Viral disease, hormone harm, prevention and treatment
There are three types of viral diseases, namely, mosaic-type, yellow-green or leaf-to-spot mottle on the leaves, transparent veins, slightly shrunken leaves, and mostly flower-faced. The fern leaf type starts from the upper leaves or partly becomes strips, and the middle and lower leaves are slightly rolled up, the petals are enlarged, forming a flower "giant", and the plants are dwarfed to varying degrees. Stripe type, mainly in the fruit and stem. High temperature, drought, locust damage, weak plant growth, heavy pods, etc. can easily cause the disease. It can be transmitted through friction, snoring, kidnapping and other operations, and can also be transmitted through locusts and machinery.
Control measures: 1 selection of disease-resistant varieties. 2 Strengthen the cultivation and management, make a reasonable rotation, remove the sick plants after harvest, and pay attention to the disinfection of hands and tools during field operations. 3 Seed disinfection, soaking with fresh water for 4 hours, remove and put in 10% trisodium phosphate solution, immerse for 20 minutes, wash and germination. 4 Spray germicide and insecticide in time.
Hormone damage
After 2.4-D (fat emulsifiable concentrate) and hormonal hormones were used in excess, the leaves of the plant growth points were curled downwards, elongated, and distorted.
Preventive measures: irrigation and soil washing, while allowing the plant roots to absorb water, increase cell moisture, thereby reducing the relative content of soil, crop body drugs, to play a role in alleviating phytotoxicity.
The combination of irrigation and fertilization for cultivating loose soil can promote root development and enhance crop recovery.
The leaves suffer from phytotoxicity and can be sprayed with fresh water several times in succession to remove or reduce the amount of pesticides and fertilizer residues on the crop leaves.
Flowers, fruits, or flowering branches may be damaged due to applicator or irrigation. Fruits and damaged shoots may be removed. If the main stem (dry) produces phytotoxicity, it should also be combined with the application of fulvic acid fertilizer or water washing and disinfection to increase the ability of the plant to resist phytotoxicity and promote the growth of crop roots.
The difference between hormone harm and virus disease
Hormonal injury can easily cause slender distortion and deformity of leaves, and it is easily confused with fern leaf virus disease, but the hormone harms the back of the leaves without oil stains, and does not change to brown, the leaves are stiff, and the thickening is not obvious, generally a large area Occurrence, this is the main feature to identify hormone phytotoxicity. Most of the virus diseases are sporadic and punctate at first, and occur in large areas in severe cases.
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