Brassolis sophorae1 and Castnia daedalus:2 Chemical Control of These Major Pests of Coconut in Guyana3

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Abstract:

The coconut caterpillar Brassolis sophorae L. and the moth borer Castnia daedalus Cramer. are 2 major pests of coconut palm in Guyana. Continuous stripping of leaves by the caterpillar results in death of some palms, while others do not hear any nuts. Laboratory studies on comparative toxicity of 24 insecticides to the caterpillar indicated that methomyl. azinphosmethyl, monocrotophos, trichlorfon. and endosulfan were more toxic than the rest. Spraying of trichlorfon at 1.0 kg active ingredient (AI) in 11 liters and 1.0-1.5 kg AI in 20-30 liters of spray fluid per hectare from an aircraft and a tractor mounted sprayer, respectively. gave immediate control of the caterpillar, but the pest infestation continued because of overlapping generations. Injections of 3.6 grams AI or 6 milliliters of 607 monocrotophos emulsifiable concentrate in one hole per palm, gave complete kill or the caterpillar. The treatment was effective for at least 72 days and was thus suited to control overlapping generations of the pest. One mall injected 150-170 palms (1.3 hectare) per day with the help of a hand-operated Chest-brace drill.

The moth borer generally tunneled the trunk near leaf bases, hut in one area it tunneled the leaf bases rather than the trunk. With both these types of infestation, the leaves drooped and shed prematurely. The infested palms bore up to 54% as man)' nuts as uninfested palms. Injection of 3.6 to 6.0 grams of monocrolophos in 3 holes per tree killed the borer larvae in the trunk. while injection of up to 9.6 grams ill 3 or 4 holes per tree did not kill the borer larvae lodged in leaf bases.

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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