荒漠草原新害虫——无翅大头粪金龟药剂防治试验研究

CHEMICAL CONTROL OF LETHRUS APTERUS IN DESERT STEPPE

本文是在对荒漠草原新害虫——无翅大头粪金龟(Lethrus apterus)生物学特性和生态特征研究的基础上,进行的药剂防治试验研究报告。在不同浓度的对比试验中,筛选出1:1500—2000倍稀释的40%乐果乳油防虫效果好、费用低;提出防治时期为5月底到7月初,而最适防治时间是为害盛期前夕,即山丹地区为6月5日～10日;确定防治指标为0.4头/米~2,而经济允许损失水平为8.08%。此研究成果经6667公顷草地上示范推广,防虫效果达92.4%,年减少牧草损失为15730吨鲜草,取得了良好的经济效益。

On the basis of the research of biological and ecological characteristics,the current paper reported the chemical control of Lethrus apterus.Chemicals with various type and different concentrations have been test- ed.The results showed that the one with the best control effect and lower cost was Roger dilution which is diluted by 40% Roger emulsion in the ratio of 1 to 1500 or 2000.It was necessary to apply the chemical from early May to early July before the serious attack of the pest(in Shandan the corresponding time is from 5 to 10 of June).It was 0.4 head/m pests that had been set as the application index whilst the accepta- bale forage loss was 8.08%.The research achivement has been extended to 6667 ha of grassland.It has been estimated that the controlling effect reaches 92.4%.The annual loss was reduced by 15730000 kg fresh grass which is valued 1150000 yuan.The increased profit rate of scientific and technological expenses was 10.85 yuan/yuan.