The main pest control of cucumber in spring greenhouse
The most common diseases and diseases of cucumber in spring greenhouses are downy mildew, powdery mildew, bacterial angular spot disease, gray mold, whitefly, and spotted fly, and in some years or in part, blight, black spot disease, and bacterial blight occur. Disease and leaf blight. 1. Downy mildew: Downy mildew is the most important disease of cucumber. It is a disease of high temperature and high humidity. Because of its rapid onset, it is also known as horse running dry. Generally, the onset is heavy from March to April in spring. The melodized leaves, polygonal brown lesions that are limited by the veins, and the grayish black (purple-black) mold layer on the back of the leaves, cause the leaves to quickly fall off until the plants die. Control can use high-temperature stuffy shed; chemical control 72.2% Prec, 72% Kelu, 69% Anke manganese zinc or 10% Coker suspension 1000 times spray, or with 45% chlorothalonil smoke agent 200 ~ 250 grams, divided into 4 to 5 places in the shed, ignited with dark fire, smoked in a closed greenhouse, and ventilated the next morning, or with 5% chlorothalonil or 10% anti-fungal agents per kilogram of acre morning or evening Spray dusting. 2. Bacterial keratoses, marginal blight and leaf blight: The main damage is the leaves. The chloroplastic yellow-green round spots appear on the front of the leaves. Lesions are thin, white, off-white, yellow, and tan. Sometimes the dry fungal pus is visible on the back of the diseased leaf. Melon, stem, and petiole lesions were nearly circular and watery, with white pus on the surface, pale gray later, and cracks in the middle. Should first do a good job of seed disinfection, the early onset of timely spraying, with 77% to kill the wettable particulate powder 500 times, 12% green butter emulsion 500 times, 47% Garnett WP 500 times. 3. Powdery mildew: also known as "white hair" disease, easy to disease on cloudy days. Powdery mildew mainly damages the leaves, petioles and vines and does not harm the fruits. At the early stage of disease, white small spots were produced on the front and back sides of the leaves, and then expanded and contiguous with a layer of white mold. The control is sprayed with 10% of World High 1500 times liquid or 40% of DuPont Fuxing 5000 times liquid; it can also be smoked with chlorothalonil. 4. Botrytis: It is a disease of low temperature and high humidity. It mainly affects young larvae, leaves and stems. The disease minister grows hairy. When the larger melon is killed, the tissue turns yellow and grows gray mold, and the mold layer turns pale gray. The affected parts of the damaged melon stop growing, rot or fall off. When rotten or rotten flowers are attached to the stem, it can also cause rot in the stem. In severe cases, the lower knots rot and cause the vine to break and the plants die. Prevention and control to control the temperature of the shed, try to increase the temperature to 25 °C ~ 30 °C, cloudy days without water, promote the use of small water irrigation under the film to the water, clear and wet. After the occurrence of gray mold, the diseased melons were promptly removed, brought out of the shed, buried deep, and burned to remove the sickness. At the beginning of the disease, 50% quick-released cycloxane, 1500-fold solution of 65% Tajirin, 40% Shijiale suspending agent 800-1000 times, and 60% anti-mildew ultrafine powder 600 times solution were used alternately. Use 2 to 3 times. The chlorothalonil smoke agent smokes 250 grams per acre, or sprays 5% chlorothalonil dust agent in the evening, 1 kilogram per acre, once every 10 days. 5. Scab: The pathogen mainly infects the growing point of the cucumber, and dark green water-soaked spots appear on the leaflets. After expansion, the spots are brown, and the cracks are star-shaped holes. In severe conditions, the melon vines ceased to elongate, the melons were flowed, the lesions were brown, and they fell slightly. The stellate cracking occurred on the melons, and the dark brown molds grew on the melons. The young fruit was bent in the direction of the lesions. Prevention must be done for the seed disinfection work, but also disinfection of the greenhouse, shed sterilization. The use of pesticides for control, with 50% carbendazim wettable powder 600 times, 75% chlorothalonil wettable powder 600 times, 10% Shijie water dispersant 3000 times, 40% Fuxing emulsion 6000 ~ 8000 times liquid , 50% acetaminophen WP 800 times liquid spray control. 6. Blight, blight, and root rot: Cucumber deaths are serious in the last two years. Fever, blight, and root rot are the main diseases that occur, especially in greenhouses where cucumbers are planted only year after year. The bacteria are in the soil. Accumulated, easy to disease. Before onset or early onset, use 5% bactericidal agent or 4% guanacomycin 120 or 50% carbendazim or 70% thiophanate-methyl or 25% anti-fukuning 400 to 500 times or 30% chrysoxime 1000 times Irrigate the roots with 0.3-0.5 kilograms per plant, or smear the diseased stems with hymexazol. 7. Whitefly: 10% imidacloprid, 25% buprofezin 1000 to 1500 times, 20% acetamiprid 3000 times, 2.5% bifenthrin (Uranus) 2000 to 3000 times, 1.8% ivermectin 1500 times liquid and other agents, the positive and negative spray control. 8. Liriomyza sativae Blanchard: In the period from the beginning to the end of adulthood, Liriomyza sativae is evenly placed on every mu of land to induce adult insects with 15 fly traps to replace it once every 3 to 4 days. The larvae were sprayed with 2.0% abamectin 2000-fold or 48% chlorpyrifos 1000-fold before 2nd instar. Chocolate Melting Machine,Chocolate Melting Maker,Commercial Chocolate Melting Machine,Commercial Chocolate Melting Maker Guangzhou New Power Catering Equipment Manufacturing Co.,Ltd , https://www.gznewpower.com