Abstract:

12 stand description factors affecting the harm extent of the Gypsy moth(Ocneria dispar) was studied,through stepwise regression analysis from which three significant ones were selected:crown density, infertile extent of soil and forest area.The results showed that a direct correlation exists between infertile extent of soil and the harm extent of the gypsy moth,a significant inverse correlation exists between the other two key factors and the harm extent of this insect.Using the three key factors a multiphase linear regression model was made for risk analysis of the harm extent of the gypsy moth.

Key words: Typhlodromus bambusae, Experimental population, Development and reproduction, Temperature