Peanuts grow to the middle and late stages. The most common diseases are bacterial wilt, leaf spot and embroidered diseases. After the onset of disease, the yield can be reduced by 20% to 30%.
1. The bacterial wilt is the heaviest in the flowering period of peanuts. First, browning and soft rot from the roots, and then spread to the whole plant, the leaves withered light, but still remain blue-green. The skin of the white bacteria can be seen to ooze out from the hand. Control method: use rotation; increase application of organic fertilizer and phosphorus, potassium fertilizer; use anti-螨80 varieties. It can prevent the occurrence of this disease by applying tea with mash and base fertilizer to the planting ditch.
2, leaf spot disease is divided into brown spots and dark spots, caused by fungi. Brown spot disease has oval yellow-brown lesions before flowering, and there are obvious yellowish halos on the edge of diseased leaves; black spot disease occurs later, and there are small black spots arranged on the back of the lesions. Plant death. Control method: spray 1 to 2:200 times of Bordeaux mixture (formed by copper sulfate, lime, water) 60-70 kg spray, or 200 times colloidal sulfur spray once every 7 days, even spray 2 to 3 times .
3. Embroidery occurs in the leaves, petioles, vine stems and fruit stalks. The back of the diseased leaf has a protruding point of yellow needle size, which is like a rust powder when rubbed by hand, that is, a rust spore heap, and the leaves fall off in severe cases. Control: 100 grams of chlorothalonil (60 kg of water), or 75 kg of Bordeaux mixture 1:2:150 times, or 2000 times of thiophanate 2000 times, sprayed once every 7 days, even 2 to 3 times Prevention and treatment.
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