土农药毒力测定及空仓消毒初报

PRELIMINARY REPORT ON TOXICITY OF INDIGENOUS PLANT INSECTICIDES TO STORED GRAIN INSECTS AND DISINFESTATION IN WAREHOUSE

试验收集了四川省28种土农药及50种采自广东、湖北、云南和四川的新鲜土农药.在室内用米象、赤拟谷盗、锯谷盗作了初步毒力测定,根据找出的有效品种拟定了17种的复方,亦同时进行了毒力测定试验.试验指出:二乌子、苦角、巴豆、百部、苦参、鱼藤、闹羊花、茶夫、鱼鳞子、烟叶、皂荚等11种品种及复方1.2,杀虫效果较显著,值得生产上使用.在生产条件下,用相近的室内有效浓度,剂量进行空仓消毒试验杀虫效果为50%左右,说明有效地杀死害虫还需提高用药量.在今年试验基础上,今后应在确定有效品种用药量,继续挖掘有效品种及土熏烟剂三方面展开工作.

Effects of 28 sorts (Tab.1) of local plant insecticides collected in Sichuan province and 50 sorts(Tab.2) of fresh indigenous plant insecticides collected in Gongdong, Hubei, Yunnan and Sichuan province were extracted with water and compared in laboratory against Sitophilus oryzea L., Tribolium castanium Hbst, and Oryzaephilus surinamensis L., and 17 sorts (Tab.3) of combinations prepared were also tested. Results showed that, 11 sorts of them including Croton tiglium L. Stemona japonica Mig., Sophora flavescens Ait., Derris uli. inosa Roxb., Rhododendron molle Sieb et zucc. Camellia oleosa Rehd., Nicotiana tabacum L., Gleditschia sinansis Lam., Er-wu-zi, Ku-jiao, Yu-lin-zi and 2 combinations were more effective. 7 single formulations and 2 combinations (Tab.4) were tested for disinfestation in warehouse, the totle mortality of all insects in warehouse were 50% or so.