There are three kinds of diseases in watermelons, such as wilt, anthracnose and viral diseases. China Pesticide Network Xiaobian introduces you to specific prevention methods:
Control of watermelon wilt disease: chemical control should be carried out in four periods, such as when transplanting seedlings, before opening female flowers, during young melons, and one week before harvesting, 5% bacteria can be used to clear 1000 times solution, 70% carbendazim or A Base rubbing solution 800 times liquid, 50% sensitized zinc 800 times liquid, or spraying, while paying attention to the use of chemicals.
Watermelon anthracnose prevention and treatment: timely removal of diseased leaves in the early stage of the disease, spray protection, spray once every 7 to 8 days, even spray 3 to 4 times. Commonly used agents are: 50% thiophanate WP 500-700 times solution; 50% bactericide carbendazim WP 500-700 times solution; 65% daisen zinc WP 500 times; 50% dexamethasone 1000 times liquid or Bordeaux mixture (1: 0.5 to 0.8: 300 to 320).
Watermelon virus disease prevention and treatment: (1) diluted with viral amide 1000 times and streptomycin (content 72%) per 5 grams of water mixed with 20 kg spray. (2) Using the virus, 15 grams of water should be mixed with water 500-600 times, and sprayed on the foliage after stirring. Spray once every 2 days and spray 2 or 3 times. The above two kinds of pesticides are added with some foliar fertilizers for better spraying. (3) It is better to use Bordeaux liquid spray. Dosage: 60 kg water + 0.25 kg copper sulfate + 0.4 kg quicklime (60: 0.25: 0.4). Dissolve half of the water of lime and copper sulphate first. Pour the copper sulphate solution slowly into the lime solution before application. It is used now and sprayed after 3 pm. Note that the young fruit can not be sprayed.
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