Potato anthracnose symptoms
After the leaves were infected, the color of the leaves became lighter, and the top leaves were slightly re-rolled, and the whole plant was wilted and browned. In the underground roots, the cortical tissue from the ground to the potato block is decayed, easily peeled off, the lateral roots are partially browned, the roots are necrotic, and the diseased plants are easily pulled out. Infected stems: many gray small grain east spots, many black granules in the base cavity of the stem.
Potato anthracnose harm and diagnosis
Near the harvest period, dark gray to brown lesions appeared at the base of the stem, and soon, the surface of the lesion was dense with black small spots. On the surface of the roots and stolons, small black spots are also born or dense. After storage, in the spring, the surface of the potato showed a round to oval concave lesion with a diameter of 2-6 mm and a depth of 0.7-1.5 mm. Central umbilical induration, slightly elevated.
Pathogen and occurrence regularity of potato anthracnose
Anthracnose is a fungus of the genus Hymenoptera. It mainly uses mycelium to overwinter in seeds or sick bodies. When the conditions are suitable in the following year, conidia are produced, which spread by rainwater splash. Spores sprout to produce sprouts that invade through wounds or directly. In the late growth stage, the pink viscous substance produced on the lesion contains a large amount of conidia, which is transferred to the sweet potato by rainwater sputtering for reinfection.
Because the seed potato can carry bacteria, disease-free plots or fields that have never been planted with potatoes, it may be ill after sowing the diseased seed potatoes. The incidence is high under high temperature and high humidity conditions. In the middle and late stages of potato growth, there is more rainwater, and it is easy to accumulate water after the rain. The field management is extensive, and the plants lacking fertilizer and water shortage have a poor growth.
Potato anthracnose prevention and treatment method
1. Strictly select seed potatoes and implement disease-free potato planting. Before sowing, you can use 25% charcoal WP 600 times liquid or 70% methyl thiophanate WP 600 times liquid soak seeds for 5-10 minutes to kill germs. .
2. Pay attention to cultivation and disease prevention, choose loamy soil with fertile soil, and remove sick bodies in time. Add organic base fertilizer to avoid high temperature and high humidity conditions and water accumulation in the field.
3, the initial stage of the disease to prevent and control the drug, you can choose 40% polysulfide suspension 400 times solution, or 25% Shi Baoke wettable powder 1200 times solution, or 10% Shigao water dispersion granules 6000 times solution, or 25% charcoal Trane WP 600 times solution, or 40% Baike EC 2000 times solution, or 30% times emulsifiable concentrate 2000 times solution, or 2% added rice water 800 times solution, or 6% Le must plough WP 1500 Double liquid, or 25% enemy de-euro 1000 times liquid, or 50% carbendazim wettable powder 400 times liquid, or 5% Tianan water agent 500 times liquid, or 70% methyl thiophanate WP 600 times liquid Spray, control once every 7-10 days, continuous control 2-3 times. 50% thiophanate-methyl WP 500 times solution, 50% carbendazim WP 800 times solution, 80% anthrax hydrazine WP 800 times solution, 70% thiophanate-methyl WP can also be used. 1000 times liquid plus 75% chlorothalonil wettable powder l000 times liquid, the control effect is better than the above-mentioned fungicide alone.
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