Imidacloprid is applied at transplanting to nearly 100% of the tomato acreage in Florida for control of the silverleaf whitefly, Bemisia argentifolii Bellows & Perring, and the geminiviruses it transmits, primarily tomato yellow leaf curl virus. A cut leaf petiole method using cotton seedlings was used to estimate the susceptibility of whitefly populations to imidacloprid from nine imidacloprid-treated tomato fields in the spring of 2001 and 14 in the spring of 2002 using adults reared from field-collected nymphs. Standard probit analyses were used to describe the log dose response and to estimate the LC50 values for the laboratory colony and each field population. RR50 values (the ratio of the LC50 of the field population to that of a highly susceptible laboratory colony) ranged from about 2 to 15 in 2001 and from about 1 to 35 in 2002. The RR50 value of progeny of bioassay survivors from one 2001 field decreased from 8 to 2 in about 4 generations in the laboratory.
Species 1: Homoptera Aleyrodidae Bemisia argentifolii (silverleaf whitefly)
Keywords: insecticide resistance, vegetable insect control
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