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Green apple aphid nymphs and adults prefer to feed on the underside of leaves on growing shoot tips and stems.
Estimate the average number of aphid-infested leaves on terminals. Generally, an average of 3 to 4 infested leaves is needed before fruit dam-age from honeydew occurs. In young orchards, lower levels of aphid infestation (1-2 leaf
colonies) will inhibit growth of the trees. |
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The winged adult (about 3 mm) has a black head and thorax, and a yellow-green abdomen. Wing-less adults are green with black cornicles, legs and antennal tips. Nymphs are about 1.5 mm long. |
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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). |
