24种植物提取物对双纹须歧角螟的产卵忌避作用

对24种植物提取物对双纹须歧角螟成虫的产卵忌避作用进行研究。结果表明,有6种植物提取物的产卵忌避率在80%以上,分别是:番荔枝95.05%、三杈苦93.40%、鸦胆子88.31%、枫杨86.67%、毛鸦胆子81.97%、米仔兰80.06%。选择室内产卵忌避效果最好的番荔枝提取物进行田间小区试验,施药后1 d的产卵忌避率为91.40%,与室内的相当,着卵花序数比对照减少71.72%。但田间持效期不长,施药后第3天效果已迅速下降。

Studies on the ovipositional deterrent activity of 24 plant extracts against Trichophysetis cretacea

The study was conducted to test the ovipositional deterrent activity of 24 plant extracts against Trichophysetis cretacea Butler. The results showed that, in the indoor trial, six plant extracts from Annona squamosa, Evodia lepta, Brucea javanica , Pterocarya stenoptera , Brucea mollis and Aglaia odorata had higher ovipositional deterrent activity, with the deterrent rate as 95.05%, 93.40%, 88. 31%, 86. 67%, 81.97% and 80. 06%, respectively. The plant extract from A. squamosa, which showed the best effect in the indoor trial, was then further tested in the field plot trial, and the rate of oviposition deterrent was 91.40% one day after application, similar as that of the indoor trial, while the total number of spawned-flower reduced by 71.72% compared with the control, and the persistent period of field effect was short. The activity went down quickly 3 days after the application.