绿僵菌油悬浮剂防治草地蝗虫田间试验

FIELD TRIAL OF CONTROLLING GRASSLAND GRASSHOPPERS FOR METARHIZIUM FLAVOVIRIDE

2012年在青海省祁连县央隆乡进行了绿僵菌(Metarhizium flavoviride)油悬浮剂防治草原土蝗的田间试验。绿僵菌孢子含量为100亿孢子/g。药效调查采用0.25m2方框取样器五点式取样法。结果表明:供试药剂绿僵菌1#油悬浮剂300ml/hm2、450ml/hm2、600ml/hm2的剂量,防后7d平均防效分别为:83.9%、94.6%、95.9%,2#油悬浮剂300ml/hm2、450ml/hm2、600ml/hm2的剂量,防后7d平均防效分别为:83.9%、94.6%、95.9%。施药时主要虫态为4～5龄期,施药后3～5d出现感病死虫,在施药区没有发现大量死亡的其它昆虫,施药后牧草生长良好,具有一定的推广价值。

A field experiment was conducted at Yanglong village in Qihan county, Qinghai province in 2012 in order to protect against grassland grasshopper with Metarhizium ilavoviride 1#,2# oil suspension. The content of the Metarhizium flavoviride spore is 10 billion spore per gram. We utilise a 0.25m2 square sampler with the sampling method of five - points. Conclusion ： Using the dosage of Metarhizium flavoviride 1 # oil suspension 300,450 and 600 ml/ha,the average effects after 7 days are 83.61% ,94.54% ,95.80% ,while after using the 2# oil suspension 300,450 and 600 ml/ha 7 days,the average effects are 71.65% ,87.74% ,89.84% o There is a appearence of dead grasshoppers which are killed by the medicine after the application of the medicine 3 to 5 days ago ,and the age of the dead grasshoppers are basically 4 to 5. Additionally ,we have not found numerous deaths of any other insects and the pasture grew well. The experiment was friendly to the environment and there was no secondary poisoning, we believe it deserves a promotion.