Caseload at the UW Insect Diagnostic Lab (IDL) has been very high over the course of July. Recent cases at the UW Insect Diagnostic Lab involving insects relevant to fruit crops are summarized below. Keep in mind that this report does not represent all fruit crop activity in Wisconsin, rather it reflects samples and cases submitted to the IDL—scouting your own crops is a key IPM practice!
| Pest | Scientific Name | WI Region* | Crop | Notes |
|---|---|---|---|---|
| Apple maggot | Rhagoletis pomonella | SC, SE | Apple | Damage to fruits |
| Apple-and-thorn Skeletonizer | Choreutis pariana | EC | Apple | Skeletonization of leaves; frass |
| Asiatic garden beetle | Maladera formosae | SC | Apple | Holes/notches in leaves; minor damage |
| Cherry webspinning sawfly | Neurotoma edwardi | SC | Cherry | Webbing and gregarious larval feeding |
| Elderberry Borer | Desmocerus palliatus | NC | Elderberry | Adult activity |
| Fall webworm | Hyphantria cunea | SC | Apple | Small webs and caterpillars present. |
| Grapevine Beetle | Pelidnota punctata | SE | Apple | Adult found dead under apple tree |
| Japanese beetles | Popillia japonica | SC, SE, EC, NE, NC, WC, C | Apples, plums, grapes | Skeletonization of foliage |
| Pearslug sawfly | Caliroa cerasi | SC, SE | Aronia, Pear | Skeletonization of foliage |
| Plum Curculio | Conotrachelus nenuphar | SC, SE, WC, C | Apple, plum, cherry | Scars on fruit |
| Spider mites | Tetranychidae | SC, SW, WC, NC, | Strawberries, Blueberries, Apple | Stippling damage to foliage |
| Spotted wing Drosophila | Drosophila suzukii | SC, SE, EC, WC | Raspberries, cherries | Larval infestations of fruit |
*Wisconsin Regions used in Insect Summary Table
Reminder about free diagnostic support from the UW Insect Diagnostic Lab: Growers and consultants in need of insect diagnostic services are always welcome to submit samples to the UW Insect Diagnostic Lab.
Lab services are provided free of charge.
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