The disease is a bacterial disease caused by P. syringae pv. Cucumber leaves and melons can be victimized, severe reduction in production, it is necessary to prevent and treat it as soon as possible. Symptoms Seedlings often appear on the cotyledons water spots round lesions, slightly sunken, brown dead. The pathogenesis of adult plants begins with water-stained spots. The expansion of the lesions is limited by the veins, forming a polygonal yellow lesion. When the lesions are wet, there are obvious water-stained circles around the lesions. White pyoderma is produced and the lesions are dry. Dry cracking, perforation, which is an important feature of the difference with the leaves of downy mildew. Melon and stem lesions, the initial water stains, and then there is ulcers or rifts, and bacteria pus overflow, the disease Department was milky after dry, and cracks. Melon lesions developed deeper and later grew white mold, causing the entire melon to rot. The law of incidence Seed germination infects the cotyledon, causing the incidence of seedling stage. The pathogens are transmitted through wind and rain, irrigation, insects, and agricultural operations. The pathogens are invaded by cucumber wounds and stomata, causing epidemics. The optimum temperature for onset is 18-26°C, and the relative humidity is above 75%. Rainy summer, humidity, and severe onset. Low-lying terrain, poor drainage, and heavy land masses for many years, are more severe. Control methods 1. Agricultural control. Selection of disease-resistant varieties, such as Jinyan No. 6, Xia Qing, black oil sticks, etc. Between 2-3 years rotation with non-melon vegetables. Before seed sowing, soaking with warm water at 50°C for 20 minutes, or soaking with 40% formalin 150 times for 1.5 hours, or soaking with agricultural streptomycin 200ppm for 30 minutes, take out and allow germination after sowing. It is best to use sterile soil nutrition seedlings. Apply base fertilizer, increase phosphorus and potassium fertilizers, deepen the land, clean the countryside, and control the disease. 2. Chemical control. Can spray 72% of agricultural streptomycin 4000-5000 times, or neomycin to 150-200ppm, or 77% can kill WP 400 times, or 50% DT fungicide 500 times, or metalaxyl Manganese zinc wettable powder 500 times, spray once every 7 days or so, even spray 3-4 times. 2004-2021 New Laser Distance Sensor
Are you looking for a distance photoelectric sensor with mm high accuracy? Yes, JRT manufactured the industrial laser lidar sensor since 2004. There are different models of high accuracy sensor, high frequency distance sensors, ip54 ip65 ip67 waterproof rating etc., you can choose. The laser measuring modules, some good for outdoor using, some can be connected to your Arduino,
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