Persimmon velvet is a common pest of the northern persimmon trees. It sucks plant sap, and in addition to harming the fruit, it also harms shoots and shoots, starting with yellow-brown dots and gradually expanding into dark spots. When the number of gregarious animals is large, the tree vigor is reduced, resulting in falling flowers. Severely affects the normal growth of the persimmon tree.
The body size of the adult female persimmon is about 1.5 mm, about 1 mm for males and about 0.4 mm for eggs. The worms and eggs are all purple in color. The back of the adult has a white felt-like shell, and the eggs are also hidden under the shell. This makes it difficult for the medicine to touch the body. Its nymph body is about 0.5 mm long, purple-purple, and has short spiky protuberances around its body. Since it has not yet formed a shell, it is easily killed by drugs. Persimmon velvet has poor mobility and is fixed in one place for a lifetime. This provides ample time for prevention and control.
Persimmon is overwintered by the first instar nymphs in the cortex of the cortex of 2 years or more, the dry persimmon, and the rough skin gap of the trunk. In Shandong Province, four generations a year occur. The nymphs of each generation are basically from June to September. One generation occurs in the middle of each month. The former two generations mainly injure persimmon leaves and shoots, and the latter two generations injure persimmon fruits. Around the middle of October, the fourth generation of nymphs passed winter.
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