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采用病、虫2因素3水平完全区组试验,结合病虫分类抽样测产,研究纹枯病(ShB)和二化螟(SB)二代复合危害关系及进行产量损失测定。结果表明,水稻纹枯病与二化螟二代存在复合危害关系,百穗重损失率大小依次为ShB+SB>ShB×SB>SB>ShB;ShB+SB≈1.41。田间损失率大小依次为ShB>ShB×SB>SB。
A complete block test of disease and worm with 2 factors and 3 levels was carried out to investigate the compound hazard relationship of the second generation of the sheath blight (SB) and the second generation stem borer (SB) and the determination of the yield loss. The results showed that the sheath blight of rice had a composite hazard relationship with the second generation of Chilo suppressalis (Walker), the loss rate of spikes per panicle was ShB + SB> ShB × SB> SB> ShB; ShB + SB≈1.41. The rate of field loss is ShB> ShB × SB> SB.