In recent years, the types of diseases of cucumber grown in greenhouses have been increasing year by year, which has caused various degrees of damage to cucumber production. Now, several disease conditions and some prevention and control experiences of common diseases have been introduced for reference by farmers.
The initial stage of bacterial keratopathy is a fresh green immersed lesion that gradually turns light brown. The latter lesion is limited by the veins and is polygonal, gray-brown or brownish. When the humidity is high, white mucus overflows from the leaves and the posterior stem is dry. White marks, brittle and easy to perforate. Lesions on stems, petioles, and fruits were round spots with water spots, white mucus when wet, and white marks after drying. Prevention: The seeds can be sterilized at a constant temperature of 70°C for 72 hours (seed moisture content should be below 10%), or soaked in warm water of 50°C-52°C for 20 minutes, and then soaked in clean water for 3 hours to sow germination. In the early stage of disease onset, it was sprayed with 1000 times of agricultural streptomycin wettable powder or 30% DT fungicide 500 times spray.
Fusarium wilt is extremely viable and can survive in the soil for 5 to 6 years. High temperature and high humidity are favorable conditions for the occurrence of Fusarium wilt. Diseases occur faster when the temperature is 24°C～27°C and soil temperature is 25°C～30°C. Excessive nitrogen fertilizer, when the soil is acidic (pH 4.6 to 6), the incidence is heavier. The occurrence of root-knot nematode-infested plots and flood-fed sites is heavier. Prevention and control: In addition to the selection of disease-resistant varieties, it is possible to adopt crop rotation with non-melon vegetables for more than 3 years to reduce the accumulation of pathogenic bacteria in the soil. In the early stage of disease, use 50% carbendazim WP 500 times or 70% thiophanate-methyl WP 800 times, or use 70% Dukesson WP 1000 times to irrigate the roots. 250 ml, irrigation once every 7 days, and irrigation 3 times. At present, grafting is an ideal method for preventing cucumber wilt disease. The specific method is to use rootstocks with well-developed roots, low temperature resistance, and wilt-resistance as the rootstock, cucumber as the scion, and grafting or plugging. The effect of disease prevention can reach 95%. .
In the early stage of the downy mildew, irregular spots with light yellow irregular shapes appear on the back of leaves or leaves. As the disease progresses, the lesions gradually expand and are limited by the veins to form a polygonal yellow lesion. When the disease is severe, small lesions become large lesions. In the wet condition, the back of the lesion grows a dark gray moldy layer. The disease progressed from the bottom to the top, and the leaves of the whole plant withered when severe. Prevention: To apply adequate base fertilizer, appropriate application of phosphorus and potassium fertilizer to cultivate strong seedlings, watering under the membrane to reduce the number of watering. Strengthen ventilation and reduce air humidity. Chemical control can choose 25% Rui
Poison mildew WP 800 to 1000 times, or 5% chlorothalonil wettable powder 500 to 600 times, or 72% Kelu wettable powder 600 to 800 times, or 72% Pleake water 600 to 1000 times liquid spray. Each can also use 20-30 grams of chlorothalonil smoke agent each time.
The root knot nematode disease cucumber root knot nematode symptoms mainly in the roots, mild symptoms of the disease strain is not obvious, serious disease strains are shorter, poor growth, poor fruit. Pull up the diseased melon, you will find the roots or fibrous roots have different sizes of tumor root knot. Some root knots appear beaded, making the roots thicker, and dissecting the root knots, revealing a small milky root knot nematode in the diseased tissue. Prevention and treatment: Deep-turning soil can be used, watering at leisure, and decomposing organic fertilizer can be applied. Root knot nematodes occur during the growth and development of cucumber, and 50% phoxim EC may be used to irrigate the roots at 1500 times. Each strain may be 0.25-0.5 kg.
The initial stage of bacterial keratopathy is a fresh green immersed lesion that gradually turns light brown. The latter lesion is limited by the veins and is polygonal, gray-brown or brownish. When the humidity is high, white mucus overflows from the leaves and the posterior stem is dry. White marks, brittle and easy to perforate. Lesions on stems, petioles, and fruits were round spots with water spots, white mucus when wet, and white marks after drying. Prevention: The seeds can be sterilized at a constant temperature of 70°C for 72 hours (seed moisture content should be below 10%), or soaked in warm water of 50°C-52°C for 20 minutes, and then soaked in clean water for 3 hours to sow germination. In the early stage of disease onset, it was sprayed with 1000 times of agricultural streptomycin wettable powder or 30% DT fungicide 500 times spray.
Fusarium wilt is extremely viable and can survive in the soil for 5 to 6 years. High temperature and high humidity are favorable conditions for the occurrence of Fusarium wilt. Diseases occur faster when the temperature is 24°C～27°C and soil temperature is 25°C～30°C. Excessive nitrogen fertilizer, when the soil is acidic (pH 4.6 to 6), the incidence is heavier. The occurrence of root-knot nematode-infested plots and flood-fed sites is heavier. Prevention and control: In addition to the selection of disease-resistant varieties, it is possible to adopt crop rotation with non-melon vegetables for more than 3 years to reduce the accumulation of pathogenic bacteria in the soil. In the early stage of disease, use 50% carbendazim WP 500 times or 70% thiophanate-methyl WP 800 times, or use 70% Dukesson WP 1000 times to irrigate the roots. 250 ml, irrigation once every 7 days, and irrigation 3 times. At present, grafting is an ideal method for preventing cucumber wilt disease. The specific method is to use rootstocks with well-developed roots, low temperature resistance, and wilt-resistance as the rootstock, cucumber as the scion, and grafting or plugging. The effect of disease prevention can reach 95%. .
In the early stage of the downy mildew, irregular spots with light yellow irregular shapes appear on the back of leaves or leaves. As the disease progresses, the lesions gradually expand and are limited by the veins to form a polygonal yellow lesion. When the disease is severe, small lesions become large lesions. In the wet condition, the back of the lesion grows a dark gray moldy layer. The disease progressed from the bottom to the top, and the leaves of the whole plant withered when severe. Prevention: To apply adequate base fertilizer, appropriate application of phosphorus and potassium fertilizer to cultivate strong seedlings, watering under the membrane to reduce the number of watering. Strengthen ventilation and reduce air humidity. Chemical control can choose 25% Rui
Poison mildew WP 800 to 1000 times, or 5% chlorothalonil wettable powder 500 to 600 times, or 72% Kelu wettable powder 600 to 800 times, or 72% Pleake water 600 to 1000 times liquid spray. Each can also use 20-30 grams of chlorothalonil smoke agent each time.
The root knot nematode disease cucumber root knot nematode symptoms mainly in the roots, mild symptoms of the disease strain is not obvious, serious disease strains are shorter, poor growth, poor fruit. Pull up the diseased melon, you will find the roots or fibrous roots have different sizes of tumor root knot. Some root knots appear beaded, making the roots thicker, and dissecting the root knots, revealing a small milky root knot nematode in the diseased tissue. Prevention and treatment: Deep-turning soil can be used, watering at leisure, and decomposing organic fertilizer can be applied. Root knot nematodes occur during the growth and development of cucumber, and 50% phoxim EC may be used to irrigate the roots at 1500 times. Each strain may be 0.25-0.5 kg.
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