In recent years, with the widespread promotion of greenhouse vegetable planting models in Kazuo County, cucumber has become one of the major vegetable suppliers for the annual supply. However, diseases have become the main obstacle to the yield and quality of cucumbers. Therefore, how to effectively prevent and control cucumber diseases in greenhouses is a common concern for the majority of Lainong farmers. The following describes the identification and prevention of cucumber diseases in greenhouses as follows:
First, downy mildew
1 symptoms
The main damage leaves. In the initial stage, the leaves were stained with light green water. After expansion, they were confined by the veins. They were polygonal, yellowish-greenish, and brownish. The lesions merged in later stages. The whole leaves were dry and curled upward from the leaf margins. A layer of gray and black mold was born, and the leaves of the whole plant withered when severe.
2. Control methods
(1) Select disease-resistant varieties (Tsuga Collection and Jinyan Series), cultivate strong seedlings, control watering, and apply scientific fertilizers. (2) Ecological control. In the morning, when the temperature of the greenhouse reaches 30°C, the air is released, the greenhouse is closed at 25°C, the relative humidity is about 70%, the temperature of the greenhouse in the afternoon is reduced to 20-25°C, the humidity is reduced to about 60%, and the night temperature is controlled at 15-20. °C. (3) Chemical control. 72% DuPont Keluo 800 times liquid can be used to mix 58% thiazole manganite 600 times liquid or 72.2% Precloxin 600-800 times liquid, spray once every 7-10 days, successively 3-4 times. Medications can also be treated with smoke from chlorothalonil fumes. The dosage of mu is 300-400 grams.
Second, bacterial angular spot
1 symptoms
The main damage to the leaves, but also harm the stems and fruits. Leaf blade was damaged, initially in water-soaked shape, near-circular depression spot, and after the microstrip was brown and dry, when the humidity was high, a white film-like substance appeared after the white fungus was drained, and it was easy to perforate; Small spots immersed, irregular or contiguous after expansion, the Department of the Ministry of overflowing a large number of gray bacteria pus.
2. Control methods
(1) Select disease-resistant varieties, such as Jinyan No. 2 and No. 6, etc.; (2) Seed treatment without disease, and soak seeds with warm water at 50°C for 20 minutes, remove and germinate after drying, or use 40% Formalin 150 times liquid immersion for 1.5 hours after rinsing clean germination sowing. (3) Chemical control. Can use 30% DT fungicide 500 times, 47% Garethon WP 700 times or 77% can kill 600 times, spray every 7-10 days, 3-4 times in a row.
Third, gray mold
1 symptoms
The main damage flower and young melons, the bacteria first invade the flower of the open defeat, grow a light gray brown layer of mold, and then spread to the young melon, so that the rot from the umbilical rot, the disease Department of dense gray mold layer. The affected victim’s department stops growing, rots or falls off. Burnt flowers land on stems and leaves causing rotten stems, rotten leaves, and gray mold.
2. Control methods
(1) Strengthen the management of greenhouses, remove diseased leaves, sick flowers, diseased fruits and yellow leaves in time, and keep the greenhouses clean, airy and light-transmitting. (2) Promote high-mulching mulching, under-membrane under-irrigation and hose micro-irrigation technology, and strengthen ventilation to reduce humidity. (3) Chemical control. At the beginning of the disease, 50% Sulfamethoxazole 500-800 times solution was used to spray the gray mold spirit 800 times, or 50% acetaminophen WP 1500 times.
Fourth, powdery mildew
1 symptoms
Seedlings can be infected from the seedling stage to the harvest, mainly damage the leaves, the initial generation of white near-round small white spots on the leaves, after the expansion into the edge is not obvious contiguous white powder, and even the entire leaf covered with white powder, late onset, white mold Due to the aging of the mycelium turned into gray, the diseased leaves were dry, and sometimes the piles of small yellow-brown spots grew on the lesions and then turned black.
2. Control methods
(1) Selection of disease-resistant varieties, such as Jinza No.1, No.2, No.3, etc. (2) Physical control. The use of 27% high-fat film emulsion 80-100 times liquid sprayed on the leaves at the beginning of the disease to form a layer of film, not only can prevent the invasion of bacteria, but also can cause hypoxic conditions to cause the death of pathogens, spray 5-6 days, Spray 3-4 times. (3) Chemical control. In the early stage of onset, spray 15% triadimefon 1500 times liquid or 50% thiophanate-methyl wettable powder 1000 times.
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