Reproductivity of dicofol susceptible and resistant strains in the two-spotted spider mite, Tetranychus urticae KOCH.

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  • KONO Satoshi
    Hyogo Prefectural Agricultural Center for Experiment, Extension and Education

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  • ディコホル感受性および抵抗性ナミハダニの増殖能力
  • ディコホル カンジュセイ オヨビ テイコウセイ ナミハダニ ノ ゾウショク ノ

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Reproductive ability in dicofol susceptible and resistant strains of the two-spotted spider mite, Tetranychus urticae KOCH, of the same origin was tested by the method of leaf disk at the temperatures of 20°C, 25°C and 30°C. Both the survival rate and egg production in the susceptible strain tended to be higher than in the resistant one at 25°C and 30°C. Hatchability of the eggs was somewhat higher in the susceptible strain than in the dicofol resistant one at each temperature, and the intrinsic rate of natural increase (rm) was also higher in the susceptible strain than in the resistant one at each temperature. Emergence rates in both the 1st and 2nd generations were partially higher in the susceptible strain than in the dicofol resistant one, and mean no. of eggs per female of the susceptible strain was also larger than that of the dicofol resistant one at 25°C. Developmental period of the pre-adult stage was slightly shorter in the susceptible strain than in the resistant one at each temperature. These results indicate that the dicofol resistant strain showed lower values of fitness than the susceptible one under an acaricide-free environment and that the susceptibility of the dicofol resistant strain recovered slowly after relaxation of the dicofol pressure.

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