Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
권호 표지

Damage Status of Poinsettia by the Fungus Gnat (Bradysia difformis) and Its Control with Predatory Mite (Hypoaspis aculeifer)

작은뿌리파리에 의한 포인세티아의 피해실태와 총채가시응애를 이용한 방제

Jeon, Heung-Yong;Kim, Hyeong-Hwan;Jung, Jae-A;Kang, Taek-Jun;Yang, Chang-Yul
전흥용;김형환;정재아;강택준;양창열

  • Published : 2007.12.31
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Abstract

Damage of poinsettia seedlings by the fungus gnat Bradysia difformis and control effect of the predatory mite Hypoaspis aculeifer against the fungus gnat were investigated in poinsettia propagation houses. Damage of plant seedlings by B. difformis were occured mainly within 30 days after poinsettia cutting, and seedling mortalities ranged from 12.4 to 19.6%. Daily predation rates of nymph and adult H. aculeifer were 1.8 to 5.1 and 2.3 to 5.4 larvae of fungus gnat, respectively. Control effect of H. aculeifer against B. difformis was increased by the additional treatment of H. aculeifer. Control efficacies were 83.2, 97.8 and 100% when H. aculeifer were inoculated one, two and three times, respectively. The survival rates, control efficacies of H. aculeifer against B. difformis and mortalities of poinsettia seedlings by B. difformis were significantly different by treatments of H. aculeifer after poinsettia cuttings. The control effects of H. aculeifer were higher, when H. aculeifer were inoculated in 7 days than in 14 days after poinsettia cuttings. When H. aculeifer were inoculated 5, 10, and 20 individuals in each poinsettia seedling pot, control efficacies were 89.5, 94.4, and 100%, respectively. The survival rates of poinsettia seedlings were higher, when H. aculeifer were inoculated in 7 days (99.8 to 100%) than in 14 days (76.0 to 84.0) after poinsettia cuttings. H. aculeifer was proved to be a successful biological control agent of B. difformis in poinsettia propagation houses, because of its high predation rate and continuing controlling effect.

Keywords

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