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Cucumber Scab Control Technology
Cucumber scab is one of the major diseases of cultivated cucumbers in protected areas, and it has been designated as a quarantine disease by our city. The main symptoms: Scab can harm all parts of cucumber. Young leaves, tender stems and tender melons are the most susceptible. When the leaves are damaged, dark green water-soaked lesions are formed on the leaves, internal yellocs become stellate-like perforations, and sometimes yellowish halos surround the lesions. When invading the stalks and petioles, an oval-shaped, dark green, water-soaked, sagging lesion develops that cracks, secretes the amber-coloured jelly, and grows with a dark gray moldy layer on the lesion. Infested with growth spots, there was a bad head and clustered buds under it. The fruits and melons were infected and the legs were green and spotted at the beginning, overflowing with transparent glue, and later changed into sessile-colored blocks. The melon strips are bent from the diseased part but generally do not rot. Incidence of the disease: The pathogens of Scabs are mainly wintered in the soil with mycelia or mycelia with the diseased body, and they can also overwinter on seed coats, becoming the primary source of infection in the following year. The germs are mainly invaded by the epidermis of young leaves, fruits, stems, etc., or invaded by stomata and wounds. The temperature of pathogenic bacteria is about 17°C, and it is popular under low temperature and high humidity conditions. If the melons weigh heavily, sowing seeds, watering, dense planting, and poor ventilation and light transmission are all serious. Prevention and control technologies: 1 Agricultural methods used disease-resistant seeds: such as Jinchun No. 3, Zhongnong No. 3, No. 7, Nongda No. 14, Changchun Mimi and other varieties. Seed treatment: seed disinfection before sowing, soaking in hot water at 55°C for 15 minutes, soaking in 25% carbendazim wettable powder 300 times for 1 hour, or 0.3% of seed weight in 50% carbendazim Species. Seedbed treatment: When growing seedlings, apply 8 to 10 grams of 50% Carbendazim per square meter. The scab site of severe disease of black scab is used for every 100 square meters before planting, with 250 grams of sulfur plus 1 kg of sawdust mixing point, smoked overnight. Cultivation management: The use of sorghum mulch to increase temperature, enhance ventilation, reduce humidity, reduce condensation time, can control the occurrence of scab. 2 Chemical control The central diseased plant found in the field should be promptly removed and sprayed. Can be used 30% Teflon WP 1500 times, or 50% carbendazim WP 600 times, or 50% nellikon WP 1500 times, or 80% Captastar WP 500 times liquid. Can also be based on greenhouse humidity and weather forecast, using chlorothalonil smoke agent control, with 45% chlorothalonil smoke agent, 200 to 250 grams per mu, in the evening closed shed ignited smoke, continuous control 3 to 4 times the effect is very it is good.