Stand Factors and Risk Analysis of Harm Extent of Gypsy Moths

Abstract

Twelve stand factors affecting the harm extent of Gypsy moths (Lymantria dispar) were studied. Through stepwise regression analyses, three key factors were selected, such as crown density, soil infertility extent, and forestland area. The results showed that there exists a positive correlation between soil infertility extent and the harm extent of Gypsy moths and a significant negative correlation between the other two key factors and the harm extent of this insect. Using the three key factors, a multivariate linear regression model was established by which the authors made a risk analysis of the harm extent of Gypsy moths.