Abstract
Development of resistance in the filbert aphid, Myzocallis Corly (Goetze), to commonly used insecticides was investigated. Data suggest that M. coryli populations have become resistant to many insecticides. Resistance to endosulfan, carbaryl, diazinon, phosalone, and oxydemetonmethyl was detected. Resistance levels varied from 1.5- to 4,090-fold for carbaryl, 1.2- to 288-fold for diazinon, 1.8- to 50-fold against endosulfan, 1.7- to 49,069-fold against phosalone, and 3.4- to 112.4-fold against oxydemetonmethyl. Some seasonal variations were noticed. With some exceptions, summer and fall populations were generally more resistant to pesticides than the spring populations. Although development of resistance on a regional basis was not evident, a more localized (orchard by orchard) resistance was observed. This pattern suggests limited aphid movement and gene flow.
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