Latent Toxicity in the Mediterranean Fruit Fly and the Melon Fly1

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Abstract
Experiments were conducted to determine whether insecticides other than the chlorinated hydrocarbons caused latent toxicity. The insecticides were applied as soil treatments to larvae of the Mediterranean fruit fly, Ceratitis capitata (Wied.), and the melon fly, Dacus cucurbitae Coq. The chlorinated polycyclic hydrocarbon insecticide shad a high order of latent toxicity. Aldrin, chlordane, dieldrin, endrin, isodrin, Strobane, and lindane exhibited strong properties of latent toxicity to the Mediterranean fruit fly. No latent toxicity to this insect was exhibited by Dilan, malathion, parathion, Pyrenone, or Pyrolan. Isobornyl thiocyanoacetate was practically non-toxic to the larvae. Latent toxicity was shown by aldrin, chlordane, dieldrin, endrin, and isodrin to the melon fly but to a lesser degree than to the Mediterranean fruit fly. Lindane, malathion, and parathion evinced no latent toxicity to the melon fly.

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