Teflubenzuron Toxicity Impact and Resistance Consequences on Plutella xylostella L. (Lepidoptera: ..

Because of the importance of controlling Plutella xylostella L. (Lepidoptera: Plutellidae) and the requirement to use pesticides, it is necessary to conduct significant research and investigations on the impact of insecticides on the biology of this important Brassica crop pest. Then a life table is a good approach to quantify these consequences. In this work, three strains of P. xylostella were used: the unselected population was reared for four months without insecticide exposure, whereas the selected population was reared for four months with a sublethal dose of teflubenzuron. To begin with, the LC50 values for kalubia were 1.79 ppm, which corresponds to the population susceptibility levels for this insecticide, which drop to 1.6 ppm in the unselectred and grow to 2.2, 2.9, and 4 ppm for the selected strain three generations, respectively. The resistance ratio between selected and unselected refers to the strain's ability to build resistance to this insecticide. Fertility The results of the life table apply to the P.xylostella rearing under teflubenzuron insecticide selection pressure, or, to put it another way, the relative fitness that decreased after the kalubia population was reduced from 1.4 to 0.64. For kalubia, selected and unselected strains, the net reproduction rate, R0, and mean generation time were 1.7, 2.4, and 3.75, 17, and 19.18, 17.4 days, respectively. The finite rate of increase () was 1.032, 0.047, and 1.079 in the same configuration, while the doubling days were 22.08, 15.1, and 9.13 days, respectively. Similarly, the intrinsic rate of growth (rm) for the identical arrangement was 0.0314.0.046 and 0.076, respectively. Low larval survival rate, longer larval and pupae duration, and longer development time were also noted, as were low emergence rate, fecundity and hatchability, and life span as compared to an unselected strain.

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