In recent years, with the expansion of the cultivated area of ​​thick muskmelon in protected areas and the increase of multiple cropping index, the types of diseases of muskmelon have also increased. In addition to the frequently occurring diseases, such as powdery mildew, downy mildew, and bacterial blight, the phenomenon of melon melon rot in the past two years is more serious, causing greater losses in production and even the loss of production.

First, the reason of rotten melon

1. Bacteria caused by fungi, bacteria, and diseases. The fungal diseases that cause melon melons are: Melon diseases, Sclerotinia, Anthracnose, Scab. These pathogens can survive on the seeds, soil, and diseased plant debris. They are mainly transmitted by air currents. When the humidity of the outside environment is high, they will infect again and occur in large areas. The bacterial diseases that cause melon melons mainly include soft rot of melons. These pathogens can attach to the surface of the seed and winterize diseased plant residues. They spread through rain, insects, and agricultural operations, and are infested by wounds and natural channels. °C ~ 25 °C, when the air relative humidity is heavy.

2. Calcium-induced rotten melon. Cutting the harvested fruits revealed that the flesh was rotted and lost its commercial value, which was generally caused by the lack of calcium in the soil, resulting in less accumulation of melon sugar. At the same time, excessive application of potassium fertilizer and nitrogen fertilizer will also affect the absorption of calcium by plants, resulting in calcium-depleted melons in melons.

3. Rotten melon caused by improper cultivation and management. The main ones are: (1) The seed disinfection work is not done well. (2) Planting is too dense, with poor ventilation and light transmission; excessive watering after planting has not promoted the growth of roots; partial application of nitrogen fertilizer led to overgrowth of plants, reduced disease resistance, and provided an advantageous environment for the growth of pathogens. . (3) Preventive measures are not timely enough, aggravating the occurrence of diseases.

Second, prevention and control measures

1. Remove the sick and reduce the number of bacteria in the greenhouse. After the harvest, the sick body is buried or burned in time to reduce the number of bacteria.

2. Do a good job of disinfection, cut off the spread of germs. Before sowing, the seeds should be air-dried, soaked with warm soup or pesticide, and the nutritious soil should be disinfected to prevent invasion or cross-infection of pathogens.

3. Adopt agricultural measures to increase the disease resistance of melons. Pay attention to the time and amount of watering, watering as little as possible, in order to maintain a low greenhouse humidity environment, to prevent multiple infections of bacteria, causing disease epidemic.

4. The main prevention, comprehensive control. When using plant growth regulators such as pyrrolizole, etc., add a few drops of agricultural streptomycin to the aqueous solution of pyrazole, and spray the protective bactericide (Dasheng-M45, Jinrun) in time before and after irrigation to prevent disease. To prevent and treat medication in time. During the pollination period or within 10 days after, pay attention to medication so as not to damage young larvae. In the middle and late stages of plant growth, it is possible to use bactericides such as chlorinated 2000, imported chlorinated to prevent and control, and aerosols or dusts can be used in even cloudy days.

Yongqing County Vegetable Management Bureau

Excerpted from: Hebei Science and Technology News, 2007.01.30.6 Edition

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