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Toxicity of Pesticides to Scirtothrips citri (Thysanoptera: Thripidae) and Implications to Resistance Management

1986; Oxford University Press; Volume: 79; Issue: 3 Linguagem: Inglês

10.1093/jee/79.3.565

1938-291X

J. G. Morse, O. L. Brawner,

Entomopathogenic Microorganisms in Pest Control

The historical pattern of pesticide use for control of citrus thrips, Sclrtothrips citri (Moulton), and rapid development of resistance to several control materials are discussed. Toxicities of nine thripsicides to adult females from three colonies collected in 1981, 1983, and 1984 from commercial navel orange groves in California's San Joaquin Valley were evaluated by standard techniques and probit regression analysis. Resistance (as indicated by LC90's in excess of the field rate) in at least one colony to dimethoate, bendiocarb, DDT, fluvalinate, flucythrinate, and avermectin was observed. In addition, increased tolerance to acephate, formetanate, and carbosulfan was correlated with increased use of these materials. Because the number of efficacious pesticides is limited and resistance appears to develop quite rapidly, future S. citri management strategies should emphasize minimal use of chemical control.