ST. PAUL — Field sampling for invasive insects and pathogens in fruits and vegetables are mostly completed for the year with the exception of monitoring for brown marmorated stink bug which will continue into the fall.
The most significant find this year was the detection of Swede midge, as well as apparent damage, at a few sites in Ramsey County. In addition, many trap samples remain to be screened for Swede midge and we anticipate that more sites with positive traps will be found. Swede midge was found for the first time in Minnesota during 2016.
Another crucifer problem found at multiple sites during 2016 was the disease clubroot which is caused by Plasmodiophora brasicae. This pathogen was found on a variety of crops including mustard, bok choy, broccoli, kohlrabi and cabbage at sites in Maplewood, St Paul, Duluth and Rochester.
A wide variety of insects and pathogens are monitored as part of this project, called the “Pathways Survey” because it targets urban areas as pathways for movement of invasive species (see map below for sites monitored during 2017). Read more about this project at the MDA website.
— Minnesota Department of Agriculture
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