The Prevention and Cure of Four Main Diseases and Pests of Cucumber in Shed
In recent years, the types of cucumber diseases in greenhouses have been increasing year by year, which have caused various degrees of damage to production. Now we introduce the disease conditions and prevention and control experiences of several diseases and pests for your reference:
1. The initial stage of bacterial keratopathy is the appearance of fresh green water immersed spots, which gradually turns light brown. The lesions are polygonal by the veins, grayish brown or yellow-brown, and when the humidity is high, the leaves overflow with milky white muddy waterdrops. Bacterial pus, with white marks after drying, the disease is brittle and easy to perforate. The lesions on stems, petioles, and fruits were water stained round spots, white mucus when wet, and white after drying.
Control can be used for 70 °C constant temperature dry heat sterilization seeds for 72 hours (seed moisture content must be below 10%), or with 50 °C ~ 52 °C warm water soaking for 20 minutes, and then soaked with water for 3 hours after sowing germination. In the early stage of disease, the use of agricultural streptomycin soluble powder 1000 times or 30% DT Fungicide 500 times more liquid or 5% chlorothalonil dust 1000 times spray, control effect is higher.
2. Fusarium wilt is extremely viable and can survive in the soil for 5-6 years. High temperature and high humidity are favorable conditions for the occurrence of Fusarium wilt. Diseases occur quickly when the soil temperature is between 25°C and 30°C at a temperature of 24°C-27°C. Excessive nitrogen fertilizer, acid soil (pH = 4.6 to 6) is more severe. The incidence of nematode-rich plots and flooded plots is heavier.
In addition to the selection of disease-resistant varieties, we can adopt crops with non-melon vegetables, green onions and other crops for more than 3 years to reduce the accumulation of pathogens in the soil; or in the early stages of disease, use 50% carbendazim for wetability. Powder 500 times or 70% thiophanate-methyl wettable powder 800 times spray. Or use 70% of the dexamethasone WP 1000 times solution or 50% rig dry net 800 times to irrigate the roots, each irrigating 250 ml, irrigating once every 7 days for 3 consecutive times. At present, grafting is an ideal method for preventing cucumber wilt disease. The specific method is to use rootstock with low temperature and resistance to blight blackcurrant pumpkin as rootstock, cucumber as scion, by grafting or docking, excellent disease prevention effect, control effect can be More than 95%.
3. At the early stage of the onset of downy mildew, yellow spots irregularly appearing on the leaf dorsal or leaf margin. As the disease progresses, the lesion gradually expands and is restricted by the veins to form a polygonal yellow spot. When the disease is severe, the small lesions merge into large lesions. In the wet conditions, the back of the lesion grows a layer of gray and black mold. Diseased leaves develop from bottom to top, and the leaves of the whole plant die when they are severe.
In terms of prevention and control, we must first apply the base fertilizer, increase the application of phosphorus and potassium fertilizers, cultivate strong seedlings, water the membrane and reduce the number of watering. Strengthen ventilation and reduce air humidity. The second is chemical control, which can be specifically selected from 25% of Rhizoctonia WP 800 to 1000 times, 90% of Epimedium WP 500 to 600 times, 75% of chlorothalonil WP 500 to 600 times, 72% Kelu wettable powder 600 ~ 800 times liquid, 72% Pu Liqin liquid 600 ~ 1000 times liquid spray: You can also use 20 to 30 grams of chlorothalonil smoke agent per acre every time. Every 7 to 10 days once medication, continuous control 3 to 5 times.
4. The root knot nematode cucumber root knot nematode symptoms mainly in the root, mild symptoms of the disease strain is not obvious, serious disease strains are shorter, poor growth, poor fruiting, wilting at noon under drought conditions. Pulling up the diseased melons will result in the emergence of necrotic root nodules of different sizes on the lateral roots or fibrous roots. Some appear beaded, making the roots thicker and dissecting the root knots, revealing a small milky white nematode in the diseased tissue.
Prevention and control can be used to deepen the sun, idle irrigation, increase the application of decomposed organic fertilizer and other methods, cucumber nematode during the growth period, use 50% phoxim EC 1500 times or 30% Jiasheng Microcapsule suspoemulsion 500 times Irrigation 0.25-0.5 kilograms per strain of irrigated liquid, usually irrigation 1 time.
Dingmin Pharmaceutical supply Pazopanib API and Pazopanib Intermediates with high purity and best price. The main products CAS No are as follows: 635702-64-6, 635702-60-2, 6973-09-7. Sample can be sent if you request.COA will be along with the quote. Tech pack can be offered.
Welcome to do business with us. Please email to us directly.
Pazopanib Intermediates
Cas 635702-64-6,Pazopanib Intermediates,Pazopanib Hcl
Shijiazhuang Dingmin pharmaceutical Sciences Co.,Ltd , https://www.dingminpharma.com