Common diseases of watermelon and their control

Watermelon is one of the favorite fruits of many people, but watermelon itself is very fragile. It is not only very sensitive to the surrounding environment, but also encounter many diseases in the process of growth, which may harm the whole watermelon field if not careful, so what are the diseases that harm watermelon? The following editor will tell you about several common diseases of watermelon.

1. Watermelon blight

Watermelon blight usually occurs in the hot rainy season, watermelon drainage system is poor, planting is too dense will cause. It harms the roots and stems of watermelons and, in serious cases, affects leaves, fruits and vines. In the root neck disease, there will be dark green plaques, plaques will develop around the stem, so that the stem rot, and finally lead to the whole plant withered. The symptoms of leaf fruit are similar to those of vines. Disease-resistant varieties, such as Qiong Xue, can be selected before sowing. Do not rotate with melons and fruits and vegetables after the watermelon field is harvested. Diseased melons should be removed in time to prevent infection. When there is a melon disease, it can be sprayed for prevention and control. For example, frost urea, manganese, zinc, etc., are sprayed once a week for about a month.

2. Watermelon leaf blight

Watermelon leaf blight is a common disease of watermelon, which has a high incidence in spring and autumn, mainly due to more overcast and rainy weather. Leaf blight mainly harms leaves, followed by vines and fruits. Most of the disease occurs on the young leaves, and irregular brown patches are produced on the young leaves, which continue to grow and cause the leaves to wither. When the disease occurs on fruits and vines, the fruits and vines will rot. There are varieties with special resistance to leaf blight on the market, such as Zhengza 7 and so on. After harvest, attention should be paid to cleaning up the diseased melons and burning them centrally. Establish a good drainage system for watermelon land and pay attention to rain prevention in cloudy and rainy weather. Before the disease spot is not produced, Sukeling wettable powder can be used for spray control, which is also a week, spraying for a month or so.

3. Watermelon Fusarium wilt

Fusarium wilt usually occurs at the time of result. The seedlings will stand up and wither, withering the whole leaves and turning the roots of the vines rotten to brown. It is mainly because the bacteria enter through the root wound, grow in the cells, secrete Pectinase and other substances to destroy the cells, resulting in catheter blockage unable to transport water and nutrients. The best way to control Fusarium wilt is to graft watermelons onto crops that are not prone to Fusarium wilt, such as gourds. The varieties resistant to Fusarium wilt on the market are Xinong No. 8 and so on. If you want to prevent Fusarium wilt, you can rotate water-based crops in watermelon fields, because Fusarium wilt survives in water for only more than 100 days. Finally, choose soil that is rich in nutrients and do not use fertilizer with diseased remains.

4.Botrytis cinerea of watermelon

Botrytis cinerea is caused by the invasion of Botrytis cinerea, especially in the rainy season in the south. It is mainly harmful to leaves, fruits and stems, resulting in gray irregular patches on the leaves, which eventually lead to wilting. Grey patches will also be produced on the fruit stem, so that the fruit stem can not grow normally and produce abnormal fruit. Botrytis cinerea is the most serious disease of watermelon, which can lead to all deformities of the whole land and can not be sold. Edible Wuyisin water agent and Fangmaibao wettable powder are sprayed once a week for about a month. Crop rotation should be at least 4 years and rich organic manure should be used.

5. Watermelon powdery mildew

Powdery mildew mainly occurred in southern autumn, which mainly harmed the leaves and generally had no effect on the fruit. Many small white particles are produced on the leaves, which will rob the leaves of nutrition, making the leaves unable to grow normally and causing the leaves to turn black. The cause of powdery mildew is mainly related to temperature, humidity and density, so we should pay attention to the temperature and humidity of watermelon. Reasonable arrangement of watermelon drainage system and planting density, pay attention to drainage after rain, fertilization is mainly organic fertilizer. Powdery mildew is mainly a prevention.

The above five are common diseases of watermelon, among which we should pay special attention to Botrytis cinerea, because Botrytis cinerea is difficult to control and control, if not treated in time, it will lead to no yield and no harvest. In fact, the disease has a lot to do with temperature, humidity and density. As long as it is reasonably controlled, the probability of disease will be much less.