1. feature

The seedlings were infested before and after unearthing, and the roots of the seedlings were rotted and brown. When the seedlings were severe, they caused rotting buds and dead seedlings. When the disease was light, the seedlings were yellow and thin, and the development was poor. The adult root, root neck, rhizome and sacral base are dry rot, brown or reddish-brown, and the discolored parts can also develop from the root neck to the base of the stalk, form a base rot, and when wet, the base sheath of the root neck and stem base White to light mycelium and conidial spores are formed between the stem and stem.

2. Hazardous object

False grass, bluegrass and other grass species.

3. Control methods

(1) Increase P and K fertilizers, control N fertilizers in spring and summer, and reasonably apply water. (2) carbendazim, thiophanate-methyl and other agents control.

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