Abstract
Development of resistance to carbaryl in field populations of the filbert aphid, Myzocallis coryli (Goetze), is reported here for the first time. The log dosage mortality curves of three aphid populations with different carbaryl exposure history suggest that resistance was acquired in a relatively short time (4 to 5 years, perhaps sooner), but the degree of resistance increased as insecticide use was prolonged. Aphid populations exposed to carbaryl for 5 years (about nine sprays) required 17 to 22 times more chemicals to obtain mortality similar to that of the susceptible strain. The population exposed to carbaryl for 20 years (45 sprays) required about 78 to 145 times more chemical than did the susceptible strain. Resistant aphids attempted to avoid insecticide residues more vigorously than did the susceptible aphids, suggesting that insecticide avoidance behavior might be involved in this resistance mechanism.
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