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22,25-Bisdeoxyecdysone: Pathological Effects on the Mexican Bean Beetle1 and Synergism with Juvenile Hormone Compounds2,3

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Abstract:

All 4 instars of Epilachna varieties Mulsant, when confined with bean plants dipped in solutions containing the ecdysteroid 22,25.bisdeoxyecdysone (BDE) , exhibited lethal molting abnormalities. Treated 4th instars molted precociously into dwarf neotenic f01'l11s,often with abnormal wing pad extension. Newly emerged females con fined [or 10 days With beans that had been dipped into a solution containing 100 ppm o[ BDE were sterilized permanently. ovipositing females confined for 7 days Slopped oviposition by the 3rd day and gradually reduced their feeding 10 17% that of the controls 8-10 days after Treatment began.

Several juvenile hormone compounds and insecticide synergists synergized BDE on 4th instars and adult females. Males. When ovipositing females were confined in field cages with beans sprayed once with a mixture of 50 ppm of BDE + 250 ppm each of sesamex and (E) -4.[ (6,7- epoxy.3.ethyl-7 .U\ethyl-2-nonenyl) oxy]- 1.2- (methylenedioxy) benzene, viable egg production did not exceed ]2% that of the controls for any 5-day period during the following 30 days.

Document Type: Research Article

Publication date: February 1, 1973

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  • 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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