Abstract
A dieldrin-resistant field strain of Anopheles quadrimaculatus Say from Cleveland, Mississippi, has been established under insectary production. Three-day-old females show high dieldrin resistance; 60-minute exposures to 0.8% through 8% dieldrin- Risella oil papers result in less than 10% mortality in 24 hours, while 480-minute exposures to 4% papers killed only 50%. Susceptible females are killed by 60-minute exposures to 1.6% dieldrin-Risella oil papers.
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