During the late growth stage of peanuts, many farmers relaxed their management and often caused premature aging, but they were mistaken for precociousness. Premature failure leads to insufficient fullness and severely affects yield. The late stage of peanut growth is still an important period of management, try to maintain the green function of the leaves, so that the normal yellowing of peanut leaves, to ensure normal kernel grouting, in order to increase production and increase quality.
First, rust rust disease mainly damages the leaves. In the early stages of infection, the tip of the blade appears yellowish lesions on the front or back of the blade, and later expands to pale red, and the lower leaves begin to develop and gradually expand. The diseased plants are shorter and form the center of onset, with early deciduous dead. The fruit handles are easily broken and desolate at the time of harvest. When the diseased strain rate in the field reaches 10%-20%, 75% dichlorline wettable powder 600 times, or 75% chlorothalonil wettable powder 500-600 times, or 15% triadimenol can be used. Wet powder 1000 times, or 1:2:200 Bordeaux spray control, spray 0.2% spreader, such as detergent, there are synergies, spray about 10 days 1 time, even spray 3 - 4 times.
II. Anti-yellowing disease The symptoms of the disease are chlorotic in the upper leaves, while the old leaves and veins in the lower part remain green. In severe cases, the leaf veins become green and yellow, and all the new leaves in the upper part turn white, causing brown spot necrosis, desiccation and shedding. The main reason is iron deficiency. For prevention and treatment, 1% ferrous sulfate aqueous solution and humic acid foliar fertilizer can be sprayed on the leaves, and control can be made once every 5-7 days. According to the occurrence, it can prevent 2-4 times.
Third, the incidence of adult stem rot disease prevention in the first place near the ground at the base of the first pair of branches, the beginning of a yellow-brown water-like lesions, then turned into a dark brown, surrounded by expanding the surrounding stem base, causing dark brown rot, The aerial parts shrink and die, and the diseased part of the disease has dense black granules (conidial organs). The diseased fruit rots, or the seed kernels are not full, and the seriously ill plants can die. In the early stage of disease, 50% carbendazim WP, 65% zein WP, 500-600 times solution, or 70% thiophanate-methyl WP 800 times solution can be used for spraying. Times, spray 2-3 times. The above agents can also be used to treat peanut leaf spot disease.
4. Infestation of peanut roots, pods, and stalk bases of the control of white peony disease showed brownish soft rots at the beginning, white pods of mycelium at the roots of the shoots, rapeseed sclerotia, yellowing of stems and leaves, and gradual death. , Peanut pods rot. 50% carbendazim wettable powder 1000 times solution, 28% carbendazim jinggangmycin suspension 1000-1500 times solution, or 20% wilting spirit EC 1500-2000 times solution can be used for prevention and control. - 15 days of irrigation, alternating shower 2-3 times, pay attention to spraying evenly.
V. Pest Control This stage is mainly for leaf-feeding pests such as cotton bollworm, cabbage caterpillar, Spodoptera litura, and red spider, etc. It can be controlled by contact-killing or gastric-toxic pesticides.
Sixth, foliar spray fertilizer peanut root growth later in the growth period, the ability to absorb nutrients and water is reduced. Therefore, timely foliar fertilizer application. Can be sprayed with 1% urea water or 0.3% potassium dihydrogen phosphate solution, or humic acid foliar fertilizer, can extend the functional period of leaves to prevent premature aging.
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