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１９９０年－１９９２年在南宁市两县一郊共测试１２个品种６５块田水稻主要病虫复合损失率，建立了早、晚稻多病虫为害产量损失的多元二次模型．经卡方测验，两模型精度较高，基本反映了多种主要病虫与产量损失的真实关系．利用建立的早、晚稻多病虫为害产量损失模型，研究稻纵卷叶螟、稻飞虱、稻瘿蚊、稻蝽类、纹枯病复合防治指标，通过计算机模拟寻优．得到并修订这四虫一病的防治指标．经过１９９３年在南宁市１３１．２９万亩水稻综防区验证，新指标有明显的推广价值．
In 1990-1992, the compound pests and diseases losses of 65 rice varieties in 12 varieties were tested in two counties and one suburb of Nanning. A multiple quadratic model was established for early and late rice pests and diseases loss. After chi-square test, the accuracy of the two models is high, basically reflecting the true relationship between the major pests and yield losses. Based on the model of yield loss caused by early and late rice pests and diseases, the composite control indexes of rice leaf roller, rice planthopper, rice gall insect, rice stink bug and sheath blight were studied and optimized by computer simulation. Get and amend the prevention and treatment of these four insects disease indicators. After 1993 in Nanning City, 131.29 hectares of rice comprehensive prevention zone verification, the new index has obvious promotional value.