Peanut leaf spot and potassium deficiency are spots on the leaves of peanuts. Some farmers are apt to be confused, so we must pay attention to the prevention and treatment.
Peanut leaf spot is a general term for leaf spot diseases such as black spot, brown spot, and net blotch. The disease mainly damages the leaves and can also harm the petioles, fruit needles and stems. Peanut defoliation often causes peanut defoliation and severely affects photosynthesis. In particular, the occurrence of lesions on stems and fruit needles will affect the transport of moisture and nutrients to the fruit pods, making the kernels not full, and breaking the fruit shank when harvested. If the preserved fruits are left in the soil, the output will generally be reduced by 10%-20%, and the severe cases will be over 40%. In the early stage of disease, when the diseased leaf rate reaches 10% to 15%, the pesticide application can be started. It can be controlled by difenoconazole + dsoxazine 2000 times solution or 80% mancozebite 400 times solution, every 7- Spray 10 times in 10 days, even spray 2-3 times, 60 kg per liquid per acre.
In the early stage of peanut deficiency, the old leaves begin to appear yellow spots or brown round spots at the edge of the leaflets. As the degree of potassium deficiency worsens, most of the leaves appear chlorosis in the middle, the leaves grow unevenly, often appear curled or rippled, and only the midribs remain green. There are also brown necrotic leaf blights along the leaf margins. The lack of potassium in late peanuts will lead to premature aging, fruit stems appear dry and fruit drop. In the middle and late stages of peanut growth, 40-80 grams of phosphorus-potassium power or 30 grams of potassium phosphate monobasic acid + 5 ml of love is used per acre to spray a bucket of water, spraying once every 7-10 days, and even spraying. 2-3 times, 60 kg per liquid per acre.
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