How to effectively control pests and diseases by planting litchi?

The planting area of litchi king is not large, so the output is not very high, and the market price is still expensive. If you want to grow high-yield and high-quality litchi king, you must do a good job in pest control. Litchi king has many pests and diseases. Please introduce several common and harmful prevention and control works as follows:

1. Downy mildew

When the fruit of litchi king enters the semi-mature stage or the full mature stage, it is most likely to be infected with litchi downy mildew, which will cause fruit diseases from the pedicel. With the increase of time, the scope of the disease spots will gradually expand until the litchi fruit is completely rotten and loses its edible value. The control methods are mainly to control litchi downy mildew with drugs before litchi matures, and to control litchi downy mildew with common chemicals such as 25% botrytis cinerea 800 times solution or 77% wettable powder 800 times solution.

2. Litchi stinkbug

Litchi bedbugs will gather around the tender leaves and stamens of litchi to feed and lay eggs. The young leaves and stamens that are eaten lose their original nutrition and will rot and appear brown stripes. When a large number of nutrients disappear, litchi fruit will no longer bear, resulting in a sharp decline in litchi production. The control measures can be 900 times trichlorfon or 20% pyrethrin, or feeding natural enemies to protect litchi bedbugs, such as wasps and mantises.

3. Litchi borer

Litchi moths eat litchi fruit. Eating stones at the young fruit stage leads to a large number of fruit drops. In the fruiting stage, larvae feed between the stem and the core, leaving dark brown powdery insect dung, which seriously affects the yield and quality of litchi. Protect and utilize natural enemy resources. There are many kinds of natural enemies of litchi stem borer, including spiders, ants, sandflies and so on. It can also be controlled by chemicals. Use pyrethroids and pyrethroids to kill adults and eggs, and spray once every 7 ~ 10 days.

4. Litchi geometrid

Litchi geometrid swarms, which is extremely harmful. In severe cases, young leaves and stamens of litchi can be bitten and bald. The control measures can be taken by using chemical agents, such as BT preparation 800 times, 1.8% avermectin EC 1000 ~ 1500 times, and spraying 1 ~ 3 times on the new-born ascaris lumbricoides larvae with an interval of 7 days. In addition, natural enemies can also be used for prevention and control. When litchi germinates, Trichogramma is released, 2000 ~ 3000 /667m2, 1 ~ 3 times every 2 ~ 3d.