Qingdao, Shandong Province Wang Guangdong (135****4186) May 25 Q: The local potato's lower leaves are yellow and spread quickly. What causes the late blight drug?
Wang Guozhong, winner of the 2013 Plant Protection Product Promotion Award, answered that after inquiring about the disease situation, there are several possibilities. To formulate a prevention and control plan, further analysis and judgment should be made in light of the situation on the ground. First, the cause of the disease must be determined. Then symptomatic treatment.
Diseases, when the potato infected with verticillium wilt, early blight, late blight, mosaic virus disease will appear yellow leaves symptoms, the disease symptoms are as follows, please readers compare.
Potato Verticillium wilt is a serious soil-borne and species-borne disease. After infection, the vascular bundles in the roots and stems of the diseased plants are destroyed, and the leaves become yellow and turn brown gradually. Light-onset plants grow slowly and the lower leaves become brown. Withered, showing symptoms of Verticillium wilt, severe wilting of the entire plant withered, and the vascular bundle became dark brown when cut open.
Late blight is a common disease of potato. Leaf disease mostly starts from the middle and lower leaves. It begins with water-stained brown spots on the tip of the leaves. A pale yellow chlorotic edge forms around the leaf lesions. The spots appear black on the stem or petioles. Or brown, if it is judged as late blight, it can be treated with fluopoxam or procyanidin.
Early blight occurred first on the lower older leaves of the plant. Brownish black water-soaked spots appeared on the leaves at the beginning of the disease. Leaf tissue around the lesions and lesions blew green, with the appearance of new spots and old spots. The expansion of the entire leaf chlorosis, then necrosis and dehydration. Early blight usually occurs when tubers begin to expand, and chlorothalonil, mancozeb, and captan are sprayed for control before onset.
In the aspect of fertilizer deficiency, when the potato is lacking in nitrogen, potassium, sulfur and magnesium, it will appear yellow in the middle and lower leaves. If the elements are not replenished in time, they will develop upwards and the whole plant will show obvious symptoms of deficiency.
In the absence of potassium, leaf tip and leaf margin became necrotic, became yellow-brown, and gradually expanded to the whole leaf. The old leaf was bronze and dry off. The nitrogen deficiency was characterized by uniform light green leaves, and the upper leaf roll was cup-shaped in severe cases. The sulfur-deficient plants are yellowing, grow slowly, and brown patches appear on the leaves. The leaves of the old magnesium deficiency fade from the tips of the leaves, leaves, and veins to the center, and the lower leaves become brittle, thicken, and lose their green leaves. Brown and bad color, shedding, if it is determined to be element-deficient, can be sprayed or drip-irrigated with Sukurmi potassium, phosphorus-potassium motive power, benefit nutrition solution, etc. Sulphur dry suspension agent can be sprayed on severe sulfur-deficient blocks.
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