褐飞虱为害对水稻产量结构影响的研究

Studies on the Damage of Brown Planthopper to Yield Components of Rice

采用标准虫态分期连续接虫方法,研究了褐飞虱为害对水稻产量结构的影响。结果表明,褐飞虱为害可造成水稻有效穗数和实粒数减少、千粒重下降,并皆最终导致产量降低。分蘖期是穗数减少的敏感生育期;灌浆开始以后为影响千粒重的敏感生育期。褐飞虱为害早期需达到较大的虫口数量才能造成水稻有效穗数和实粒数显著减少。灌浆期水稻只要遭受一定虫晕为害即可引起千粒重显著下降。相同虫量下不同起始受害时间及同生育期稻株不同虫量造成的损失均有显著差异。水稻被害时间越早,受害时间越长、虫量越多,造成的产量损失越大。

The damage of brown planthopper (BPH)(Nilaparvata lugens) to yield components in rice had been studied. The results showed that number of effective panicles, number of filled grains per panicle and 1000-grain weight of rice could be reduced by the damage of BPH and finally, the yields of rice were decreased. Number of effective panicles and number of filled grains per panicle were reduced remarkably only in the high population densities of BPH and damaged in the early season. The sensitive growing period of rice for effective panicle reducing of BPH damage was tillering stage. But, 1000- GW was declined significantly as long as at filling stage. The sensitive period of 1000-GW reducing was in the stages after initially filling. The difference of yield loss caused by BPH was singnificant with different growth stages to be damaged in the same population density of BPH or different population densities of BPH in the same period. The yield loss was increased more in the earlier damage season and with larger density of BPH.