The leggy seedlings which did not show symptom hiding and which showed symptom hiding 15 days after transplant died all successively before early earing. A part of leggy seedlings which entered into symptom hiding state within 15 days could form ears.

• 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。