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水稻恶苗病徒长苗有 3个显病高峰 :稻苗 3叶期、拔节初期、破口初期 ;徒长苗又有明显的症状隐蔽现象。症状隐蔽始于秧龄 13d时 ,高峰发生于水稻分蘖盛期 :武育粳 5号与寒优10 2 7分蘖盛期的症状隐蔽率分别达 92 .6% ,89.7%。部分症状隐蔽病苗又会重新转化为徒长苗 ,其转化高峰发生于水稻拔节初期、破口初期。未出现症状隐蔽的徒长苗及移栽 15 d后出现症状隐蔽的徒长苗均在水稻抽穗前陆续死去 ,部分栽后 15 d内进入症状隐蔽状态的徒长苗可以成穗。适时施肥 ,尤其是增施有机肥料 ,能明显提高病苗成穗率 ,减少损失
There are 3 peak in rice seedling disease: the 3-leaf stage of rice seedlings, the early stage of jointing, the early stage of breakage; the bare seedlings have obvious symptoms of concealed phenomenon. The symptom concealed began at 13 days of seedling age and the peak occurred in the tillering stage of rice: the concealment rates of symptoms of Wuyujing 5 and Hanyou 10 2 7 were 92.6% and 89.7% respectively. Some of the symptoms of hidden disease vaccine will be converted back to leggy seedlings, the peak of its transformation occurred in the early stages of rice jointing, early break. Acuase seedlings without hidden symptoms and 15-year-old recalcitrant long seedlings with symptoms were transplanted before rice heading stage. Some of the legumes with hidden symptoms in some 15 days after transplanting can become spikes. Timely fertilization, especially by adding organic fertilizer, can significantly increase the rate of disease into spike, reduce losses