Lotus root spoilage disease, also known as blight and rot disease, is one of the most common and serious diseases in lotus root planting areas. The disease mainly harms the underground stems and roots, and causes the yellow leaves in the upper part of the ground, and the heavy ones wither, and the disease occurs under the conditions of high temperature and continuous rain at 23 to 30 °C.
There is no obvious symptom in the early stage of sputum. In the late diseased stems, lotus whip and roots, the brown to purple lesions appeared, and the diseased stems were longitudinally shrunk. The transporting structure of the lotus whip also turned brown and the roots were necrotic. The leaves of the diseased sputum became pale, the first leaf edge appeared green and dry, and then the inside expanded, and finally the whole leaf curled and burned. The field is seriously affected, and the whole field is a yellowish, burning like a fire. When you look at it, you can see the pink sticky substance (the pathogen conidia). The prevention methods are as follows:
1. Reasonable rotation and fertilization. Implement a reasonable rotation for 3 years, select the disease-free polders to keep the seeds, practice winter ploughing before planting, and plow again before the spring planting; use the decomposed manure, pigs, and cows.
2. Plant disease-resistant varieties, such as Elian No. 5 (3735).
3, soil disinfection, can be mixed with 50% of carbendazim or 50% of keeling 2 kg per acre of fine soil.
4, the seedling disinfection can be used 50% carbendazim wettable powder 500 times liquid immersion for 1 to 2 hours or with 50% carbendazim wettable powder and 75% chlorothalonil wettable powder and clear water 1: 1: 800 mixed liquid The spray was covered with a plastic film and sealed for 24 hours, and dried to be planted.
5. In the early stage of the disease, spray the lotus stem with 50% carbendazim WP 500 times and 0.2% neutral detergent powder, once every 3 to 5 days, even spray 2~3 times or 5~6 months (onset period) 77% of the acres can kill 3 kilograms, or 1500 to 2000 times of the copper chloride solution, or 500 kilograms of new kilograms per acre.
Anesthesia Medical Co., Ltd. , https://www.medicaldiverse.com