Laboratory Tests on the Toxicity of Chemicals for Cutworm (Agrotis ypsilon Rot.) Larvae
Other Title
幾種殺蟲藥劑對切根蟲幼蟲室內毒力比較試驗
Journal
農業研究
Journal Volume
8
Journal Issue
2
Start Page
43
End Page
47
Date Issued
1959-06-06
Date
1959-06-06
Author(s)
Tung-Ting Liang
Hsien-Hsiu Liu
梁同庭
劉顯修
Abstract
As showed in the petri-dish tests and pot tests of this experiment, the toxicity of the insecticides is influenced by the different methods of application, the chemicals used for both contact and stomach poison at the same time are more effective than that of individual.
In the emulsion form, to the 5th instar larvae, endrin shows the best effectiveness, the order of the decreasing toxicity of the chemicals tested is 0.06% endrin (active ingredient)>0.06% aldrin>0.06 dieldrin>0.12% heptachlor>0.03% aldrin>0.03% endrin >0.03% dieldrin>0.12%, lindane=0.27% DDT. In the pot test, heptachlor can give better results but 0.24% of its active ingredient is minimum requirement. Still, it is less effective than 0.12% of endrin.
In the powder form, endrin is more effective than heptachlor, 5% of endrin and 10% of heptachior provide the better results.
切根蟲(Agrotis ysilon Rot.)為旱地農作物之重要害蟲，其幼蟲日伏夜出，爬行能力頗強，且在田間之分佈又極不均勻，故其田間藥劑防治之研究，除較為粗放之藥效示範試驗以外，精確之田間試驗頗難實施；且田間示範試驗又當依據室內毒力比較試驗結果，選拔效果較佳之藥劑及濃度進行研究，俾減少田間試驗之處理項目，而增加其重複次數，以期減少害蟲分佈不勻之影響而增加該試驗之精確性。作者等於民國48年度，就殺蟲藥劑藥效生物檢定之便，以數種可能利用之藥劑進行室內毒力比較試驗。茲將其試驗結果稍加整理，草成此文，或可供從事田間試驗工作者之參考。本試驗共包括玻璃皿試驗及盆栽試驗兩個部分；各試驗均分別進行液劑及粉劑兩處理。所用昆蟲為自行飼育之切根蟲第5齡幼蟲。其試驗結果摘要如下。
一、玻璃皿試驗：用於乳劑時，在所測定之6種藥劑中其胃毒及接觸之混合毒力（玻璃皿及菜葉均施藥劑）以endrin之毒力最強，其各處理之毒力順序為0.06%a endrin（死亡率70b)>0.06% adldrin (65)>0.06% dieldrin (62)>0.12% heptachlor (48)>0.03% aldrin (47)>0.03% endrin (38)>0.03% dieldrin (37)>0.12% lindane (35)=0.27% DDT(35)>0.06% hepta•chlor (30)>0.18% DDT(27)>0.06% llndane (20)。各劑之毒力因施藥部位之不同而有極大差異，玻璃皿及菜葉均施有藥劑者，其治蟲效果顯較單獨處理玻璃皿或菜葉者為佳。用於粉劑處理時，endrin之毒力亦較heptachlor為強，其毒力因所施之濃度及所接觸之時間而不相同。在本試驗之處理環境下，10% heptachlor接觸30分鐘，5% heptachlor接觸40分鐘及5% endrin接觸30分鐘均可獲得80%以上之治蟲效果。
二、盆栽試驗：據噴霧及撒粉兩種處理證實，10% heptachlor粉劑，0.25% heptachlor乳劑或0.12% endrin乳劑均有較高之治蟲效果，唯各劑均需施於菜苗及土面方能獲得較佳之成效。
Publisher
農業試驗所
Type
journal article
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