比较研究了当年采自田间的褐飞虱种群与上一年虫源在室内越冬繁殖种群对不同抗虫品种的致害性差异。
The virulence characteristics of brown planthopper, Nilaparvata lugens Stal, from paddy field population and greenhouse population collected in late rice field last year was compared.
结果表明：不同的黄秋葵品种，其生育期、形态特征有一定的差别，单位面积的产量存在着显著的差异，各品种的抗病性及抗虫性都比较强。
Results indicated among different okra varieties, there were difference in their morphology and growing time, the output of unit area have great significance.
由于抗虫品种抗虫机制及其遗传背景的差异，褐飞虱在不同的抗虫品种上致害性转化的进程和速率亦不同。
The course and rate of the shift of virulence differed from different resistant varieties as a result of their diversities in both resistant mechanism and genetic background.
但少数品种随着苗龄的增大，其抗虫性有不同程度的提高。
However, the resistant level in a few of rice varieties increased along with the increase of plant age.
但少数品种随着苗龄的增大，其抗虫性有不同程度的提高。
However, the resistant level in a few of rice varieties increased along with the increase of plant age.
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