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Residual Toxicity of Four Citrus Insecticides in South Africa to the Scale Predator Chilocorus nigritus (Coleoptera: Coccinellidae)

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The effects of residues of various concentrations of triazophos, tartar emetic, chlorpyriphos, and mineral oil on last instars and adults of Chilocorus nigritus (F.) were determined. Only triazophos had a residual effect on the beetles. When triazophos is included in an integrated pest management program on citrus, it should be used at the dosage of 60 ml triazophos per 100 liters water applied twice, rather than as a single application of 125 ml triazophos per 100 liters water. Under field conditions, triazophos lost its toxicity to adult C. nigritus in only 5 d but was toxic for 16 d against last instars. Under glasshouse conditions, triazophos lost its toxicity against adults in 30 d.

Document Type: Research Article

Publication date: August 1, 1988

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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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