Different temperatures affect the effect of controlling pine caterpillars, Dendrolimus punctatus, by B.t pesticide apparently.While using B.t pesticide,the mortality of D.punctatus decreased as the temperature dropped...Different temperatures affect the effect of controlling pine caterpillars, Dendrolimus punctatus, by B.t pesticide apparently.While using B.t pesticide,the mortality of D.punctatus decreased as the temperature dropped.From the result of 4 temperature gradient tests,it was showed that 20 ℃ is the threshold that determine the effect of controlling D.punctatus by B.t. The results shows that different temperatures affect the feeding deterrence of the B.t to the D.punctatus larvae also,but in the all temperature treatments,the feeding deterrences are apparent consistently.展开更多
通过 B. t.与黑胸败血菌及灵菌对三龄蚕的感染力对比试验 ,初步发现三龄起蚕对 B. t.有很高的创伤敏感性 ,接种感染发病率极显著地高于灵菌和黑胸菌 ,而且病程较短 ,认为 B. t.也是家蚕败血病的一种重要病原 ,并对其药物防治作了初步探...通过 B. t.与黑胸败血菌及灵菌对三龄蚕的感染力对比试验 ,初步发现三龄起蚕对 B. t.有很高的创伤敏感性 ,接种感染发病率极显著地高于灵菌和黑胸菌 ,而且病程较短 ,认为 B. t.也是家蚕败血病的一种重要病原 ,并对其药物防治作了初步探索 ,试验表明 ,新型抗菌素 SL对 B. t.展开更多
Luseweilei is an easily-bursted microcapsule insecticide. A test of effectiveness of the insecticide to control the larvae of Dendrolimus superans T. was carried out in larch forest in Baoan Forest Farm of Nehe City, ...Luseweilei is an easily-bursted microcapsule insecticide. A test of effectiveness of the insecticide to control the larvae of Dendrolimus superans T. was carried out in larch forest in Baoan Forest Farm of Nehe City, Heilongjiang Province, in April 2001. The solutions of different concentrations (1:150, 1:250, 1:350, and 1:450 Luseweilei : water) were sprayed on the larch trunk before the overwintering larvae climbing on trees and the spraying lengths (height) designed were 1.0, 2.5, and 3.5 m high from ground. The control result showed that spraying 150-, 250-, and 350-fold solutions of the insecticide all produced a good control result, with a mortality rate of 97%, but the 450-fold solution only produced 70% mortality. It is concluded that this insecticide can be used as a kind of good insecticide to control the overwintering larvae of D. superans in spring. Spraying 350-fold solution of easy-burst microcapsule insecticide and one meter spraying length are recommended for the future application..展开更多
文摘Different temperatures affect the effect of controlling pine caterpillars, Dendrolimus punctatus, by B.t pesticide apparently.While using B.t pesticide,the mortality of D.punctatus decreased as the temperature dropped.From the result of 4 temperature gradient tests,it was showed that 20 ℃ is the threshold that determine the effect of controlling D.punctatus by B.t. The results shows that different temperatures affect the feeding deterrence of the B.t to the D.punctatus larvae also,but in the all temperature treatments,the feeding deterrences are apparent consistently.
文摘Luseweilei is an easily-bursted microcapsule insecticide. A test of effectiveness of the insecticide to control the larvae of Dendrolimus superans T. was carried out in larch forest in Baoan Forest Farm of Nehe City, Heilongjiang Province, in April 2001. The solutions of different concentrations (1:150, 1:250, 1:350, and 1:450 Luseweilei : water) were sprayed on the larch trunk before the overwintering larvae climbing on trees and the spraying lengths (height) designed were 1.0, 2.5, and 3.5 m high from ground. The control result showed that spraying 150-, 250-, and 350-fold solutions of the insecticide all produced a good control result, with a mortality rate of 97%, but the 450-fold solution only produced 70% mortality. It is concluded that this insecticide can be used as a kind of good insecticide to control the overwintering larvae of D. superans in spring. Spraying 350-fold solution of easy-burst microcapsule insecticide and one meter spraying length are recommended for the future application..
