Polygonum multiflorum is a common Chinese herbal medicine, with strong vitality and high market demand. Many areas now have artificial Polygonum multiflorum planting. In the process of planting and management, there are various pests and diseases in Polygonum multiflorum. If many leaves are encountered by the growers, what is the cause? How to effectively prevent and control? Let's take a look at the following.
First, the cause of yellowing of leaves of Polygonum multiflorum
Polygonum multiflorum planting, many growers said to see the leaves gradually yellowing, serious leaves, the edge of the less obvious spots, in fact, this is mainly caused by the red spider damage, if you open the leaves of Polygonum multiflorum, red spiders up to 10 Above, it is already a serious hazard.
Second, the red spider harms the symptoms of Polygonum
It mainly harms the leaves, sucks the leaf juice behind the leaves, thereby destroying the chlorophyll, affecting the photosynthesis of the leaves of Polygonum multiflorum, and making the leaves yellow, if not controlled and repaired in time, it will seriously affect the yield of Polygonum multiflorum.
Third, the prevention and treatment method of Polygonum multiflorum
1. The climate is the basic condition for the outbreak of Polygonum multiflorum. In the years of drought and no rain, especially in April and August, it is necessary to pay attention to prevent the damage of red spiders in advance.
2, for the 2-year-old Polygonum multiflorum (has produced vines), autumn and winter seasons should pay attention to clear the field weeds, after the spring, and try to shallow ditch, these are one of the ways to reduce the normal hatching of red spider eggs.
3. If Starscream is a large-scale outbreak, it can be controlled by chemical agents. The best time to control Starscream is in the stage of eggs, cubs and nymphs. Therefore, in the year of Starscream, you should choose to kill and kill. Egg control products, such as avermectin, diphenyl phthalate tetrazine and the like. If the red spider is lighter, you can choose 1.8% avermectin 50-100 ml, 5% avermectin 20-50 ml and 30 kg of water to dilute and spray an acre field.
The control agent should be added with brassinolide + seaweed fertilizer + azoxystrobin to supplement the leaves, and the leaves damaged by red spider can achieve the purpose of repairing the leaves and promoting robust growth.
The above is about the prevention and control of Polygonum multiflorum. For this pest and disease, prevention and control must be done well, which is conducive to high yield and quality. What else do you want to add to the Polygonum multiflorum?
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