The mantle is a larva of the flower fly, and there are common species of fly, onion fly, radish fly, and small radish fly in China. It is the main underground pest of Liliaceae and Cruciferous vegetables. The prevention and control is not timely, resulting in huge losses in production. The mantle is listed as one of the underground pests of vegetables. Let’s take a look at the latest control methods of the mantle.
First, the hazard characteristics
The mantle is mainly caused by the larvae gathering in the bulbs and soft stems of the lower part of the onion, garlic, and leek. The newly hatched larvae first damage the upper part of the leaf sheath base or the bulb, and the spring and autumn seasons mainly damage the underground young stems, causing the underground stems to rot. So that the upper leaves are yellow and die. In summer, the larvae sneak into the bulbs, and the heavy bulbs rot, and the whole leeks die.
Second, the morphological characteristics
1. Adults resemble house flies, males are slightly thinner, with a body length of about 7 mm, wingspan of 14 mm, dark brown body, female body thick, all yellow-brown, no streaks on the chest and abdomen, dark yellow wings, at rest The two wings are placed on the back of the abdomen. The distance between the two eyes of the female fly is large, the distance between the two eyes of the male is small, and the two eyes are almost in contact.
2. The egg is about 1.3 mm long and has a long oval shape and a milky white color.
3. The larva is milky white. The head end is thin and the tail end is thick. 4, 蛹 long about 7 mm, oval, reddish brown or yellowish brown, 6 pairs of protrusions can be seen at the end.
Third, the latest prevention methods
1. Soil treatment: Before sowing or planting crops such as green onions and garlic, use 2% imidacloprid granules 1--2/kg to carry out soil treatment. It can be applied by means of spraying and stripping, which can effectively prevent the damage of mantle. Valid for up to 80-90 days.
2. In the initial stage of the mantle, 5% fluoropyridinium emulsifiable concentrate 200-300 ml/mu can be used, and 30 kg of fine sand soil can be evenly mixed. The ridge vegetable ridge is evenly spread on the soil surface, then watered along the ridge and water is poured. The medicinal agent was infiltrated into the bulb of the leek, and the virulence of chlorfluazuron to the 4th instar larvae was 3.6 times that of phoxim and 1.7 times that of the 2nd instar larvae. It can produce continuous control effect on the mantle, inhibiting both contemporary and second-generation larvae, prolonging the developmental duration of alfalfa, reducing the rate of pupation, emergence rate and egg production rate. Valid for more than 100 days.
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