The caseload at the UW Insect Diagnostic Lab (IDL) has decreased slightly over the last two weeks with more moderate weather patterns, but reports of fruit crop insects continue to come into the IDL.  A summary of fruit crop insect activity reported to the UW Insect Diagnostic Lab from mid-to-late August can be found below:

Brown marmorated stink bug: Reports of brown marmorated stink bugs have increased over the last two weeks. The majority of reports to the IDL have come in from south central and southeastern Wisconsin, with additional reports from west-central Wisconsin.  While a few recent cases at the IDL have involved BMSB adults, in many cases, late instar nymphs (juveniles) are being found.  Growers with a history of BMSB in their area should remain on alert for these insects as BMSB can pose threats to developing and maturing fruit.

Japanese beetles: Japanese beetle reports continue to come into the IDL from around the state, although reports have suggested lower than usual activity in some areas.  Regardless, this pest can continue to be active into September, so growers should continue to scout for Japanese beetles in orchards, vineyards, and fields.

Fall Webworm: By now, growers are almost certainly aware of the presence of fall webworms in their orchards.  Nonetheless, this insect and its silken tents continue to be reported from around the state.

Social wasps: As can be expected this time of the year, the activity of yellowjackets and paper wasps has increased substantially over the last two weeks.  These social wasps reach peak colony size in late summer and early fall and will readily scavenge upon compromised fruits leading to additional issues.  Such insects can also pose concerns for workers at the time of harvest.

Tarnished plant bugs: reports to the IDL indicate scattered pockets of high TPB activity in the state.  These insects can be associated with a wide range of crops, ranging from field crops (like alfalfa) to fruit crops.  Growers should keep an eye for the small brownish adults while scouting.

This article was posted in Insects and tagged BMSB, Brown Marmorated Stink Bug, Japanese Beetles, TPB.