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黑点病(Pyrenochaeta oryzae Mi-yake)在我国尚未见有报道,1974年玉林地区开始发现为害,当时仅科字号品种受害严重,现在一般常规品种和杂优组合均有不同程度的发生,病害有逐年扩大蔓延趋势。受病稻株,轻的影响谷粒充实,重的倒伏、枯死。据了解,1977年玉林县早造受害面积达几万亩之多,一般的减产1—2成,严重的减产4—5成。一、病状一、病状水稻黑点病在玉林地区早晚两造均有发生。水稻生育后期,主要侵染叶鞘,也侵染叶片和颖壳。病斑长椭园形,长达一寸左
Pyrenochaeta oryzae Mi-yake has not been reported in our country. In 1974, Yulin area began to find damage. At that time, only the branch number varieties suffered serious damage. Now the general varieties and heterosis combinations have different degrees of occurrence, Expand the trend of spreading year by year. Affected by rice plants, light affect grain full, heavy lodging, dead. It is understood that as early as 1977, Yulin County, as many as tens of thousands of acres of harmed area, the general cut 1-2 percent, a serious cut 4-5%. First, the symptoms First, the disease Rice black spot disease in the Yulin area sooner or later two have occurred. Late rice growth, the main infection leaf sheaths, also infected leaves and glume shells. Lesions long elliptical, up to an inch left