黑凹胫跳甲发生情况的调查观察与药剂防治试验

本文对海口郊区蕹菜上发生的黑凹胫跳甲Chaetocnema baslis(Baly)]的生活史、生活习性和为害情况,进行了调查观察;同时对该虫进行了化学防治试验。结果表明:该虫在海口郊区一年可发生4个世代,具世代重叠,而无越冬现象;成虫群集性强,性喜干燥,畏忌潮湿;为害蕹菜损失率一般为12％左右。药剂防治以50％的巴丹可湿性粉500倍液喷雾效果较好,药后24小时防效达100％。

Investigation and Observation of the Occurence and Experiment in the Peslicide Prevention and Control of Chaetocnema Baslis (Baly)

The paper represents our investigation and observation of the life circle, habits and harm of the Chaetocnema baslis(Baly) and,mean while, experiment in the chemical prevention and control of the insects has been carried out. The results show that these insects can reproduce four generations on the suburban areas of Haikou each year. These generation overlap, but none of them overwinter. The imagoes of Chaetocnema baslis(Baly)like to swarm in dry environment, and are afraid of wet surroundings. The average rate of damage to Ipomoea aquatica Forsk caused by the insects reaches about 12 per cent. Chemical prevention and control of the insects by a spray of the solution of 50 per cent Padan with 500 times as much water produces a good result, and will be a hundred per cent eflective in twenty-four hours.