1·The others such as previous crops, sowing way for maize, cropping system and the climate were indirect factors, which affected the sowing date or amount of planthopper.
前茬作物、播种方式、耕作制度和气候条件等都通过影响玉米的播期或灰飞虱的发生数量来间接影响当地或当年病害发生的轻重。
2·There were obvious differences on math-morphological feature from images of the Whitebacked rice planthopper fed on the 4 rice varieties, besides the area of posterior wing.
各品种上的白背飞虱的数学形态特征，除后翅面积无显著差异外，其它均有一定的差异。
3·It is suggested that virulence of rice brown planthopper was variable and the character of variety resistant or susceptible to insect was the exterior factor of virulent shift.
这表明褐飞虱的致害性是可变异的，水稻品种抗、感虫特性是其转化的诱因。
4·The metabolic resistance of the brown planthopper, Nilaparvata lugens, to buprofezin and metamidophos was investigated in this article.
说明褐飞虱对这两种药剂的代谢抗性机制存在差异。
5·The reflectance of rice plant damaged by the brown planthopper(BPH, Nilaparvata lugens) was measured using an ASD handheld spectroradiometer.
利用手持式光谱仪测定了褐飞虱为害后稻株的光谱反射率。