Evaluation of Chrysanthemum Cultivars and Insecticides for Control of Damage by a Leafminer, Liriomyza trifolii (Diptera: Agromyzidae)

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Chrysanthemum cultivars grown for pot flower production in greenhouses exhibited various and potentially useful levels of resistance to Liriomyza trifolii (Burgess). Leafminer control with insecticides was significantly (P <0.05) enhanced when applied to resistant varieties. Evaluations of insecticides showed an initial tolerance of the South Carolina population to permethrin and moderate control (71%) by foliar treatment with encapsulated methyl parathion. Permethrin regained efficacy after a 6-month period during which pyrethroid sprays were withheld. Methamidophos, cypermethrin, and permethrin treatments resulted in 90 +% control in subsequent tests, but methamidophos was phytotoxic to foliage of most cultivars at standard application rates. Tank mixes of pyrethroids and encapsulated methyl parathion gave greater efficacy than either chemical used alone. Fenvalerate treatments provided moderate control. Oxydemeton methyl showed no efficacy against the leafminer.

Document Type: Research Article

Publication date: October 1, 1982

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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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