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The damage and control of Liriomyza sativae
Liriomyza is a polyphagous pest. Hosts include legumes, cucurbitaceae, Solanaceae, Asteraceae, and Cruciferae, and 13 families and more than 60 species of plants. Liriomyza larvae and adults can damage the leaves, reduce the photosynthetic efficiency and nutrient conduction in the leaves, and adults can sometimes transmit the virus. Its small body and hidden life have caused great difficulties for prevention and control. Hazardous characteristics: The individuals of Liriomyza sativae are very small. The adult body length is 1.0-2.0 mm, with obvious phototaxis, yellowing and greening. The female worm body is slightly larger than the male, and the adult body is dark in color and has a certain ability to fly. The females rely on the ovipositor stab wounds to feed on the sap, and the feeding spots are concentrated on the edges of the leaves. Spawning is mostly on the upper and lower epidermis of the leaves, and the spawning hole is smaller and rounder than the feeding spot. Eggs are difficult to observe with the naked eye. Eggs are translucent, milky white, and turn dark when they are hatched. The larvae feed immediately after hatching, scrape the leaf flesh with mouth trenches, and form a one-way snake-like tunnel on the leaves. The black insects on both sides of the insect path are arranged in a discontinuous line. The larvae can be divided into 3 instars. The mature larvae stop eating, and they bite at the end of the aisle and “Uâ€-shaped openings are drilled to remove them in hidden places. The beak is wintering in the soil.蛹 Oval, shiny, slightly flattened abdomen, dark brown before emergence. Comprehensive control of Liriomyza sativae: The host of Liriomyza sativae mainly concentrates on crops such as celery, cucumber, beans, pepper, tomato, lettuce, oiled wheat and cabbage in the north, and the distribution range has increased year by year. 1. Agricultural control: According to the results of the census, carry out reasonable interplanting between host plants and non-preferred plants; regularly clean the pastures, eliminate weeds, and timely destroy destroyed leaves. 2. Physical control: According to the yellowing potential of the adults of Liriomyza sativae Blanco, the yellow plate method is currently the most simple and effective method of trapping and killing, especially in protected areas. Liriomyza sativae usually has two occurrence periods within one year. From March to May and July to September each year, yellow plates are placed at a distance of 6 meters from the ground at 30 cm and replaced regularly. 3. Chemical control: Currently widely used chemical pesticides include marathon, ciprofloxacin, abamectin, cypermethrin, and insecticides, among which cyromazine and cypermethrin are considered to have better control effects. 4. Biological control: Abamectin agents are widely used in the prevention and treatment in recent years. The efficacy of the drug is still more than 60% after 12 days. It shows good control effect and persistence. Parasitoids are also one of the most important means for the control of Liriomyza in recent years. Author: Tianjin Institute of Horticultural Engineering
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