论文部分内容阅读
纹枯病、稻瘟病、白叶枯病是我省水稻的三大病害。近两年来,由于气候反常,夏秋雨水偏多,气温偏低,日照偏少,易于发病,加之杂交稻推广,氮肥用量增加,更有利于三病流行。纹枯病几乎遍布全省各稻区,其中以平原、河谷地带、坝区受害较重。据测定,轻病损失一二成,重病损失三成以上,平均每亩损失稻谷30斤以上。稻瘟病主要在丘陵山区为害,一般损失二三成,重者达五成以上。近年个别地区稻瘟病已开始感染杂交稻“汕优二号”。白叶枯病主要在平原及河谷稻区为害,前些年狠抓了综合防治,病害有
Sheath blight, rice blast, bacterial blight is the three major diseases of rice in our province. In recent two years, due to the anomalous climate, summer and autumn rainfall is too low, the temperature is low, the sunshine less than normal, easy to disease, coupled with the promotion of hybrid rice, nitrogen use increased, more conducive to the prevalence of the three diseases. Sheath blight almost all over the province of rice, including plains, valleys, dam area heavier. According to the test, one or two percent of the patients suffered a serious illness, and more than 30% of the serious illness lost more than 30 pounds of rice per acre. Rice blast is mainly harmed in hilly and mountainous areas, with a general loss of 20% to 30%. In recent years, rice blast in some areas has begun to infect the hybrid rice “Shanyou 2”. Bacterial blight mainly in the plains and river rice area damage, pay close attention to a comprehensive prevention and control in previous years, disease