几种有机氯杀虫剂防治小麦吸浆虫成虫研究

施用药剂杀灭小(?)吸浆虫成虫,是防治吸浆虫重要方法之一。以几种有机氯杀虫剂进行室内、田间杀虫作用和药效等研究,证明γ 666、艾氏剂、狄氏剂和DDT 均具有强大的触杀作用,其中以γ 666毒效最怏,DDT 最慢。γ 666及艾氏剂还具有相当强的熏蒸杀虫作用。田间试验结果也说明γ 666粉剂浓度虽低至0.1%,仍能杀虫95%以上。0.25% γ 666粉剂效果与0.5%的相若,试验也证明,不同浓度的γ 666粉剂兑土稀释为0.25%药粉,稀释土的种类,对杀虫效果均无影响,并在全国不少地区推广应用均证明效果显著,解决了药剂供应问题,扩大了防治面积。田间残效试验证明,不同浓度的666粉剂,在羽化盛期前2天施用,均能毒杀羽化盛期的成虫;但如在前5天施用,除1%粉剂效果较好外,0.25%及0.5%粉剂浓度的防治效果均不理想。

EXPERIMENTS WITH SEVERAL CHLORINATED HYDRO-CARBON INSECTICIDES AGAINST THE ADULT STAGE OF WHEAT BLOSSOM MIDGE(SITODIPLOSIS MOSEL-LANA(GEHIN))

Four chlorinated hydrocarbon insecticides were tested in the laboratory for their contact and fumigant action against the adults of wheat blossom midge(Sitodiplosis mosellanna(Gehin)).Different concentrations and dosages of these insecticides were used.The results indicated that gemma BHC was the most toxic and equally effective as contact and fumigant poison.These compounds appeared in the following order of toxicity as contact poison:gamma BHC>Aldrin=Dieldrin>DDT;and as fumigant action:gamma BHC>Aldrin=Dieldrin>DDT.The field plot tests with different concentrations or dosages of the five chlorinated hydrocarbon gave satisfactory results when 0.25% gamma BHC,0.15% aldrin,1% Dieldrin,1% DDT or 10% Toxaphene dusts were applied at the rate of 22.5 kilograms per hectre when the adult midges first appeared in the wheat field,although it was not effective until 5 days after application.Significantreductions of the wheat blossom midge were obtained with all treatment but gamma BHC was the most effective of all.