Japanese Beetle Grubs: Dosage-Mortality Response and Symptoms of Poisoning Following Topical Treatments with Chlorpyrifos and Dieldrin

Authors: Ahmad, Sami; Das, Yesu T.

Source: Journal of Economic Entomology, Volume 71, Number 6, December 1978 , pp. 939-942(4)

Publisher: Entomological Society of America

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Dosage-mortality response, toxicological symptoms, and events leading to death following topical treatment of 3rd stage grubs of a New Jersey population of Popillia japonica Newman were studied. The 8-day LD50 and LD95 values for chlorpyrifos were 1.88 and 55.24 g/grub, respectively. For the slower-acting dieldrin, the 14-day LD50 and LD95 were 48.7 and 1768 g/grub, respectively; the high LD50 for dieldrin may be indicative of dieldrin resistance. Grubs in advanced stages of insecticide poisoning were characterized by distinct symptoms: shrinkage in size and reduction in body weight to ca. 50%; yellow-brown coloration of the body, instead of the normal whitish appearance; and moribundity. Preceding the onset of the advanced stage of poisoning, the treated grubs became hyperactive (locomotor excitability) and moved up to the soil surface, remained there for one or more days, progressed to the advanced stage of poisoning, and died. Some surfaced grubs, apparently recovering from insecticide action, dug back into the soil after a day or two.

Document Type: Research Article

Publication date: December 1, 1978

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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