Symptoms and control of fleshy watermelon in spring
Symptoms: the mature fruit is the same as the normal fruit in appearance, but it makes the sound of knocking wood when slapping, which is different from the mature melon and raw melon. When the fruit is cut open, it is found that the flesh is purplish red, infiltrating, the flesh becomes hard and translucent, and a smell of wine can be smelled at the same time. Completely lost edible value. Etiology: some people in Japan believe that 20 days after flowering, the disease is easily caused by sudden changes in soil moisture, high temperature, insufficient leaf area and other factors. The reason is that the sudden change of soil moisture will reduce the root activity, and due to some factors, the leaf is disturbed, coupled with high temperature, ethylene is produced in the pulp, which causes abnormal respiration and deteriorates the meat quality. In addition, cucumber green spot mosaic virus can also cause abnormal respiration and pulp malignant change in the plants infected with cucumber mosaic virus. Prevention measures: the preventive measures are deep ploughing, applying more farm fertilizer to maintain good ventilation; strengthening drainage in deep ditches and high beds, maintaining proper soil moisture, proper pruning, avoiding excessive pruning, and inhibiting root growth; when the leaf area is insufficient or the fruit is bare, grass shading should be covered; to prevent the spread of virus diseases, in addition to spraying insects to cut off the spread of virus, we should also pay attention to nearby toxic plants and control them in time.
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Key points of watermelon planting in spring
The main results are as follows: 1. Select the land with high terrain and good drainage as the seedbed, and add 200 grams of Bacillus cereus to the nutritious soil to disinfect the soil. 2. Prevent uneven emergence when the emergence is uneven or there is no sign of emergence, the seeds in the seedbed should be inspected. If the radicle tip of the seeds is yellow and rotten, say.
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Prevention and control of sunburn watermelon in spring
Symptoms: watermelon fruit exposed to the hot sun, the fruit surface temperature is very high, fruit tissue burns and necrosis, forming a dry scar. Etiology: sun fever is related to varieties, dark skin varieties are easy to occur, followed by barren soil in hilly areas, poor plant vegetative growth, few rattan leaves and fruit exposure.
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