1. Brown spot: brown spot is mainly harmful to the leaves. At the beginning, there are small spots on the leaves, which are round in shape and gray green in color. After serious, the spots begin to form large patches, which are gray brown, eventually leading to dry leaves and leaves.
2. Black spot: at the beginning of the disease, the leaves begin to fade down, forming a round spot with a contour but not obvious. In the later stage, the spores that turn gray brown will also volatilize.
1. Aphids: aphids will be densely distributed on the stems and leaves, sucking the juice inside, causing the stems to dry up and lack of water, thus causing signs of falling off.
2. Leaf diving beetle: this kind of insect will damage the leaves in the larva and adult stage. The larva mainly dives into the epidermis of the leaves, resulting in the damage of the leaves, and a large number of leaves begin to dry and scorch. Adults bite the leaves, causing irregular spots on them.
1. Disease: the prevention and control of the disease is mainly divided into two parts. First, the treatment of the diseased leaves is to cut off the diseased leaves and then destroy them together. Second, spray chemicals, spray a little chlorothalonil and carbendazim in time after the onset of the disease.
2. Insect damage: after finding insect damage, enough attention shall be paid to it. If the number is small, the insect shall be removed artificially first and spraying shall be carried out.
