害虫危害程度的预测,比发生期和发生量的预测更为困难。它受发生期、发生量、危害习性与寄主植物特性及生育期等多种因素的综合影响,而害虫和寄主植物本身又都受气候因素和生物因素的影响,因此对害虫危害程度的预测要从各方面综合起来考虑。 Predicting the extent of pest infestation is more difficult than predicting the occurrence and occurrence. It is affected by the combined effects of occurrence, amount, damage habits and host plant characteristics and growth period and other factors, and pests and host plants themselves are subject to climate factors and biological factors, so the prediction of pest damage Considered from all aspects.