긴덜이리응애와 dicofol 저항성 및 감수성 점박이응애에 대한 아바맥틴의 선택독성을 실험실 내에서 엽침지법으로 조사하였다. 아바멕틴은 긴털이리응애에 대해서는 독성이 낮은 반면, 점박이응애에 대해서는 살균효과가 높았다. 0.12 ppm과 0.6 ppm의 농도에서 점박이응애는 두 계통 모두 침지 후 48시간 0]내에 사망하였고, 0.06 ppm과 0.012 ppm의 낮은 농도에서 120시간 이후에는 77% 이상이 사망하였다. 그러나긴털이리응애의 암컷성충은 0.12ppm에서는 생존솔과 활동력이 영향을 받지 않았고, 0.6ppm과 6ppm의 높은 농도에서도 사망솔이 약 20~23%이었다. 아바맨틴은 산란후 l일 이내의 점박이응애의 난에 대해서는 패화솔에 영향을 미치지 않았으나 산란후 4일된 란에서는 패화솔이 멸소하였다. 반면에0.006-6ppm 용액에 긴털이리응애 난을 침지한경우 난의 패화솔과 그 난에서 부화한 약충의 발육에는 영향이 없었다. 긴털이리응애의 암컷 성충을 0.6 ppm과- 0.12ppm에 침지했을 때 산란수가 줄어들지 않았으나 잠박이응애의 산란수는0.006-0.6 ppm의 농도에서 현저히 감소하였다. 이상과 같이 아바맥틴은 점박이응애와 긴털이리응애에 대한 선택독성이 높은 약제로 점박이응애의 결합방제에 유용하게 이용될 수 있을 것으로 생각되며, 점박이응애에 대한 아치사농도(0.012-0.06 ppm)는 긴털이리응애와 점박이응애의 밀도를 조사하는데 이용될 수 있을 것으로 생각된다.

The susceptibility of the predatory mite, Neoseiulus californicus to extracts of Melia azedarach, Piper nigrum, Syringa velutina and their mixtures was evaluated in laboratory bioassays. In treatments with plant extracts tested, 76-86% of adult female predators survived after 7 days after treatment. Adult female predators treated with plant extracts tested produced 68.3-81.1% as many eggs as did control females and eclosion of eggs deposited by treated predators was not affected. Moreover, treatment of plant extracts tested showed no toxic effect on N. californicus eggs and produced 100% hatchability. Survival of N. californicus nymphs was not seriously affected by exposure to the plant extracts tested. Immatures of N. californicus survived on the leaf disc treated with plant extracts tested and 78-90% of immature predators reached adulthood. These results suggest that extracts of Melia azedarach, Piper nigrum, Syringa velutina and their mixtures expected to be promising candidates for use in integrated mite management program with N. californicus.

The susceptibility of the twospotted spider mite, Tetranychus urticae and the predatory mite, Phytoseiulus persimilis to extracts of Melia azedarach, Piper nigrum, Syringa velutina and their mixtures was evaluated in laboratory bioassays. Treatments of mixture 1 and 2 were effective against adult females of T. urticae and yielded 73.3 and 70.7% adulticidal activity at 7 days after treatment, respectively. Treatment of mixture 3 revealed 62.7% adulticidal activity. However, M. azedarach, P. nigrum and S. velutina had lower adulticidal activity than the other treatments. Adult females of T. urticae treated with mixture 1 and 2 produced only 11.1-16.7% as many eggs as control females did. All the plant extracts tested were ineffective to against the eggs of T. urticae. Plant extracts tested had little effect on the survival of P. persimilis adult females. Moreover, reproduction of P. persimilis adult females and eclosion of eggs deposited by treated predators were not seriously affected. Treatment of plant extracts tested showed no toxic effect on P. persimilis eggs and produced 100% hatchability. These results suggest that mixture 1 and 2 might be used for the control of T. urticae, and expected to be promising candidates for use in integrated mite management program with P. persimilis.