Sweet potato moth, also known as sweet potato leaf curler, is a pest that uses the larva to spin the leaf and feed on the leaf in the leaf to harm the sweet potato, amaranth and other convolvulaceae. In recent years, there has been a trend of increasing harm. According to the survey, in the sweet potato, the average leaf damage rate is 60%-70%, and the serious land mass is over 90%, which causes losses to the production of sweet potato. After the leek is damaged, its leaves and young shoots are eaten, not only It affects the growth of amaranth, and seriously affects its quality, reducing the value of food and the value of goods, so it is necessary to timely control pesticides .
I. Occurrence and Hazard Characteristics Sweet potato moths occur in 3-4 generations in my first year, overlapping generations. The insects overwinter in the field with residual plants and fallen leaves, and the wintering crickets begin to emerge in early June. In the second half of June, the larvae are damaged in the field. After mid-August, the density of insects in the field increases, and the damage is aggravated. After October. Old mature larvae phlegm and winter. Adults of sweet potato moths have strong phototaxis and active action. They lurk in the hidden places in the field during the day. They are mating and spawning at night. The eggs are usually scattered between the veins on the back of the leaves. A few eggs are produced on the sprouts and tender stems. The larvae are divided into 4 years old, and the 1st instar larvae only eat the mesophyll on the leaf surface, and do not roll the leaves, but the silk is falling; the 2nd instar larvae begin to spun for a small part of the leaf, and the leaf flesh is eaten in the leaf Sweet potato and leeks; after 3 years of age, the larvae's food intake is greatly increased, the degree of leaf rolling is also increased, and there is a habit of metastasis, and a larvae can damage 10 leaves from small to large. In addition to the main damage to the leaves, the larvae also feed on the tender stems and young shoots. The leaves of the victim are eaten, leaving only the white cortex, which looks like a film. When it happens seriously. Most of the leaves of the leaves are eaten, showing a "burning" phenomenon, affecting the normal growth of sweet potatoes and leeks. According to the China Pesticide Network , the quality of the leek after the victim has deteriorated, and the value of food and the value of the commodity have decreased. The damage of sweet potato plants in the early growth stage will affect the supply of nutrients and delay the growth of sweet potato. During the period from September to October, the sweet potato roots will expand. At this time, the density of insects in the field will increase, a large number of leaves will be damaged, photosynthesis will be reduced, and the expansion of potato chips will be hindered. The loss of production can reach more than 10%.
Second, the prevention and control measures According to the occurrence rules and hazard characteristics of sweet potato moth, it can be controlled from the aspects of agricultural control and chemical control. The main control should be based on agricultural control, supplemented by chemical control.
(1) Agricultural control 1. After the autumn, it is necessary to clean the garden in time, treat the fallen leaves, remove weeds, eliminate wintering, and reduce the insect source in the field. 2. When the first larvae of the larvae are damaged, they should kill the larvae in the new leaf or remove the new leaf.
(2) The prevention and treatment of chemical control drugs should be mastered in the early stage of larval application. The spraying time should be 4-5 pm, and the control effect is better. The preferred agent is sprayed with 48% insecticide lassin emulsifiable concentrate 1000-1500 times, and the control effect can reach more than 90%. In addition, sweet potato field can be selected with 50% methamidophos emulsion 1000-1500 times liquid, 40% monocrotophos 1500-2000 times liquid and 40% omethoate emulsifiable oil 1000-1500 times liquid spray control; % of the chlorpyrifos suspension agent 1500--2000 times liquid, BT emulsion (10 billion cubits / m1) 400-600 times liquid, 40% elegan emulsifiable oil 1000--1500 times liquid spray control, the effect is good. It is especially emphasized that when applying 48% lesbian emulsifiable concentrate and 40% dimethoate emulsifiable concentrate on leeks, it should be harvested after 7 days of application.
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