What medicine does ginseng black spot disease use to prevent and cure?

What medicine does ginseng black spot disease use to prevent and cure? Please introduce that ginseng black spot is caused by Alternaria fungi infecting stems, leaves, flowers and fruits of ginseng. Airborne. There are many times of precipitation and high air humidity, and the temperature is easy to occur under the condition of 18 ℃-22 ℃, and spread to the surrounding plants. stem spots occur more than in the middle and last ten days of May, and leaf spots begin to occur from late May to early June. The peak period of the disease is from July to August. Because of the severe cold in spring this year, the accumulated temperature is not enough, so we should prepare for the prevention and control of black spot in advance. The main symptoms of black spot are water-immersed nearly round or irregular brown or dark brown spots on the susceptible leaves, which break after drying up in the later stage, and rapidly expand in case of overcast and rain, causing the leaves to wither and fall off. In the initial stage, the stem spot is oval, extended, growing strips, sunken in the diseased part, black mildew, and in severe cases, the stem is withered and lodged. After infection in the flowering and fruit stage, the fruit gradually blackens and dries up, resulting in early fruit drop, commonly known as "hanging dried seeds". To prevent and cure black spot, we should do a good job in prevention and treatment, pay attention to cultivation and management, remove the diseased plants in time, and spread raw lime powder in the disease points for disinfection, shading in time, excessive light is easy to occur leaf spots, prevent leaking rain and rain, keep the canopy ventilated, shade in time before entering the canopy, repair the canopy, and support the seedlings and wei seedlings in time before entering the Beginning of Autumn. Chemical control method: border surface disinfection: 99% carbendazim + 35% metalaxyl or 99% carbendazim + 72% agricultural streptomycin sulfate can be sprayed on the bed surface. Seedling and leaf expansion period: to prevent frost injury and stem black spot disease, choose 68% metalaxyl (Jinlei) or 50% Anke + 25% propiconazole or mixed spraying of polyantimycin and Tianda Shenbao when emergence is 30%-50%. After the leaves were fully unfolded, 25% propiconazole and Tianda Shenbao were sprayed once, which could make the plants stand upright and lift the leaves up, which was beneficial to ventilation and humidity reduction, and reduced the reproduction and infection ability of black spot pathogen. In the budding florescence, spray immediately after pinching flowers to prevent the infection of black spot pathogen from the cut-off pedicel, you can use spot + mancozeb mixed with Tianda Shenbao. With the coming of rainy season in summer, it can be sprayed with spot + oligomale Pythium, which can effectively control ginseng black spot. Click to get more ginseng planting technology click to get more medicinal material planting technology