Technical Measures to Prevent and Control persimmon
In October, yellow orange orange persimmons have been placed on the shelves and are very attractive. However, people find that some persimmons have sunken black pelicans. They can even see spotted white cotton velvet. When they are peeled off, they look like active insects. This is a kind of pest called persimmon, which is also called persimmon. Cotton, persimmon felt, commonly known as persimmon, 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.
The following measures should be taken to prevent persimmon velvet: First, combine pruning, remove worm-bearing branches, scrape bark during winter, and use brush to brush over winter nymphs. The second is to spray Baume 3 to 5 degrees lime sulfur or 45% crystal lime sulfur 20 to 30 times, 5% diesel emulsion after defoliation or before germination. Thirdly, after the nymphs outbreak and the hatching of the eggs, especially during the period of the newly hatched nymphs, it is an opportune time for chemical control. Commonly used agents include culling of phosphorus, chlorpyrifos, buprofezin, phoxim, and various pyrethroids. A single agent or compounding agent. Note the use of rotation. The fourth is to protect natural enemies.
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d) 1kg*10bags/mesh bag e) 500g*20bags/mesh bag f) 250g*40bags/mesh bag
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