In winter and spring, the temperature is low. Greenhouse eggplant is prone to infectious diseases such as mites and gray mold. This disease has a wide range of hazards and brings a lot of economic losses to growers. The key to prevention and treatment of cotton blight and gray mold is early prevention and early treatment.
First, symptom recognition
Cotton blight: all stages of growth can occur. In the seedling stage, the base of the stem is water-stained, which develops rapidly, often causing tripping, causing the seedling to die. In the adult stage, the leaves are sick, producing water-stained irregular lesions with obvious wheel marks, but the edges are not obvious, brown or purple-brown, and a small amount of white mold grows on the lesions when wet. The stem is damaged by water-stained contracture, sometimes broken, and has white mold. After the flower was infested, it was brown and rotten. The fruit is the most seriously damaged. The primary water-stained round small spots, the edges are not obvious, slightly concave, and rapidly spread to half to the whole fruit. The diseased fruit department is yellowish brown or brown, gradually shrinking and softening, and wrinkles appear on the surface. When the humidity is high, the disease minister is covered with a dense white flocculent layer. In the later stages of the disease, the fruit will fall off or dry and shrink into dark brown and brown fruit.
Botrytis cinerea: The eggplant disease is most likely to occur in the greenhouse during the low temperature period. Flowers, fruits, leaves, stems and other parts can be infested, mostly from residual stigma or petals. The young fruit is the most vulnerable. The general insects produce water-stained brown lesions from the top of the fruit and its vicinity. When expanded, it is dark brown, sag and rot, and a gray mold layer is formed. Most of the leaves form a water-stained light brown lesion from the leaf margin. After expansion, they are round or oval lesions and densely covered with gray mold. The stems and branches are infected, and most of them are infected from the wounds or the residual flowers. The gray mold layer is densely covered, and then gradually penetrates into the stems, causing the stems and leaves of the diseased parts to wilted.
Second, the law of incidence
Cotton blight: In the early stage of the greenhouse, the bacteria from the diseased bodies in the soil are infested. Re-infection mainly comes from a large number of sporangia from the diseased fruit minister. It is spread by wind and rain and irrigation water, and the disease can be re-infected many times. High temperature and high humidity are conducive to disease development. Generally, the temperature is 25 to 35 ° C, the relative humidity is 85% or more, and the surface of the blade is dew condensation, and the disease develops rapidly and severely. Large water flood irrigation, shed film dripping, management extensive, partial application of nitrogen fertilizer, planting too dense, continuous cultivation, etc., will also aggravate the spread of disease.
Gray mold: The initial source of infection in the greenhouse comes from pathogens in the soil. The conidia produced on the diseased tissue spread with airflow, watering, and farming activities, forming reinfection. Infested the petals after flowering, and then invaded the fruit to cause disease. Diseased petals fall off the leaves, stems, and shoots can also cause disease. Low temperature, low light and high humidity are the main factors causing the occurrence and spread of gray mold. In the winter and spring seasons, if there is continuous continuous snow and snow, the light is insufficient, the temperature is low, the humidity is large, the condensation is serious, and gray mold is easy to occur.
Third, prevention and treatment recommendations
1. Prevention
It is best to spray the medicine before the cold current or after the cold current. 7 to 10 days of spraying, even spraying 2 to 3 times.
Prescription 1: 72% frozen WP 1 3 bags (33 grams), or 50% WP 1-3 bags (33 grams) + 50% WP 1/3 bags (33 grams) ), or 50% Bao Zhengqing WP 1 bag (15g), or 40% Shi Lele suspension 1/3 bottle (33g) + Liguo é“ 1 bag (25g), 1 sprayer water (15 Kg, the same under) spray.
Prescription 2: Fuse combination 1 set (50 g) + 50% Yuet WP 1/3 bag (33 g), or 50% Shi Lele suspension 1/3 bottle (33 g) + plant life source 1 Small bag (30g) spray on 1 sprayer water.
2, treatment
In the early stage of the disease, the diseased leaves and diseased fruits are removed in time and taken out of the shed for proper treatment. First use 24% Mingzan suspension agent 25 ~ 33 grams (3 ~ 4 machine water per bottle) + 50% Yue purchase wettable powder 1/3 bag (33 grams) + 50% Bao Zhengqing wettable powder 1 bag (15 Gram + Calcium 1 bag (10 g), spray on a spray of water.
3 to 5 days after the first dose, 30% syrup suspension agent 25 to 33.3 grams (3 to 4 machine water per bottle) + 50% Bao Zhengqing WP 1 bag (15 g) + 40% ash Le Suspending Agent 1/3 bottle (33 g) + plant life source 1 sachet (3 g) to 1 sprayer water spray.
After 5-6 days after the second drug, 1 set (50 g) + 72% frozen WP 1/3 bag (33 g) + 50% Yuet WP 1/3 bag (33 g) + 40% Shi Lele Suspending Agent 1/3 bottle (33 g), spray on a spray of 1 spray.
Spray requirements: the pesticide should be diluted twice; the spray pressure should be sufficient, the atomization should be good; the leaves and the back of the leaves should be sprayed.
When the stalk of eggplant plague disease is first onset, it can be used with 15% of frozen WP, dissolved in 0.5 kg of water, and then mixed with flour to form a paste. After scraping off the scar on the lesion, apply the ointment.
When the eggplant gray mold is in the early stage of the stem, 50% of the baggage WP can be used, 5 grams of 40g or 40% of the ash fungic suspension, 0.5kg of water and flour to prepare a paste, and gently scrape off the lesion. After the scar, the paste liquid can be evenly applied to it, which can effectively control the death of the diseased part or above.
At night, every 2 rooms can be used with 20% grayscale wood-free smoke agent 1 sachet. After 10 o'clock, the smoke is prevented and the next day is ventilated.
The above is the greenhouse eggplant blight disease, gray mold prevention and control methods, I hope to help you, want to know more about agricultural knowledge, please pay attention to the Hui Nong School!
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