Population increase of Larch casebearer(C. dahurica)were controlled by compre-hensive factors.Spring wind caused 27％ of larvae on crown to fa11 down.Early and late frosts,larch catempillar,sawfly and needle cast of l...Population increase of Larch casebearer(C. dahurica)were controlled by compre-hensive factors.Spring wind caused 27％ of larvae on crown to fa11 down.Early and late frosts,larch catempillar,sawfly and needle cast of larch could reduce the food quality and quantity of larchcasebearer and had indrect effects on population density. Birds,ants and spites were the mainpredators of C.dahurica. The parasite complex comprised Piermalebae,Eulophidae,Ichneumonidaeand Braconidae."Self--adjustment",of population caused by"self--population density",only runseffectively at a high larval density.展开更多
The nucleopolyhedrosis virus(NPV) of larch case bearer (Dendrolimus superans) is in quadrangle or irregular form. It's diameter is ranged from 1.21 μm to 2.33 μm. There is one or many virions in each envelope. T...The nucleopolyhedrosis virus(NPV) of larch case bearer (Dendrolimus superans) is in quadrangle or irregular form. It's diameter is ranged from 1.21 μm to 2.33 μm. There is one or many virions in each envelope. The size of the virion is about 29.1-60.5nm × 244.2-325.6nm.展开更多
文摘Population increase of Larch casebearer(C. dahurica)were controlled by compre-hensive factors.Spring wind caused 27％ of larvae on crown to fa11 down.Early and late frosts,larch catempillar,sawfly and needle cast of larch could reduce the food quality and quantity of larchcasebearer and had indrect effects on population density. Birds,ants and spites were the mainpredators of C.dahurica. The parasite complex comprised Piermalebae,Eulophidae,Ichneumonidaeand Braconidae."Self--adjustment",of population caused by"self--population density",only runseffectively at a high larval density.
文摘The nucleopolyhedrosis virus(NPV) of larch case bearer (Dendrolimus superans) is in quadrangle or irregular form. It's diameter is ranged from 1.21 μm to 2.33 μm. There is one or many virions in each envelope. The size of the virion is about 29.1-60.5nm × 244.2-325.6nm.
