The Formation and Preventive Measures of Malignancy of Watermelon Clam
In recent years, the occurrence of malignant transformation of watermelons and locusts (commonly known as watermelon skewers, water red leeks, etc.) has become more serious. Diseased watermelons have lost their food value, and many fields have suffered from onset and even harvest. Guagua farmers have suffered heavy losses. At the peak of the disease, watermelons in greenhouses usually occur after the end of May, and most of them are in July and August.
When the disease began, the flesh around the seeds became watery and gradually turned purple, and later the whole guava became purple and finally ulcerated.
The optimum temperature of watermelon fruit development period is 25-30 °C, below 18 °C will appear thick, hollow or deformed phenomenon, the temperature of 45 degrees Celsius will cause fruit cell protoplasm coagulation. If the temperature is too high or the sunlight is exposed, it will cause adverse effects on the fruits, cause the fruits to produce physiological lesions, and hinder metabolic functions such as photosynthetic products and water transportation. This is the main cause of the malignant transformation of watermelon quails. It is also prone to produce fleshy fruit when it is cloudy on a sunny day, wet and dry drastic changes, thin and thin melons, or viral diseases.
Prevention of malignant transformation of watermelon meat quality: 1, to properly grasp the temperature inside the watermelon greenhouse, especially after the summer, the temperature of the greenhouse naturally rises, can not be high temperature and boring ripening, according to the actual situation to increase ventilation, when necessary Implement day and night ventilation. 2, to avoid direct sunlight on the fruit. Can be covered with fruits or weeds. 3, pre-cultivation strong seedlings, to prevent the harm of aphids and other pests, to prevent the occurrence of virus disease, late spraying calcium and other high-quality leaf fertilizer to supplement trace elements, extend the leaf functional period. 4. Turn the fruit over (but not turn the watermelon 180 degrees at a time), so that the fruit receives light evenly, which also helps to improve the quality of the fruit. 5, to prevent drastic changes in the soil, especially in the later stages of growth should be balanced water supply and proper control of water supply. As long as the measures are effective, it is not difficult to avoid the malignant transformation of watermelon pods.
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