To irrigate the roots and spray the leaves could effectively prevent and cure the black rot disease and the root and stem rot disease by Fenaminosulf diluted 1 000 times,before seedlings got lignified.

• 在苗木木质化前用根腐灵稀释1 000倍灌根和叶面喷洒能有效地防治根腐和根茎腐烂病。