to be applied frequently, probably in less than 7 day intervals

-Other pests like scale and whiteflies are becoming more of a problem due to the sprays used to control SWD

-Pyganic (organic spray) has not been effective in New Jersey or other states

-Entrust (organic spray) is effective

-Weed barrier fabric has been shown to suppress populations in Florida vs. pine bark mulch

-SWD comes in from wild hosts like blackberry and dewberry

-Trap bait with Yeast + Sugar + Water is effective but needs to be changed every week

-SWD prefers raspberry and strawberry to blueberry

-After a rain event, Mustang Max still had some activity, but Malathion not much

-Delegate and Mustang Max may kill eggs and larvae (especially young larvae) within 2 days of application based on research from Michigan

EXOBASIDIUM

-Leaf infections worse in lower part of bush and fruit infections worse in interior of bush

-Disease does not appear to be systemic

-Disease prefers areas with high humidity and poor air circulation

-A single lime sulfur spray at 1 week before green tip was very effective in controlling the disease in Georgia

-Early season applications (begin late February) of Captan and Indar worked well too, but more applications needed

-Resistance to Pristine has been seen in Georgia

 

The NABREW attendees in New Jersey at the P.E. Marucci Center for Blueberry & Cranberry Research & Extension in Chatsworth.

The NABREW attendees in New Jersey at the P.E. Marucci Center for Blueberry & Cranberry Research & Extension in Chatsworth.

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