桑天牛发生与环境的关系及预测模型

Relation between Occurence and Environment for Apriona gerari and Itsestimation Models

通过河北省易县２９个乡、镇的全面调查，搞清了桑天牛发生情况。应用数量化理论Ⅰ分析了桑天牛发生程度与自然、社会、经济等多个因子的关系，桑天牛发生与地形、有无桑园呈正相关，与海拔呈负相关、同时建立了桑天牛发生程度预测模型。

With the investigations in 29 townships of Yixian COunty,Hebei province,Occurence situation ofApriona germari was made clear,The relation between the occurence degree of the insect and the factors ofnature,society and economy were studied.The result showed that the occurence of the insect positively rela-ted to topography and exsistance of mulberry field,and negatively related to the elevation。Meanwhile,the esti-mation models for the occurence degree of the insect were established。