| Home > Pest management > dogwood borer |
| Dogwood borer larvae develop in shallow tunnels in burr knots on dwarfing and semi-dwarfing rootstocks at or below the graft union. Reddish frass on the exterior of the knot indicates the presence of the larvae. Adult emergence begins in mid-June, peaks in early July, and continues until August. |
Larvae are white with brown head capsules (about 16 mm long). Below, a knife points to a larva in a burr. |
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 The adult is a black and yellow clear-wing moth with two thin yellow stripes on the second and fourth abdominal seg-ments. There is a rounded anal tuft on the tip of the abdomen (wingspan is about 16-19 mm). |
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- For more monitoring information and evaluation of available pesticides:
Michigan Fruit Management Guide
- A Practical Guide to Scouting Apple Orchards – a DVD showing how to scout apple orchards.
- MSU Diagnostic Services for assistance in pest identification.
- MSU Fruit Crop Advisory Team Alert newsletters for current pest/crop conditions.
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| This information was developed from A Pocket Guide for IPM Scouting in Michigan Apples by David Epstein, Larry J. Gut and George W. Sundin. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2720). |
