施設園藝作物을 加害하는 짓딧물을 效率的으로 防除하기 위하여 殺蟲劑인 imidacloprid를 有效成分으로 하고 低密度 포리에틸렌과 醋酸비닐을 高分子 媒體로 하여 放出調節型 殺蟲性 農藥製劑를 製造하고 그 理化學的 特性 및 藥效를 調査한 結果는 다음과 같다. 1. 試製品중 農藥主成分의 製劑率은 90% 이상으로 대부분의 農藥이 合成樹脂에 含有되어 있었다. 2. 農藥主成分의 水中溶出樣相은 合成樹脂의 混合比率에 따라 큰 차이를 보여 低密度 포리에틸렌의 含量이 높을수록 溶出速度는 緩慢하였다. 3. 試製品중 農藥主成分의 經時分解는 處理初期에는 적었으나 處理 90일 후에는 分解率이 10% 이상으로 높았으며 유효기간은 1년으로 평가된다. 4. 土壤중 農藥殘留樣相은 旣存의 粒劑와 크게 달라 장기간에 걸쳐 일정수준이 유지되었으며 水中溶出試驗의 結果와 밀접한 연관성을 보였다. 5. 장미와 국화진딧물에 대한 效果는 우수하였고 處理 120후에까지 藥效가 持續되었으며 1회의 처리로 기존 진딧물약의 다수 살포작업을 절약할 수 있어 새로운 農藥劑型으로서의 개발가능성이 제시되었다.

This study was carried out to develop a controlled-release insecticide formulation for the control of rose aphid (Macrosiphum ibarae) in rose and cotton aphid (Myzus persicae) in chrysanthemum (Dendranthema grandiflorum var. Meibung) in greenhouse. Imidacloprid[1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine] was chosen as a toxicant. Two synthetic polymers, low density polyethylene(LDPE) and ethylene vinyl acetate(EVA), were used as polymer matrices. The tested plastic sheet formulations were prepared by heat-aided extrusion procedures after mixing imidacloprid technical and the polymers of three different combinations, and physicochemical properties as well as efficacy of the formulations were investigated. The amounts of imidacloprid recovered and incorporated in the formulations were recorded over 90 % and 80 %, respectively. Release of the active ingredient from the formulations was remarkably affected by mixing rates of polymers. The active ingredient in the formulations was chemically unstable with over 10 % degradation rates after 90 day storage at 50±2℃. The residual amounts of imidacloprid in the soil treated with the formulations were paralleled with the release pattern of the formulations. Efficacy of the formulations on rose and cotton aphid was maintained over 90% even 120days after treatment under greenhouse.