2005•Yunnan Forestry Science and TechnologyRequires access
The Contrast Test of Effectiveness of No.1 and No.2 Bacillus thuringiensis biological pesticides on Dendrolimus punctatus wenshanensis
Xie Kai-li, Ma Ping, Yuehong Jiang, Chai Ming-bo, XU Mei-lan, Shi Ping-lin
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Abstract
The contrast test of effectiveness of No.1 and No.2 Bacillus thuringiensis biological pesticides on the larvae of Dendrolimus punctatus wenshanensis was made in forestry. The population density of D.punctatus wenshanensis reduced by 13.6% and 54.4% after treated with No.1 Bacillus thuringiensis biological pesticide in 1 day and in 5 days respectively. The population density of D.punctatus wenshanensis reduced by 7.2% and 43.2% after treated with No.2 Bacillus thuringiensis biological pesticide in 1 day and in 5 days respectively, and there is highly significant difference both between the decline rates of population of D.punctatus wenshanensis treated with the two biological pesticides in 1 day and between those in 5 days. The population density of D.punctatus wenshanensis reduced by 79.2% and 87.6% after treated with No.1 Bacillus thuringiensis biological pesticide in 10 day and in 15 days respectively. The population density of D. punctatus wenshanensis reduced by 76.0% and 84.0% after treated with No.2 Bacillus thuringiensis biological pesticide in 10 day and in 15 days respectively, and there is significant difference both between the decline rates of population of punctatus wenshanensis treated with the two biological pesticides in 10 day and between those in 15 days. Considering the effectiveness of the two biological pesticides on the larvae of D.punctatus wenshanensis in a comprehensive way, No.1 B.thuringiensis biological pesticide took effect faster than No.2 B.thuringiensis biological pesticide,and the final effectiveness of No.1 B.thuringiensis biological pesticide is better than that of No.2 B.thuringiensis biological pesticide.