Weevil in the main sweet potato producing areas in southern China, is an important pest, often cause sweet potato production to reduce by more than 20%, more serious, the reduction in production can exceed 50%, its harm is great, have to attract people's attention, in the main sweet potato production areas of sweet potato weevil outbreak, the safe production of sweet potatoes plays a great restrictive role.
Sweet potato weevil, also known as sweet potato weevil, or sweet potato ant stung, weevil, etc., different regions of the object nose insect name slightly different, in Guangdong Province, most of the regions will be called weevils as sand lice, there are also called sand worms. Due to the serious harm of weevils to sweet potatoes, in the subtropical and tropical sweet potato producing areas, production, most of the sweet potato weevils are divided into destructive pests, weevil species up to thousands of species, weevil larvae mainly harm the underground roots of sweet potatoes, often causing underground stem swelling greatly hindered, sweet potato blocks that are holeed by larvae, the middle is full of pest excrement, excrement is fermented under the action of bacteria, causing the whole piece of sweet potato mold to rot, lose its edible value, become worthless, moldy sweet potatoes are blackened and smelly , people, animals after consumption can cause poisoning.
Control methods of sweet potato weevil:
1, eliminate the source of insects in the field, weevils like to loose and breathable environment, so in the conditional areas can choose, water and drought rotation, planting rice and sweet potato rotation, can significantly improve the effect of defense against weevil hazards. Sweet potatoes are rotated with grass crops, such as corn.
2, organic fertilizer to be fully decomposed, after full decomposition of farm manure, it will reduce the smell of attracting pests, can reduce the source of insects, and after fully decomposed farm manure, will not produce seedlings and other adverse consequences, conditional places, the oil tea seeds under the scraps, as organic fertilizer, applied in the soil, the object of nasal worms have a certain anti-effect.
3, choose excellent varieties, it is best to choose detoxified sweet potato varieties, sweet potato varieties with strong growth potential, the ability to resist diseases and insect pests is also strong, and pay attention to the choice of disease-free potato seedlings when planting.
4, pharmaceutical control, can be used to eliminate pests in the way of irrigation, tobacco leaf leaching liquid irrigation root, there is also a certain control effect, in the sweet potato weevil occurrence of more serious plots, can use 0.3% matrine water agent, or high-efficiency cypermethrin and enemy insect compound preparation, 1 kg per acre of irrigation root. Before planting sweet potato land preparation, 1 kg of octyl thiophos + 1 kg of cypermethrin is used to irrigate the soil to kill pests, and then plough the land. The weevils on the leaves are sprayed with two packs of sharp special suspension agent per barrel and 15 kg of water, which has a good effect on the control of adult insects.
Sexual attractants are used to trap male insects, and traps are used, and the pest core is placed inside to be used during the adult stinging period, and the trapped pests are regularly disposed of.