Control of weevil in sweet potato
The sweet potato weevil, also known as the sweet potato ant weevil in Guangdong, is one of the main pests of sweet potato. Autumn potato cultivated in dry sloping land occurred more seriously in the middle and later stages, with a general damage rate of 10%, 15%, and serious plots up to 40%, 50%.
Control methods: conditional implementation of flood-drought rotation, such as rice-potato rotation, potato-vegetable rotation, peanut sweet potato rotation, sweet potato corn rotation and so on, in order to eliminate the source of insects in the field. In the middle and later stage of sweet potato growth, it is necessary to cultivate the soil many times to fill the cracks in the border to prevent insects from invading and harming from the cracks. Strengthen water management, keep the border soil moist, and restrain the reproduction of the insect. Remove the damaged potatoes and burn them outside the field.
Poison bait and chemical spray can be used for chemical control. Soak the potato slices in 40% dimethoate EC or 90% crystal trichlorfon 500 times solution for 20 hours, take out and dry, open a small hole in the sweet potato field, put the potato poison bait into the hole, cover the surface with straw, put 50ml 60 small heaps per mu of potato field, and change the poison bait every 5 minutes to trap and kill adults. In the middle and later stage of the growth of autumn potato, spraying the potato field with 1000 times liquid of 90% crystal trichlorfon 800 could inhibit the invasion and damage of the pest.
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Key points of medium-term Management of seed Sweet Potato
Most areas of drought prevention and drainage are hot and rainy, the stems and leaves on the ground of sweet potato grow rapidly, and the nutrients go up but not down. At this time, attention should be paid to drainage, that is, timely removal of stagnant water on the ground after rain to control the vigorous growth of the aboveground. Some droughts need to be watered to prevent drought, so that potato pieces can not be wet.
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Four key points of field management of sweet potato
One is to fertilize and raise seedlings. During ploughing 7-10 days after planting, 20-30 piculs of human and animal manure water to 10-15 kg ammonium bicarbonate or 5 kg urea (preferably with 40% high-efficiency compound fertilizer 7-10 kg) were irrigated to the pond; at the same time, 100-150 kg of plant ash mixed with 25-30 kg calcium superphosphate was applied to the ponds.
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