How to prevent and cure cucumber gray mold? Gray mold is one of the common diseases in the process of planting cucumber. However, in recent years, the disease has become more and more serious, which makes the cucumber fruit often rot due to the infringement, which seriously reduces the quality and yield of cucumber. Today, Xiaobian comes. Talk about how to prevent cucumber gray mold.
First, the damage of cucumber gray mold
1. Most of the gray molds are invaded from the female flowers that have been defeated. The female flower buds that have just been damaged will have water-stained lesions, and then slowly grow the gray-brown mold layer, causing the female flowers to soften and shrink. And decay, and gradually spread to young melons.
2, the invaded young melon begins to yellow, then white mold, the color gradually turns pale gray, the young melon will stop growing after being infested, appear soft, rot and shrink, until the rotting off.
3. The invaded leaves will have water-stained lesions at the beginning, and then become irregular hazel lesions, especially in the marginal part, a small amount of gray-brown mildew lesions will appear, in a high-humidity growth environment, The lesions spread rapidly and form large lesions with a diameter of 15-20 mm.
4. After the stem vine is infested, the stem is rotted, and the vine is broken, causing rotten sputum.
Second, the prevention and control of cucumber gray mold
Cucumber gray mold is mainly based on prevention.
1, timely pruning
Because gray mold is easy to infect other diseased bodies, planters should cut off sick flowers, sick leaves, and sick melons in time, and take them out of the countryside to destroy them.
2, control temperature and humidity
Since the temperature of the gray mold is higher than 26 degrees, the incidence of gray mold is relatively high. Therefore, the planter needs to control the temperature in the greenhouse to be above 26 degrees, and the humidity in the greenhouse is controlled below 90%. When the temperature in the greenhouse is higher than 30 degrees, proper windproof operation should be carried out; when the temperature is lower than 20 degrees, the greenhouse vents should be closed to avoid the nighttime temperature being too low; if it is rainy weather, the ventilation openings should be opened in time to reduce Humidity in the shed.
3, control lighting
If the demand for light during the growth of cucumber plants cannot be met, it will also cause gray mold, because the light has an inhibitory effect on the spores of gray mold, and the light transmittance can be appropriately increased, and gray mold can also be effectively prevented.
4, the correct management
Covering the surface of the greenhouse soil can not only reduce the humidity in the field, but also reduce the surface condensation and leaf spitting time. It is also an effective method to reduce the infection of the bacteria, but it should be noted that it is not possible to water when watering. Flood irrigation can not be watered on cloudy days, because it will increase the humidity in the greenhouse, which is not conducive to the prevention and control of gray mold.
5, drug prevention
a. Use the same kind of probiotics, use 20-25 grams to 30 kilograms of water for spray control. The bacterium is suitable for human and livestock, fish and natural enemies with low toxicity, safe for crops and environment, so it is especially suitable for production. Pollution-free vegetables and green food.
b. Protozoa has the function of systemic permeability, with various functions such as prevention, protection and treatment. The use of the genus Pythium can have a good control effect, although the Pythium glutamate can withstand the scouring of rain, even if the next two hours after spraying can not affect the effect, but need to pay attention to When using the genus Pythium, it can not be mixed with other pesticides and has synergistic effect.
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