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소나무재선충병 방제를 위한 에마멕틴 벤조에이트의 나무주사 시기와 천공수에 따른 약효와 잔류량 비교
이상명(Sang Myeong Lee),정영학(Young Hak Jung),서상태(Sang-Tae Seo),김동수(Dong Soo Kim),이동운(DongWoon Lee) 한국농약과학회 2021 농약과학회지 Vol.25 No.4
Tree injection is widely used as an effective method for preventing pine wilt disease. However, the method leaves behind scars on the trees, inflicted by the hole drilling activity done to create a pathway for nematicide injection. Therefore, this study was conducted to evaluate the effect of treatment, according to the number of drilled holes, and to find a suitable method of effectively administering the nematicide to prevent pine wilt disease while minimizing injuries to trees. In addition, in order to determine the suitable time of tree injection, the effect of treatment according to the number of days after tree injection of emamectin benzoate (EM) was investigated. In both medium- and large-sized pine trees, the number of drilled holes did not show any difference in inhibiting the population density multiplication of pine wood nematode after tree injection, and there was no difference in the residual amount of EM. In the case of EM injected into pine trees in February, the inhibitory effect was shown in the lower part of the trunk from 7 days after injection, and eventually, in the entire trunk after 21 days after injection. In the case of pressurized tree injection in May, the effect of inhibiting the multiplication of pine wood nematode was shown in the entire trunk from 14 days after injection. There was no difference in efficacy or residual amount depending on the number of injection holes. It is therefore recommendable to use an injection bottle to drill a minimum number of holes in trees for injection. In the case of EB tree injection for the prevention of pine wood nematodes, treatment within at least 3 weeks before the occurrence of vectors is recommended.
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