Potato early blight late blight prevention technology
Early blight of potato produces nearly round brown to dark brown lesions on the leaves, with black concentric ring veins and a small amount of black mold on top, with yellow halos outside the lesions; stem lesions are similar to foliar lesions; tubers Dark brown round lesions or irregular lesions were formed, slightly sunken, and the dry rot beneath the lesions turned brown. Late blight of potato mostly occurs from the tips of leaves or leaves with water-saturated chlorotic spots. When the weather is wet, the lesions rapidly expand to most or all of the leaves, and can invade the petioles and stems along the leaf margins to form brown streaks. The leaves and stems grow a circle of white mold along the edges of the lesions. When the humidity is high, the leaves also grow white mold. When the weather is dry, the spots are dry and brown, no white mold, and the leaves become brittle and easily cracked. The occurrence of potato wedges caused irregular purple spots, depressions, hardened tissues, and dry rot. The diseased potato was cut from the lesions. A deep layer of potato meat turned into a reddish-brown color under the skin and soft rot in the wet. smell. How to control the hazards of potato early blight and late blight disease Establish a disease-free seeding area, select healthy seed potato to establish a disease-free seed-retention land, use disease-free seed potato as a seed, eliminate the source of disease infestation, and play a significant role in controlling potato late blight . Pull out the central diseased plants, timely control the onset center by spraying pesticides to strengthen disease monitoring during the growing period of the potato. Once the central diseased plant is found, remove it immediately and destroy it deeply. At the same time, spray the pesticide around the central diseased plant and spray it once every 7-10 days. Even spray 3 to 4 times. If the rain is frequent, the interval between sprayings should be appropriately shortened and the spraying should be increased 1 or 2 times. 25% of metalaxyl WP can be used for potato late blight, 58% of metalaxyl manganese zinc 100g, 40% of 200mg aluminum diphosphonate, 80% MnZn dry suspension agent ) One hundred grams of optional spray 50 kg of water spray, spray 7 to 10 days at a time, spray a total of 2 to 3 times. Potato early blight is selected by 1000 times copper sulfate, 800 times by 40% carbendazim, or 600-5800 times by 50% chlorothalonil, or 250-400 times by 25% leaf blight, 7-10 days. , spray 2 or 3 times. In order to avoid the emergence of resistance, it should be used alternately. Continuous spraying of the same agent must not exceed 3 times. In order to slow down the emergence of drug resistance, it should be noted that the rotation of medication.
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