摘要
应用蝗虫微孢子虫防治棉蝗,是一种有效而很有前途的生物防治方法。用蝗虫微孢子虫(浓度1×106,1×108孢子/ml)接种1~5龄跳蝻,死亡率为72.8%和100%;感染微孢子虫的棉蝗,其取食量减少91.7%~93.8%;对2~3龄跳蝻的半致死浓度(LC50)为3.88×105孢子/ml,对4~5龄跳蝻的半致死浓度为3.98×106孢子/ml,对幼龄跳蝻的感染死亡率高,毒力强;可利用棉蝗进行增殖蝗虫微孢子虫;林间应用蝗虫微孢子虫防治棉蝗(浓度5×107,1×108孢子/ml),防治效果分别达到94.9%和100%。
Application of Nosema locustae to control Chondracris rosea is an effective and promising biological control method.In the trials,the death rate were 72.8%~100% for 1~5 instar nymph after inoculating(1×106 and 1×108 sporozoite/ml).The eating rate were reduced by 91.7%~93.8% for Chondracris rosea infected by Nosema locustae.The LC50 median lethal concentration for 2~3 instar nymph was 3.88×105 sporozoite/ml and for 4~5 instar nymph was 3. 98×106 sporozoite/ml.It was more effective to the young nymph.Nosema locustae could be propagated using cotton locust and used for Chondracris rosea management in forest with concentration of 5×107 and 1×108 sporozoite/ml, and the death rate were up to 94.9%~100%.
出处
《广东林业科技》
1996年第1期30-36,共7页
Forestry Science and Technology of Guangdong Province
关键词
生物防治
蝗虫微孢子虫
棉蝗
木麻黄
Biological control,Nosema locustae, Chondracris rosea,Casuarina equisetifolia