褐稻虱在武育粳2号上不同生育期危害对水稻产量结构的影响

Effect of Nilaparvata lagens (Stal) infection on rice yield components in different rice growth stages of wuyu gen-2

通过试验测定在武育粳2号上水稻拔节期正处于幼穗形成阶段，受褐稻虱危害实粒数减少，产量下降；孕穗期较耐褐稻虱危害，有明显的补偿作用；孕穗末期至灌浆初期为水稻受害最敏感的时期，危害后使结实率和千粒重均明显下降，水稻显著减产；灌浆后期至乳熟期受褐稻虱危害主要导致干粒重降低，且越接近成熟产量损失越低。

The result showed that tbere existed different respondences to Nilaparvata lugens (St-ai) infection in different rice stages. In the stem longation stage,during which panicle initiates, therice yield would decrease by reducing the number of fu1l grains when the rice plants were infected byNilaparrata lugcns (Stal). In the booting stage rice plant could tolerate to the damage of Nilaparpatalugcns (Stal) and expressed a significant compensation. From late heading to early milking stage, theplants were most susceptible to the pest. Nilaparpata lugens (Stal) infection mainly made the grainweight drop.