Characterization of insecticide resistance in two colonies of Liriomyza trifolii (Diptera: Agromyzidae)
1990
Keil, C.B. | Parrella, M.P.
Two populations of Liriomyza trifolii (Burgess), FLA (from celery, Florida) and NP (from chrysanthemum, California), were examined for insecticide resistance by topical application and comparison with a field-collected, susceptible colony APG (from bedding plants, California). Initially, FLA L. trifolii were moderately resistant to methamidophos and permethrin. Resistance in this colony declined over three months in the absence of further selection to the level of the susceptible colony at LC90. Experiments with synergists indicated that oxidative and hydrolytic metabolism may have contributed to resistance in FLA L. trifolii. NP L. trifolii were resistant to permethrin, methyl parathion, methamidophos, and a mixture of methyl parathion and permethrin. These flies were also cross-resistant to DDT and cypermethrin. Oxidative metabolism was implicated as a resistance mechanism but could not account for all resistance to permethrin. A nerve insensitivity factor, kdr-like, was probably also active in producing permethrin resistance. Methyl parathion effectively synergized permethrin in experiments in which joint action of these compounds was investigated. Developmental time and body size of NP and APG L. trifolii reared on chrysanthemum did not differ.
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