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稻瘟病是我省水稻的主要病害之一。我省双季晚稻常年因穗颈瘟和枝梗瘟的为害造成产量下降。一般年份病穗率为1—12.9％;严重年份病穗率高达80％以上,并造成大量白穗。其发生普遍、损失极大,严重地障碍着双季晚稻产量的提高。为了进一步明确穗颈瘟和枝梗瘟对产量的影响,提供损失率估计的科学依据,我们在大田调查的基础上,分别对穗颈瘟和枝梗瘟造成的损失情况进行了测定和验证。现将结果报道如下:
Rice blast is one of the main diseases of rice in our province. Double season late rice in our province perennial due to panicle blast and branch stem blast damage caused by the decline. In general, the incidence of disease spikes is 1-12.9%; in severe years the disease spike rate is as high as 80% or more, resulting in a large number of white spikes. Its occurrence is widespread and its losses are great, seriously hampering the yield increase of double-season late rice. In order to further clarify the effects of panicle blast and branch stem blast on yield, and to provide a scientific basis for estimation of loss rate, we determined and verified the losses caused by panicle blast and pest blast on the basis of field surveys. The results are reported as follows: