试验表明,芜菁夜蛾线虫Mexican对梨象鼻虫幼虫具有很高的侵染力,当线虫剂量在150～2400条/虫范围内,3d后害虫死亡率达46.7～100％。在室温下(23℃～25℃)线虫能在梨象鼻虫幼虫尸体内大量繁殖,平均每虫尸繁殖侵染期线虫1.6万条。经试验证明能继续侵染陆续发生的梨象鼻虫幼虫。花盆试验表明,4weeks后害虫致死率达87～92％田间防治试验结果表明,4weeks后害虫死亡率达80.3～82.9％。 Tests showed that the verrucose moth cv. Mexican had a high infectivity on pear weevil larvae. When the nematode dose was in the range of 150-2 2400 insects per insect, the mortality rate of pest after 46 days was 46.7-100%. At room temperature (23 ℃ ~ 25 ℃), nematodes could multiply in the body of pear weevils larvae, with an average of 16,000 nematodes per worm during reproduction. The test proved to be able to continue the infection of pear weevil larvae. The pot experiment showed that the lethality of pests after 4weeks was 87-92%. The field control test showed that the mortality of pests after 4weeks was 80.3-82.9%.