Life table and relative fitness of a strain Plutella xylostella resistant to Bacillus thuringiensis Cry1Ac toxin
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Key Words：Plutella xylostella, Cry1Ac toxin, life table, relative fitness
Abstract： A resistant strain (DBM1AcR) of Plutella xylostella L. (diamondback moth) with more than 1 000fold resistance to Cry1Ac was obtained. Life history characteristics, such as the development and fecundity of susceptible (DBM1AcS) and resistant strains, were studied. Life tables were established and the relative fitness cost of developing resistance analyzed. The results show that the DBM1AcR strain has distinct reproductive disadvantages, such as a fitness value of 0.5762, including lower fecundity, hatching rate, pupation rate and sex ratio (♀:♂), shorter egg period and lighter pupa weight, compared with the nonresistant DBM1AcS strain.