一、产生的因素 1.虫害白穗:水稻孕穗期或抽穗扬花期,由于茎部或节间被害虫(二化螟、三化螟等稻螟)钻蛀茎秆或咬断节间,抽穗前造成枯心株,抽穗后造成白穗。 2.病害白穗:导致水稻白穗的病害有稻瘟病(茎瘟、穗瘟、粒瘟等)、白叶枯病等。如稻瘟病茎瘟可造成整个穗部不能灌浆形成白穗。穗瘟形成枝梗病变可使部分穗粒变白导致空壳秕粒。白叶枯病、窄条叶枯病发病严重时,穗茎部和枝梗产生褐色条斑,造成穗茎枯死,形成秕粒产生白穗。 3.低温白穗:在枝节孕穗 First, the production of factors 1. Pests spikes: booting or flowering at the ear stage, as the stems or internodes by pests (striped stem borer, Borer borer and other rice borer) Drilling stalks or cut off internodes, heading Caused before the strain, after heading caused by white spike. 2. Diseases white spike: lead to rice white spike disease rice blast (stem blast, head blast, grain blast, etc.), bacterial blight and so on. Such as blast can cause the whole panicle can not grouting white spike formation. The formation of panicle blast disease can make part of the grain panicle led to the shell shell tablets. Bacterial blight, narrow leaf blight incidence serious, stems and stems spike brown streaks, resulting in dead stems spike, the formation of spikelets produce white spike. 3. Low temperature white spike: in the branch section booting