In the winter, the greenhouse is closed for a long time, and the humidity in the greenhouse is high. Loofahs are most vulnerable to anthracnose, brown spot, and blight, because these three diseases are fungal diseases. Symptoms in the leaves are similar, some vegetable farmers Difficult to identify, but these three diseases are different from each other, and are easily misdiagnosed, often causing difficulties in prevention and treatment. Therefore, we must pay attention to distinguish them and carry out targeted prevention and treatment.
Anthrax disease occurs from the leaves of the seedling stage, and the lesions are nearly round, dark brown in color and have rosy patterns. The later lesions developed into irregular shapes; the lesions on the petiole were yellow-brown, oval-shaped, and the lesions were sunken.
Brown spot mainly damages the leaves, and the lesions are brown to gray-brown. The lesions are round or irregular. There are sometimes faded green to yellow halos at the edges of the lesions. The lesions are dry at the late stage and easily broken.
Leaf lesions on leaf blades were nearly round brown or dark brown patches. The lesions on the melon strips were round or irregularly shaped lesions with brown edges and grey white areas. The lesions on the stems are elliptic to spindle-shaped, brown on the edges, gray-brown on the middle, and sometimes the lesions overflow with amber-colored transparent gums, and the stems of the stems are dead. The disease can also harm loofah flowers, which can cause the water edge of the loofah flowers to rot. In severe cases, it may flow like pus and sometimes smell. Late dry, dry burnt flowers, petals are not fresh. The onset of young melanocarpus was mostly black rot.
After raining in the rain and snow, the humidity in the shed was high and the three diseases were serious. During the prevention and control, it is necessary to reasonably control the temperature and humidity in the shed, implement rotation for crop rotation, increase application of organic fertilizer and phosphorus and potassium fertilizer, strengthen ventilation, increase translucency between plants, and reduce the application of nitrogen fertilizer.
To prevent anthrax, it can be sprayed with 80% anthrax 800 times or 25% carbonate 500 times; control brown spot can be sprayed with 50% for 600 times, or 47% for Garrett 600 times; Sprinkling can be sprayed with 75% chlorothalonil 500 times solution or 1200 times power or 100 times 100g. At the same time, when these three diseases are controlled, 50% of the protection work can be sprayed with 1200 times liquid and DT600 times liquid together.
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