What is ginseng phytophthora blight? A comprehensive guide to this disease
What is ginseng phytophthora blight? How do you prevent and control ginseng phytophthora blight? We ask knowledgeable readers to help explain. Zhongdiwang has compiled the damage caused by ginseng phytophthora blight and its prevention and control methods, listed in detail below for readers' reference. Damage caused by ginseng phytophthora blight: The disease directly infects ginseng roots with hyphae, or forms large numbers of zoosporangia...
What is ginseng phytophthora blight?How do you prevent and control ginseng phytophthora blight? We ask knowledgeable readers to help explainZhongdiwang has compiled the damage caused by ginseng phytophthora blight and its prevention and control methods, listed in detail below for readers' reference.
Damage caused by ginseng phytophthora blight:
The disease directly infects ginseng roots with hyphae, or forms large numbers of zoosporangia that spread to the aboveground parts and infect stems and leaves, causing disease. Wind, rain and farming operations are the main ways the disease spreads. During the ginseng growing period, the disease can undergo multiple secondary infections.
Ginseng phytophthora blight generally begins in June, with the peak period from mid-July to mid-August. When the temperature is above 20°C and soil humidity is above 50%, the disease breaks out severely. Poor ventilation and light penetration in the ginseng bed, compacted soil, excessive nitrogen fertilizer and overly high density all favor the occurrence and spread of the disease.
Prevention and control methods for ginseng phytophthora blight:
Method 1: Drain the ginseng garden promptly and ensure ventilation and light penetration.
Method 2: Maintain a suitable planting density for ginseng, remove weeds promptly, and loosen the soil around the ginseng appropriately to lower temperature and humidity.
Method 3: If diseased plants are found, remove them promptly. The removed diseased plants must be taken out of the bed and burned, and the diseased holes sealed and sterilized with 45% amobam or 20% copper acetate. Thoroughly clear diseased residues in autumn. And carry out one soil disinfection.
Method 4: The disease occurs severely and is difficult to control, so prevention must be carried out in advance. Spray control agents 3 to 5 times in succession. You can use 72.2% propamocarb hydrochloride aqueous solution at 600 times dilution; 46% copper hydroxide water-dispersible granules at 1500 times dilution; 25% metalaxyl + propamocarb wettable powder at 600 times dilution; 40% copper oxychloride + cymoxanil wettable powder at 120-160 grams per mu; 50% dimethomorph water-dispersible granules at 1000 to 1500 times dilution, etc.
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