In winter, soil and air humidity in vegetable greenhouses are significantly higher than those exposed to the ground, and they are usually continuously used for a long period of time, which provides wintering conditions for some pests that cannot overwinter in the north. Therefore, in the winter greenhouse vegetables pests and diseases appear to be more serious than exposed areas. The most common and serious diseases and diseases of greenhouse cucumbers are downy mildew, powdery mildew, bacterial angular spot, gray mold, greenhouse whitefly, and spotted fly, some years or local areas, blight, wilt, and scab And leaf blight is also biased.

Agronomic prevention and control Strengthen the cultivation and management, create environmental conditions that are conducive to the growth and development of cucumber and not conducive to the occurrence and development of pests and diseases, promote robust growth of cucumber, increase resistance to cucumber, delay and reduce the occurrence of pests and diseases. The first is scientific fertilization and the application of phosphorus and potash fertilizers to achieve reasonable application of nitrogen, phosphorus, potassium, and micro-fertilizers. The second is reasonable irrigation, change the flood irrigation to drip irrigation or infiltration irrigation under the membrane. Third, timely cultivating loose soil, enhance soil permeability, reduce soil moisture, and increase soil temperature. The fourth is to strengthen daytime ventilation and nighttime heat preservation in sunny days, and to control the temperature and air humidity in the shed. The fifth is to adopt high temperature stuffy shed to control downy mildew. In the early stage of downy mildew, the greenhouse was closed at noon on sunny days, so that the temperature inside the greenhouse was raised to 45°C and maintained at a constant temperature for 2 hours. The treatment was repeated every 7 to 10 days. High-temperature stuffy shed should pay attention to varieties of high temperature conditions and plant development, too young and not high temperature training plants should not be suddenly high temperature treatment, treatment should maintain high soil moisture, and to strictly control the processing temperature and time, After treatment, water and fertilize, restore plant growth to prevent high temperature burns and cause fruit. Sixth, diseased leaves, diseased flowers, diseased melons, and old yellow leaves are removed at any time, which can reduce the source of diseases and insect pests, as well as reduce air and humidity.


Chemical control shall be sprayed in the early stage of the occurrence of pests and diseases, and chemical control shall be implemented.

Downy mildew: In general, when the average temperature rises to 15°C and the relative humidity reaches 80%, sporadic diseased leaves should be sprayed immediately. If the environmental conditions are favorable to the onset of disease every 4 to 5 days and the environmental conditions are not conducive to the onset of disease, spray once every 7 to 10 days. When spraying carefully, the front and back of the leaf should be sprayed to protect the middle and upper leaves. If an onset center is found, it is important to control spraying. 80% Dasheng M-45, 70% mancozeb, 70% chlorothalonil, 70% EDMA, 40% georgine 800-1000, or 45% chlorothalonil 200-250 grams per mu, divided into 4 to 5 places in the shed, ignited with dark fire, smoked in a closed greenhouse, ventilated the next morning, or used 5% chlorothalonil, 10% antifungal agent per acre 1 Kilograms are sprayed in the morning or evening. Powdery mildew: At the beginning of the disease, 20% Triadimefon EC or 25% triadimefon WP is 1500 times, or 12.5% ​​diniconazole or 25% Myclobutanil WP is 3000 times, or 4% NR 120 is 500~ 600 times liquid spray.

Botrytis cinerea: In the early stage of disease, 50% procymidone (Sulfacin) 1500 times, 65% jebumycin or 50% polymyxin (Doxymil) 1000 times, 50% carbendazim or 70% are alternately used. Thiophanate-methyl spray 800 times, spray once every 7~10 days, or use 10% procymidone or 45% chlorothalonil smoke 250 grams per acre smoke, or in the evening sprinkled 5% Bacteria clearance dust agent, 1 kg per mu, spray once every 10 days or so. Bacterial keratinella and leaf blight: At the beginning of the disease, 72% of agricultural streptomycin or 1 million units of neophytin 4000 times, or 500 to 600 times of viable spores of vitilizin can be used. Or spray 1:2:300 Bordeaux mixture, spray once every 7 to 10 days, you can also use 5% chlorothalonil dust powder spray 1 kg per acre.

Blight: At the beginning of the disease, use 25% metalaxyl 600 times solution, 50% EDHM or 64% oxazamethoxazole 400 times solution, 72% urea manganese zinc (Kelu) or 70% Chlorothalonil or 40% Kyocera 600-800 times spray. In regions where resistance to these agents has occurred, 70% Antai 600-fold or 69% ank-zinc 1000-fold spray may be used instead.

Scab: At the beginning of the disease, 12.5% ​​diniconazole 2000 times solution is used, 80% of Dasung M-45 or 50% carbendazim or 70% thiophanate-methyl or 70% chlorothalonil 800-1000 times solution spray, or 45% chlorothalonil smoke agent 200-250 grams per acre smoke, smoked once every 7 to 10 days, even smoked 3 to 4 times.

Fusarium wilt: before or at the beginning of the disease, roots are irrigated with 4% agri-resistance 120 or 50% carbendazim or 70% thiophanate-methyl or 25% anti-fukuning 400-500 times, with 0.3-0.5 kg per plant. Irrigation once every 10 days, even irrigation 2 ~ 3 times.

Viral disease: If conditions allow, you can set insect nets to prevent aphids. Pharmacists can be sprayed with 10% imidacloprid or 3% acetamiprid 2000 times, or 4.5% beta-cypermethrin 1500 times, or 2.5% kung fu 3000 times. At the beginning of the disease, use 5% of mycorrhizal or 20% of virus A500 times, or of 0.5% of anti-toxic agent No. 1 300 times, or 83 times of anti-agent 100 times spray, spray once every 10 days, even 2 ~ 3 times.

Greenhouse whitefly: sprayed with 10% imidacloprid or 2.5% kung fu 2000x.

A case of Liriomyza sativae: In the period from the beginning to the end of adulthood, 15 insect-eating papers were evenly placed to kill adult worms per acre, replaced once every 3 to 4 days, and used 20% of arvicin before the second instar of larvae ( Spot sneak net) 1500 times, or 2.0% abamectin 3000 ~ 4000 times, or 48% chlorpyrifos 1000 times spray.

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