Consultation: I am a farmer in Suizhong County. The autumn squash I planted has already started to go on the market, but the melons have grown a lot and are not easy to sell. I have not seen a lot of medicines, but what should I do?
Answer: This is caused by the gourd virus disease. The symptom of this disease is that dark green and light green plaques appear initially on the young leaves, the plants are short, the leaves shrink, and later wither or die. The leaf deformity on the seriously ill strain is chicken-claw-like and the melon is reduced. There are tumor-like bulges on the fruit surface, or the fruit is deformed.
The disease is caused by a single infection or combined infection of various viruses such as cucumber mosaic virus and melon mosaic virus. The virus mainly overwinters on celery, spinach, and weedy weeds, and spreads through aphids and seeds. In addition, field farming operations and inter-plant friction can also be spread through the juice.
Prevention:
1. Choose resistant varieties.
2. Seed disinfection. Seed dressing with seed weight 4 prion A powder or soaking with 10% trisodium phosphate for 20 minutes, washing and drying, and sowing.
3. Strengthen field management. Apply enough base fertilizer; in the seedling stage, in case of drought and high temperature, it must be watered to cool and moisturize, promote plant growth and improve disease resistance.
4. Early prevention. In the early stage of the field locusts, timely spraying and prevention. 50% anti-Polycarb 2000-3000 times, 40% Lego emulsifiable concentrate 1000-1500 times, 5‰ cucurbitacin 800 times solution or azadirachtin, matrine and the like can be sprayed. In addition, 10% of imidacloprid wettable powder 1000-1500 times although the control effect is good, but because the melon crop is very sensitive, it should be used with caution.
5. Chemical control. It can be sprayed with 20% virus A wettable powder 500 times, 1.5% viral spirit emulsifiable concentrate 1000 times, 3% toxic water clearing agent 300 times or 1.5% phytopathogenic emulsion 1000 times. Every 7 to 10 days, even spraying 3 to 4 times can alleviate the condition.
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