Cucumbers are prone to viral diseases during the summer heat, mainly caused by three viruses: cucumber mosaic virus, melon mosaic virus and tobacco mosaic virus. Mixing often occurs during the growth of cucumber. Generally, the symptoms are manifested from the upper tender leaves, such as the appearance of mosaic leaves, thick green wrinkles, uneven bumps, fern leaves, lobes and other symptoms. If the disease is early, the plant will appear short or wilting.
The prevention and control of cucumber pests and diseases during the summer heat season should be based on the selection of disease-resistant varieties or disease-resistant varieties, and comprehensive prevention and control measures supplemented by cultivation and disease prevention.
I. Control measures for pests and diseases of cucumber seedlings
First of all, it is necessary to cultivate strong seedlings, apply more phosphorus and potassium fertilizer to improve the disease resistance of the plants; secondly, pay attention to the sanitary operation in the field, and wash the hands with soap in time after contact with the bacteria.
Pay special attention to the control of aphids, especially in the seedling stage to control aphids. When aphids occur in the field, they can be killed by imidacloprid, acetamiprid, and avermectin.
Second, the treatment of cucumber virus disease
In the early stage of viral disease, spray 20% virus A wettable powder 500 times solution or 20% virus spirit wettable powder 600 times solution, or use plant growth to inhibit the virus better. Piper acid).
Plants with viral diseases generally have growth ability. Spraying a growth regulator that significantly promotes plant growth allows the cucumber to continue to bloom even in the presence of disease.
3. Treatment measures when cucumber disease is serious
If the incidence is serious, it is recommended to use the following compounding agent spray: 0.16% anti-virulence (virus K) + 0.16% virus Becker (other drugs that passivate the virus are also available) + medical norfloxacin, virus spirit (per kilogram of water) Add 1 tablet) +0.16% zinc sulfate + natural yuncin (Jinyunda-120) or naphthaleneacetic acid 5 mg/L.
The first spray can be heavier, and after 1-2 times in succession, it can be sprayed according to the general spray method. According to the above ratio, the amount of commercial product to be added per sprayer (15 kg of water) is: 25 ml of anti-virulence, 25 g of virus, 25 tablets of virulence (morpholine), 30 g of zinc sulfate, Natural Yunzhisu 1.5 grams.
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