农作物虫情预测。BP神经网络具有对非线性复杂系统预测的良好特性，可以有效地描述其本身具有的不确定、多输入等复杂的非线性特性。-Prediction of crop pests. BP neural network has the good characteristics of nonlinear complex systems, prediction, can effectively describe the complex non-linear characteristics of the i