Pesticide application principles for four diseases in the middle and late stages of peanut:
1. Bacterial wilt is a typical vascular bundle disease, with the heaviest flowering period of peanuts. In the early stage of the disease, the leaves of the main stem usually lose water and wilting. In the morning, the leaves open late and close early in the evening. Subsequently, the disease progressed, and the whole plant leaves withered sharply from top to bottom, and the whole plant died of green and dry. The diseased plant was pulled up, and the tip of the main root became brown and wet. The longitudinal stalk showed that the vascular bundle turned dark brown and streaked. The late part of the diseased plant was wet and rotted, and the white intestine was overflowed.
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 using tea with mash and base fertilizer in the seeding ditch; if necessary, spray the root with a solution of 14% solution of lycopene copper water, 250 ml of each solution, and Spraying a new high-fat film 800 times solution enhances the efficacy.
2. Leaf spot disease is divided into brown spots and dark spots, which are 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 . When adding the right amount of Tianda Silicone, it saves time and effort, and it doesn't need to be re-sprayed when it rains.
3. Stem rot is commonly known as rickets, which is very harmful to peanuts and is a fulminant disease. The pathogen is firstly inoculated with cotyledons, dark brown rot, and then infects the base of the stem or the stem of the underground, producing a yellow-brown water-stained lesion, which turns dark brown, expands into a ring-shaped lesion around the stem, all the petioles collapse, and the whole plant is wilted. When the soil is wet, the surface of the diseased part is black and soft rot, and the small spots on the lesions are in the late stage, which is the conidial stage of the pathogen.
Control method: use resistant varieties. Reasonable rotation is the best, and grass crop rotation is best. Clear the field scum. Avoid cultivating the peanuts when cultivating the grass, and reduce the infection of the bacteria. The field strains were removed in time and taken out of the field for destruction. Timely drainage and flood prevention. Use 50% carbendazim WP 800 times solution, or 70% thiophanate-methyl WP 1000 times solution, or 25% bacteria 100 gram 1500 times solution and add "Tianda 2116" peanut-specific 600 times solution.
4. Rust occurs in leaves, petioles, vines, and stems. At the beginning of the leaf infection, there was a pale yellow lesion on the front or back of the leaf, which was enlarged to a pale red plaque. The rupture of the epidermis revealed a reddish-brown powder, that is, a rust spore heap, and the leaves fell off in severe cases.
Control method: 100 grams of chlorothalonil (60 kg of water) plus 600 times of "Tianda 2116" peanut type, or 1:2:150 times Bordeaux liquid 75 kg plus "Tianda 2116" peanut special type 600 Double or 托布津 2000 times liquid plus "Tianda 2116" peanut-specific type 600 times, spray once every 7 days, even spray 2 to 3 times for prevention.
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