초록
차주머니나방에 의한 포도 잎 피해증상을 2012년 8월 31일 경북 영천시 금호읍에서 국내 최초로 확인하였다. 실내에서 5종 약제[Bacillus thuringiensis var. kurstaki (serotype IIIa, IIIb) WP, chlorantraniliprole 5% GP, methoxyfenozide 21% SC, spinetoram 5% GP, spinosad 10% GP]를 추천농도로 포도 잎 분무처리에 의한 차주머니나방 4령충의 살충율은 spinosad 10% WG와 spinetoram 5% WG에서 각각 65% 및 70%로 높았다. 추천농도 이하에서는 치사율이 감소하였고, 엽 피해면적율은 추천농도의 1/4배 처리에서도 무처리에 비하여 낮았다. 4령 유충에 대해 직접살포법으로 야외에서 효과조사를 한 결과는 spinetoram 5% WG와 spinosad 10% WG 처리의 보정사충율이 각각 63.7, 55.7%였다. 따라서 포도 차주머니나방 방제를 위해 spinetoram과 spinosad의 활용가능성을 나타내었으나, 보다 효과적인 약제선발이 요구되는 바이다.
Damage of tea bagworms, Eumeta minuscula was observed for the first time from grape leaves of grape (varieties: Cambell Early and M.B.A.) from a vinery at Gumho-up, Gyeongsan, Gyeongbuk on 31 August, 2012. Activity of insecticides [Bacillus thuringiensis var. kurstaki (serotype IIIa, IIIb) WP, chlorantraniliprole 5% GP, methoxyfenozide 21% SC, spinetoram 5% GP, and spinosad 10% GP] was tested on fourth instar larvae of Eumeta minuscula in laboratory. Mortality of 4th instar of Eumeta minuscula was higher when treated with spinosad 10% WG (88.7%) and spinetoram 5% WG (67.7%) sprayed with field recommended concentration using a home sprayer in laboratory. Mortality decreased as the concentration decreased, however leaf damage rate was significantly different between the one-fourth rate and the control. Spinetoram 5% WG and spinosad 10% WG showed 63.7 and 55.7% respectively mortality of fourth instar Eumeta minuscula in field. Though these two insecticides could be used for the control of bagworms on grape, a more effective insecticide needs to be found.
