Recently, a group of cows in the village of Nanzhai Town, Qianyang County, Shaanxi Province, wrote a letter from a group of cows. They said that every summer, the plum trees grown at home are darkened and shrunk, and the fruits that did not fall dry and are still hanging on the trees. Several times a year The medicine also does not work. This disease also causes harm to the surrounding persimmon trees and apricot trees.
To this end, the reporter interviewed Chen Lin, vice president of the Plant Protection Association of Shaanxi Province. He analyzed that Li Shu was susceptible to pests and diseases in the case of poor management conditions, light affected the development of the tree, poor fruit quality, and low yield; The tree has a short life span and the fruit is inedible. The pests and diseases of Lishu mainly include stem pests (Heaven, etc.), plum moths, locusts, red spider mites, plum red spot disease, bacterial perforation, and fluid injection.
Li Shugan pests (Cattle)
The root larvae of the plum tree are usually bee worms. After Li Shu picks fruit, the harmful effects of dried grasshoppers will be exacerbated, especially in adult trees. The main pests that damage plum trees generally are Xing Tian Niu and Mulberry, and their larvae feed on trunks, branches and roots.
Control methods: 1 hook to kill: with a wire hook, the first hole in the hole sawdust, insect excrement, and then use the wire hook to kill the larvae in the borehole. 2 scraping the skin: combined with the hook to kill the Lishu split skin, skin scraping off, and together with the dead branches, residual fruit concentrated burning in the park to kill the eggs. 3 Sealing: First saw out the wood chips and insect excrement in the borehole, then use 50% of the emulsion liquid of dichlorvos emulsion on the cotton, and stuff it into the borehole. Immediately seal the borehole of the aphid with yellow slime to kill it. Adults and larvae. 4 spray irrigation: take 50% of dichlorvos emulsion 1000 times liquid 5 ~ 10ml or 20% speed kill Ding EC 700 ~ 800 times liquid 5 ~ 10ml, remove the sprayer nozzle, the liquid spray directly to the fresh manure discharge excrement Hole inside. Note: Plum is sensitive to omethoate and cannot be used. In addition, we can still use cuttings "poisonous", trunk injection and other methods.
Plum sweetheart
Plum fruit borer is a lepidoptera leaffly insect pest, and it is the most serious pest that damages the plum fruit. The victim's fruit often shed teardrop-like pectin at the wormhole, which can no longer continue to develop normally, gradually turning reddish purple and falling off. Because its insect road is covered with red insect waste, it is also vividly called "red bean filling."
Control methods: The key period of prevention and control of P. przewalskii larvae is the age of each generation, the prosperous period of spawning, and the first mature larvae. Spray 90% trichlorfon 0.8% solution, 50% malathion 1% solution, and 50% dichlorvos 0.8% solution. Physiological fruit drop before plum, under the crown of the general application of 15% 50% phoxim 1% ~ 1.5% solution. At the end of flowering stage (95% drop), when the small fruit is of grain size, spray the first medicine, use dichlorvos, kill the enemy, kill the dicamba, and letrifinone, and spray once every 7-10 days. From the perspective of comprehensive prevention and control, biological preparations can also be used to treat the soil under the canopy, such as Beauveria bassiana. After the fall, the fruit should be removed to reduce the source of insects in the following year.
Red spider
The red spiders that damage plum trees are mainly adults and nymphs of red spider mites, sucking leaves and germinating sap. The new sprouts cannot germinate. When the leaves are seriously damaged, the whole leaves turn yellow and fall off. Li Shu, who was seriously injured, not only failed to mature the fruit of the year, but also greatly influenced the formation of flower buds and the output of the following year.
Control methods: 1 The control of dormancy period of plums: The purpose is to do everything possible to reduce the population base number. The fruit trees were sprayed with 5% olein emulsion and 3 to 5 degrees lime sulfur before germination. In addition, before the germination of plums in the early spring, combined with the prevention and control of other pests, the main skin and the main branches were completely scraped off and the rough skin was burned. 2 Prevention and treatment of the plums after germination: During the overwintering period of the females, the first generation of eggs can be controlled when hatched. The 30-degree lime sulfur can be used to dilute the water with 0.8% solution or 20% trichloroethylammonium WP. 0.6 % to 1% solution, 40% omethoate emulsion 1.5% to 2% solution, 20% desflurence 2% solution, 20% dicofol or 50% bromine bromide 1% solution were sprayed. All kinds of acaricides should be used interchangeably to prevent the emergence of insect resistance and improve the control effect.
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