Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
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Differential Susceptibility of Tetranychus urticae and its Predator, Phytoseiulus persimilis (Acari: Tetranychidae, Phytoseiidae) against Individual and Combined Treatments of Plant Extracts

점박이응애와 포식성 천적인 칠레이리응애의 식물추출물 단독 및 혼합 처리에 대한 감수성 비교

  • 이찬주 (순천대학교 식물의학과) ;
  • 국용인 (순천대학교 한약자원개발학과) ;
  • 김상수 (순천대학교 식물의학과)
  • Received : 2019.03.21
  • Accepted : 2019.05.20
  • Published : 2019.08.31
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Abstract

The differential susceptibility of the two spotted spider mite, Tetranychus urticae and its predator, Phytoseiulus persimilis against extracts of Gleditsia japonica var. koraiensis, Camellia sinensis, Cinnamomum cassia, Lantana camara and their mixtures was evaluated. The plant extracts tested were much less toxic to P. persimilis than to T. urticae. The 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. The treatments of the plant extracts tested showed no serious toxic effect on P. persimilis eggs and exhibited 84~100% hatchability. The treatments with mixtures 3 and 1 were effective against the adult females of T. urticae and yielded 76.0% and 72.7% adulticidal activity at 7 days after treatment, respectively. The treatment of mixture 2 revealed 63.3% adulticidal activity. Generally, the acaricidal activity of the individual treatment of each plant extract was lower than the mixtures. The adult females of T. urticae treated with mixtures 3 and 1 produced only 29.5~31.3% as many eggs as the control females did. All the plant extracts tested exhibited no noticeable toxic effect to the eggs of T. urticae. These results suggest that mixtures 3 and 1 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.

점박이응애와 포식성 천적인 칠레이리응애의 주엽, 차나무, 계피, 란타나 등의 추출물과 이들의 혼합액들에 대한 감수성의 차이를 검정하였다. 실험 식물추출물들은 모두 점박이응애보다 칠레이리응애에 대해 저독성을 나타냈으며, 칠레이리응애 암컷 성충의 산란수와 산란된 난들의 부화에 큰 영향이 없었다. 실험 식물추출물들의 처리에서 칠레이리응애 난들은 84~100%의 높은 부화율을 보였다. 반면에 점박이응애에 대한 혼합액 3, 1 등의 처리는 7일 후에 각각 76.0%와 72.7%의 살성충 효과를 나타내었으며, 혼합액 2의 처리에서는 63.3%의 살성충 효과를 보였으나 단독 처리에서는 혼합 처리보다 낮은 살성충 효과를 보였다. 혼합액 3, 1 등의 처리에서 점박이응애 암컷 성충의 산란수는 무처리 대비 29.5~31.3%에 그쳤다. 실험 식물추출물들은 점박이응애 난에 대한 주목할 만한 살란 효과가 없었다. 이와 같은 실험결과들로 보아 혼합액 3, 1 등은 점박이응애의 방제제로 사용 가능성이 있으며, 점박이응애의 종합관리체계에서 칠레이리응애와 함께 활용할 수 있을 것으로 기대된다.

Keywords

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