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】对浙江、广西和云南的褐飞虱致害性研究结果表明，１９９７年浙江虫源对ＩＲ２６和Ｍｕｄｇｏ苗期致害为９级，若虫存活指数大于５０，表明仍以生物型Ⅱ为主。广西和云南虫源均能致害抗虫品种ＩＲ２６，Ｍｕｄｇｏ，ＡＳＤ７和ＲａｔｈｕＨｅｎａｔｉ，高龄若虫在ＲＨ品种上的成活指数分别为７０．９和６６．７，说明这两个虫源产生了与生物型Ⅰ，Ⅱ和Ⅲ的致害性不同的新致害型。浙江虫源的若虫和成虫对不同抗虫品种的取食选择性有明显差异，成虫嗜食ＩＲ２６品种，而若虫对不同品种的选择性无显著差异。云南虫源若虫嗜食ＡＳＤ７，而成虫则嗜食ＴＮ１。浙江和广西褐飞虱将卵产在ＩＲ２６上，而云南虫源则产在ＴＮ１上。表明不同虫源褐飞虱对抗虫品种的取食和产卵选择性与其致害性不一致。
The results of virulence studies on BPH in Zhejiang, Guangxi and Yunnan showed that the infestation of IR26 and Mudgo in Zhejiang Province in 1997 was 9 and the nymphal survival index was more than 50, indicating that the biotype Ⅱ was still the predominant species. Insect species IR26, Mudgo, ASD7 and RathuHenati could be induced by both Guangxi and Yunnan insects. The survival indices of elder nymphs on RH cultivars were 70.9 and 66.7, respectively. Ⅰ, Ⅱ and Ⅲ different virulence of the new type. The nymphal and adult insects in Zhejiang Province had significant differences in the feeding selectivity of different insect-resistant varieties. Adults fed on the IR26 variety, while the nymphs showed no significant differences in the selectivity of different varieties. Yunnan insect nymphs eat ASD7, while adults are fed TN1. The brown planthopper in Zhejiang and Guangxi will lay eggs on the IR26, while the Yunnan insects produce on the TN1. The results showed that the feeding and oviposition preference of insect pests to different insect-resistant Nilaparvata lugens were inconsistent with their virulence.