First, choose a well-drained area for planting. Planting density should be appropriate. Select resistant varieties. The diseased leaves were immediately removed. At the end of autumn, diseased leaves and sick bodies were collected and destroyed.
The appearance is tan, and the cork is red-brown at the flaking; there are intermittent stripes on the branches, nodules are enlarged, and the shape is like a bead. Most of the hard and delicate roots and fibrous roots are born, and some surfaces are smooth and smooth, such as stalks. It is commonly known as "crossing the river branches" or "crossing bridges"; there are brown scales on the upper part, and there are residual stems or petioles that have not been cleaned at the top. The quality is firm and hard, the section is irregular, the skin is dark brown, the wood is golden, the rays are cracked, the central pith is red and yellow, and occasionally hollow. Odorless, very bitter taste, chewing saliva can be dyed red and yellow. It is better to use fat, beaded, solid, red-yellow, no residual stems and fibrous roots.
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Second, spray 50% carbendazim WP 1000 times, or 80% dexamethasone WP 500 to 700 times, or 1% Bordeaux, or 755 chlorothalonil 500 times control. Spray once every 7 to 10 days.
Aster Brown Spot Control: