Ambulatory dispersal of the susceptible and propargite-resistant strains of Tetranychus urticae and its influence on pesticide resistance dynamics

다국어 초록 (Multilingual Abstract)

The distribution of resistant individuals is determined by the amount of movement between populations. Thedifferential rate of dispersal of a susceptible and a pesticide-resistant strain could influence the resistance dynamicsunder field conditions. The dispersal rate and dispersal efficiency of the susceptible and propargiteresistantstrains of Tetranychus urticae were measured in separate-release and mixed-release experiments. Thediffusion coefficient (D) of both strains did not differ significantly (P > 0.344) and an estimate of the asymptoticrate of advance (2√rD) (for one generation) was estimated at 0.1047 and 0.0930 cm per degree day for thesusceptible and propargite-resistant strains, respectively. The dispersal efficiency of the two strains differedsignificantly (P < 0.005) as more susceptible mites than propargite-resistant mites crossed into specified zonesmore quickly after 290 and 366 degree days. Significantly (P < 0.05) higher number of susceptible adults,immatures and eggs were found in the outer most zone of an arena as compared to that of the propargiteresistantmites. The bioassay of the two strains showed a similar pattern of the spread of the adult females acrossthe specified zones in the mixed-release experiment. The relatively lower dispersive tendency of the propargiteresistantT. urticae and the smaller proportion of adult females exhibiting that behaviour increase the chances ofdeveloping resistant ‘hotspots’ in field specially after an acaricide application.

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