三氟氯氰菊酯浸泡蚊帐防制蚊媒的实验小屋试验

目的：探讨防制蚊媒的有效方法。方法：将棉纱蚊帐分别浸泡20mg／m2和10mg／m2三氟氯氰菊酯，在实验室进行持效生物测试。结果：浸帐后1年内对中华按蚊的平均致死率分别为80．1％和74．0％。实验小屋试验，在全闭帐条件下，蚊帐浸泡三氟氯氰菊酯40mg／m2后2~168天内，对中华按蚊和三带喙库蚊的平均毒杀率分别为72．5％和72．2％；与对照组比较，可减少蚊虫吸血率，中华按蚊为56.7％，三带喙库蚊为43．3％；在半闭帐条件下，浸帐后12～174天内对上述两种蚊媒的平均毒杀率分别为45．0％和38．6％，分别减少吸血率27．4％和32．3％。在20mg／m2全闭帐条件下，浸帐后2～14天内对中华按蚊和三带喙库蚊的平均毒杀率分别为49．8％和53．4％，分别减少吸血率60．3％和69．5％；在半闭帐条件下，浸帐后15～22天内对这两种蚊媒的平均毒杀率分别为30．3％和44．3％，分别减少吸血率30．0％和36．5％。结论：三氟氯氰菊酯浸泡蚊帐的剂量应不低于20mgai／m2，以确保防制蚊媒的效果和发挥控制疟疾流行的作用。

Observation on Toxic Effect of Clocythrin-Impregnated Bednets against Mosquitos

In laboratory, 20mg ai/m2 and 10mg ai/m2 clocythrin-impregnated bednets caused the average mortalities of 80.1 % and 74.0% on laboratory-bred An. sinensis within one year respectively. In experimental hut trials, the average mortalities of An. sinensis and Cx. tritaeniorhynchus were 72. 5% and 72.2% with 4 0mg ai / m2 in clocythrin - treated bednets, 168 days after impregnation, and were 45.0% and 38.6% with the semi-closed treated bednets respectively. By comparison with the control hut, the intact closed treated bednet reduced the feeding rate by 56.7% for An. sinensis and by 43. 3% for Cx.tritaeniorhynchus. The semi-clased treated bednets reduced the feeding rate by 27.4% and by 32. 3% respectively. Meanwhile, 20mg ai/m2 clocythrin-impregnated bednets caused 49. 8 % average mortality of An.sinensis and 53. 4% average mortality of Cx. tritaeniorhynchus within 14 days after treatment, and it reduced the feeding rate by 60. 3% for An. sinensis and by 69. 5% for Cx. tritaeniorhynchus. And the average mortalities of 30. 3 % and 44. 3 % were obtained with the semi-closed treated bednets respectively, 22 days after impregnation. The feeding rate was reduced by 30.0 % for An. sinensis and by 36. 5 % for Cx.tritaeniorhynchus.