How to control common pests in alfalfa
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Insect pests can cause a great deal of damage to the stems and leaves of alfalfa, affect the amount and quality of grass production, and must be based on the occurrence of pest control as soon as possible in order to minimize the damage caused by pests. The pests that cause harm to alfalfa are mainly locusts, thrips, cockroach-seeded bees, blind cockroaches, chafers, and leafhoppers. The damage symptoms and control measures are introduced separately. The aphids sucked sap with a sucker and accumulated them on the tender stems, leaves and buds of the aphids. After being harmed by the aphids, the axillary leaves curled and the flower buds and flowers yellowed off. In severe cases, the plants died. The aphids that are harmful to ticks mainly include: aphids, bean-free long-tube aphids, tick-fly aphids and the like. The prevention and control of aphids should be carried out as soon as possible. First, cultivated animals can kill a large number of aphids through cultivated land in early spring or irrigation in winter. The use of alfalfa and grass crops or crop rotation, timely removal of weeds in the field and other measures can also effectively reduce the number of aphids. harm. It is best to use biological control in the prevention and control, using natural enemies of aphids to eliminate aphids. When the aphid has a serious harm, chemical control should be used. It should be sprayed with dimethoate or 40% omethoate EC 2000 times. Since dimethoate has a negative effect, it should be used at intervals. Thrips and thrips are the major pests in the production of northern apes. When the thrips are seriously damaged, the yield loss of fresh grass can reach more than 50%. Thrips are sucking mouthparts, which are mainly harmful to the young tissues of the pupa. The epidermis of the new leaves is smashed and the wounds healed after the new leaves are unfolded, resulting in deformed leaves. The humming grass humming horses mainly include: horned tussocks, hummers, hummers, common hummers, and smoke thrips. At present, the control of thrips can only be based on chemical control, such as the use of 1500-3000 times the liquid, pyrethroids such as cypermethrin, or low-toxic organophosphorus pesticides, such as methyl parathion, or carbamate class kill Insecticides, such as carbaryl, are tested and controlled. Spraying should be sprayed on the weeds around the field at the same time. When pests are severe, they should be harvested as soon as possible to reduce losses. The blind fleas are mainly deaf blind lice and grass nymphs. The adult nymphs and nymphs suck sucking stems, leaves, buds and ovary with sucking mouthparts, affecting the yield of fresh grasses and seeds. In general, cutting can reduce the damage by 10% bloom, and can be obtained by diluting 1000-2000 times of liquid, 40% of Dimethoate 4000 times or 50% of Malathion EC 3000 times in larval period. Good control effect. The scarabs of the beetle species include the black cashmere beetle, the brown beetle beetle, and the North China black beetle beetle. Its larvae are called cockroaches and endanger the plant's roots and stems. Adults feed on the stems and leaves of plants. The prevention and treatment of chafers is generally carried out before sowing or at the time of sowing. Before sowing, 22.5 kg/ha of 5% carbaryl powder is ploughed into the soil, and 3% of methyl isothione granules are sprayed with seeds, such as 22.5-30 kg/ha. Received good control effect. The leafhoppers of the leafhoppers on the backs and tender stems of adult plants and nymphs clusters suck their sap, causing the plants to stunt and even die out. In the period of nymphs can be sprayed with 40% dimethoate EC 1000 times, 50% Yeyu San EC or 90% trichlorfon 1000-500 times for control. The noctuid moths that are harmful to moths are mainly Spodoptera exigua and Spodoptera exigua. The hazard period in the north is from June to November, and the most serious ones are from July to October respectively. The moths mainly feed on the leaves of loquat, and the wounds caused by the damage are likely to cause the occurrence of leaf spot, which has a great influence on the yield and quality of loquat. Excluding pests and aphids that are particularly resistant to insecticides such as organophosphorus, carbamate, pyrethroid, or chitin synthesis inhibitors, and control their habits according to the moth, often in the morning and evening. Spray, dosage 33.5-50 ml, diluted 1000-2000 times to use. In short, in the production of alfalfa should be integrated prevention and treatment, combined with the local pest pests in time to prevent the law, select pest-resistant varieties, combined with rational fertilization and other cultivation measures, can reduce the occurrence of pests, effectively improve the yield and quality of alfalfa.