Scientific name Chromatomyia horticola (Goureau) Diptera, Liriomyza. The synonym Phytomyza atricornis Meigen, P. nigricornis horticola (Gourean) Alias ​​pea pods. Distributed throughout the country.
Host peas, beans, cowpeas, cabbage, cauliflower, cabbage, rape, radish, lettuce, tomatoes, eggplant, garlic, potatoes and so on.
The damage characteristics of the larvae are caused by the latent leaves of the larvae. The leaves of the larvae leave the upper and lower epidermis, forming a meandering tunnel and affecting the growth of the vegetables. After the peas suffer damage, it affects the fullness of the beans and the seed quality and yield.
Morphological characteristics Adult body length of about 2mm, head yellow, compound eye red-brown. The chest, abdomen, and feet are dark gray, but the mid-thoracic plate, the fin base, the ends of the leg joints, and the posterior edge of the abdominal joints are yellow. The wings are transparent but they have iridescent reflections. The egg is about 0.3mm long, long oval, milky white. The mature larvae have a body length of about 3 mm, and the surface is smooth and transparent. The front valve is forked and protrudes forward. The rear valve is on the back of the abdomen and is a pair of obvious small protrusions with brown ends. It is 2-2.6mm long, oblong, yellow-brown to dark brown.
Living habits occur throughout the country. Occurring in the North China region for 4-5 generations, wintering occurs within the victim's leaves. In late spring and mid-April, the first adult larvae attacked the young seedlings, kept cruciferous vegetables, rapeseeds and peas. From May to June, the damage was the heaviest; in the summer, when the temperature was high, it was rarely seen. In the fall, there were Activities, but not much. Adults are active during the day, sucking nectar and copulating. Spawning more choice young green leaves, produced in the leaves of the edge of the leaves, especially near the tip of the leaf for more, eggs scattered, each one, each female can produce 50 to 100 tablets. When the larvae hatch, they eat the leaf and the tunnel widens as the worm ages. The larvae are old and mature at the third instar, that is, at the end of the tunnel. The developmental duration of each insect: 13-15 °C, egg period 3.9 days, larval period 11 days, flood season 15 days, a total of about 30 days; 23-28 °C, each insect stage were 2. 5, 5.2, 6.8 days, about 14 days, adult life is generally 7-20 days, when the temperature is high 4-10 days.
Prevention and control methods (1) Weeds should be removed promptly after harvest, and weeds should be removed to remove the weeds at the edge of the road and the roadside. (2) Chemical control. When the disease was first seen, it was a large active period of the adult (mid-late and late May). The larvae were in the early stage, and most of the larvae had not yet drilled tunnels. The commonly used agents are: 50% malathion EC 1000-2000 times, 20% fenvalerate EC or 2.5% deltamethrin EC or 20% fenpropathrin EC 6,000-7000, or 40 % Aqueous phosphothiolate EC 1000 times, sprayed every 7-10 days, continuous control 2-3 times, in addition to pea fields, weeds on the ground, roadside, etc. are also the gathering place for adults, should be carried out Prevention. It would be better for farmers to achieve unified control. (3) In areas where the control efficacy of the above-mentioned agents is not satisfactory, insecticides for controlling L. sativae can be used. See Liriomyza sativae control law for details.
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