The problem of melon rot in the greenhouse is a prominent problem in the current planting of melons, which often causes great economic losses to melon farmers.
First, the path of spread and spread of germs
The main pathogens of melon melons are fungi and bacteria.
The fungal diseases that cause rotten melon are: blight, sclerotia, anthrax, blight, and black spot disease. These pathogens can survive on seeds, soil, and plant diseases. Temperature and humidity conditions are suitable for mass reproduction and spread of invading plant leaves and fruit surfaces.
The bacterial diseases that cause melon melons include: bacterial fruit rot and bacterial angular spot. These pathogens can attach to the seed surface, soil, and plant residues to overwinter. Through rain, insects, and agricultural operations, contact and spread through wounds and natural channels to infect at 22 °C -28 °C, when the humidity of the outside environment is heavy, the disease, especially bacterial fruit rot become the first enemy of melon production.
Second, the incidence of factors
1. Climate factors. Canopy melon fruiting period is more rainy, cloudy, less sunshine, poor ventilation and ventilation, watering in the shed is not timely, and high humidity and low temperature cause poor plant growth.
2. Planting factors. Year after year, we do not attach importance to disinfection in the shed, and do not pay attention to prevention in advance. Excessive drug use, excessive use of hormones, etc. cause rotten melon.
3. The reason for the seed. Seed disinfection is not strict, resulting in high seed-borne rates.
4. The quality of the shed film is not high, and the light transmittance and atomization are not good. Failure to pull the tuyere in time can cause rotten melon.
Third, prevention and control measures
1. Agricultural measures. Choose good varieties with strong disease resistance and marketability; use a good transparence film; melon requires more potassium, nitrogen and phosphorus, more sensitive to calcium, magnesium, boron and other elements, apply 8 cubic meters of chicken manure per acre. , diammonium 75 kg, compound fertilizer 100 kg, potassium sulfate 60 kg, with the application of biological fertilizers to prevent the invasion of diseases; after planting, according to the growing trend of plants, the night temperature of not less than 15 °C within the shed, during the day is not higher than 35 °C, It is generally controlled at 28°C-32°C during the day and draws air on cloudy days.
2. Chemical control. (1) Disinfection of the shed body. Due to bamboo shoots, cement pillars, iron wires, and walls, there may be pathogenic bacteria in the collection and concealment. There are pests such as aphids, leaf miners, whitefly, etc., and disinfection of the shed body before planting can effectively kill pests and diseases. (2) Soil disinfection. Use 35% ground bacteria to mix with fine sandy soil once spread and plow. (3) Seed treatment. Seeds are air-dried, hot-smeared, or soaked before sowing. Such as using 55 °C warm water, 150 times carbendazim or 200 times chlorhexidine soaking. Disinfection of pruning tools when disinfecting soils and field operations. (4) After planting, when the main vine grows normally, use fool generals, bacteria pioneers, agricultural streptomycin, chlorothalonil and other foliar fertilizers to spray it once every 5-7 days to prevent it in advance. When the fruit is set, the dumplings are sprayed on sunny mornings when covered with sheds, and the best fruit surface bags are conditional. (5) When using a fruit-setting assisted pollination, the liquid prepared on the day is used up on the same day. The vessel should be clean. It is best to use cold water. Injecting a few drops of agricultural streptomycin plus chlorothalonil in the pollination liquid can effectively prevent the fungus. , bacteria infection from the flower.
Packing Net or Glass Bottle Net
Packing Net,Packaging Nets,Packaging Net,Fruit Packaging Net
Changzhou Satidi Import and Export Co., Ltd. , https://www.czguanjiechuck.com