How to prevent and control tomato gray mold? Introduction to the control measures of tomato gray mold
What are the special effects of tomato gray mold? Tomato gray mold special medicine This is not a versatile solution. The most important thing is that you need the farmers in the early stage of planting and controlling tomatoes. The main prevention and treatment work is done to prevent the most serious disease problems of this tomato.
[symptom performance and description]
Botrytis cinerea mainly harms fruits, and can also invade leaves and stems.
The flower is damaged to produce a gray mold layer, and the posterior stigma, ovary, and flower stalk expand, and a large number of gray-white mold layers are produced, and soft rot;
Fruit damage: Generally, starting from the residual petals, receptacles, etc., there are wet, taupe-shaped spots that gradually develop into wet rot, which develops from the sac part to the periphery, which can rot more than 1/3 of the fruit. The disease minister gave out a layer of gray hairy mold, which is the conidiophore and conidia of the pathogen.
Leaf damage: more from the tip of the leaf or the edge of the leaf, the occurrence of amorphous wet, gray-colored lesions, often "V"-shaped lesions, can cause wet rot of the leaves.
Long stem-shaped or amorphous long strips of grayish-brown lesions occur in stems, and gray mold layers grow in dampness. Severe stems and leaves above the lesions can be killed.
[occurrence law]
1. Environment:
Warm and humid is the main condition for the prevalence of gray mold. The development temperature of Botrytis cinerea is 20-23 °C, and the relative humidity requirement is over 95%. Even cloudy days, cold weather, and increased humidity after watering are prone to disease.
2. Cultivation:
Plant length, poor light transmission in the shed, and insufficient light are easy to develop. Improper management, extensive tillage, over-close planting, insufficient or excessive nitrogen fertilizer, late kidnapping of the collar, untimely release of moisture after irrigation, irrigation on cloudy and rainy days, application of unfertilized farmyard manure, diseased fruit and diseased leaves are not cleaned up in time. .
ã€Prevention】
According to the experience of some farmers' friends for many years, the following key periods can be achieved, and effective prevention and control can be achieved.
1. Qingyuan is very important:
First, the land-saving money is clearly smashed and the leaves are reduced, reducing the source of bacteria;
Second: high temperature sterilization before greenhouse planting: can use summer leisure season, closed greenhouse, temperature mentioned above 45 degrees, lasting 2-3 days, you can kill the sterilization source; or sulfur fumigation, 40 square meters 350 grams of sulfur And 500 grams of sawdust placed in the basin, sealed fumigation;
The third is: timely removal of diseased leaves, flowers, and fruit.
2, rainy (snow) days before prevention:
Gray mold is a low-temperature and high-humidity disease. It is forbidden to fill the water before the rainy (snow) weather. Avoid flooding the water, so as not to cause excessive humidity. Spray the medicine before the rain and snow according to the weather forecast: Musong No. 1 and 2 of Fu Nong Road number.
3. Rainy (snow) day management:
The temperature is about 20 degrees, the light is insufficient in cloudy and rainy days, the humidity of the protection ground is large, the ventilation is not timely, the humidity is over 90%, the condensation time is long, and the gray mold disease is easy to spread. At this time, the spraying should be avoided to prevent the humidity from increasing again. In addition, ventilation should be carried out on time. As long as it does not cause the temperature drop in the shed, it is necessary to ventilate, but the time is shorter. According to the weather conditions, it can be ventilated for 1-3 hours at noon to control the disease and occur. If gray mold occurs, it can be Take a fuming agent such as: Su Keling.
4, treatment management after the rain:
After the rainy days, spray the No. 1 and No. 2 of Fu Nong Road, and use them alternately. The spray should be comprehensive, no dripping is appropriate, and the flowers and young fruits are also sprayed in place.
5. Daily field management:
Planting in greenhouses is to take measures such as ridge cultivation, plastic film mulching, and watering under the membrane to reduce moisture and rejuvenate the plant body, enhance disease resistance and increase yield. Reasonable close planting, to prevent excessive density, resulting in poor ventilation and poor light transmission; timely fork, picking the lower old leaves; often scrub the shed film, keep the shed film clean, improve light transmission. At the flowering stage, flowers can also be added to the anthers such as kelican or chlorhexidine.
The above is the whole content of the tomato gray mold caused by Xiaonong.com, including the symptoms of tomato gray mold and the medication problems and measures in the prevention and treatment process. Farmers who need it can come to the reference!
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