The scientific name Delia platura (Meigen) belongs to the order Diptera, Drosophilidae. Alias ​​grounds. Distributed throughout the country.

Host rapeseeds, vegetables, fruit trees, trees and various crops.

The damage is characterized by the larvae feeding on the germinating seeds or the subterranean tissues of the seedlings, causing rot to die.

Morphological characteristics Adult body length 4-6mm, male slightly smaller. Male body color dark yellow or dark brown, two compound eyes are almost connected, black antennae, three black vertical lines on the back of the chest, the length of the forehead base is less than the length of the back in the back of the shield between the shield, the lower part of the hind foot embryo with 1 Columns are short hairs with densely curved distal ends; 1 with black vertical lines at the center of the abdomen, and 1 black horizontal stripes between the abdominal segments. Female gray to yellow, the distance between the two compound eyes is 1/3 of the width of the head; the forewings are backed by males, the posterior tarsus have no male flies, and there are 1 set of bristles on the outer side of the middle tarsus; the central longitudinal lines of the abdomen are not obvious. . The egg is about 1mm long, long oval, slightly curved, milky white, surface with a pattern. Larvae crickets, body length 7-8mm, milky white and slightly light yellow; tail section with 7 pairs of meat protrusions, 1-2 pairs of high, 5-6 pairs of equal length.蛹 4–5mm long, reddish-brown or tan, elliptic, seven protrusions in the abdomen.

The habits of life are 2-5 years old. The northern part of the country is wintering in the soil. The southern part of the Yangtze River in the winter can be seen in various forms. Seed flies above 25 °C, completed l generation 19 days, spring average temperature 17 °C takes 42 days, autumn average temperature 12-13 °C will take 51.6 days, early spawning 30-40 days in early summer, late autumn 40-60 On days, eggs above 35°C and 70% could not hatch, and larvae and cockroaches died. Therefore, the summer flies were rare. The fly species prefers daytime activities. The larvae mostly move under the surface soil or young stems.

Control methods (1) Apply adequately cooked organic fertilizer to prevent adults from spawning. (2) The adult spawning peaks and mantle hatching peaks are timely controlled. Predicted adult worms usually use the induced adult method. Induction formula: 1 part sugar, 1 part vinegar, 2.5 parts water, add a small amount of phoxim and mix well. The maggot trap uses a large bowl, first puts a small amount of sawdust, then pours the attractant on the lid, opens the lid every day during the adult flight activity, checks the number of trapping and killing, and pays attention to the addition of the trapping agent, when the number of traps increases sharply or the sex ratio is nearer. At 1:1, it is the adult period and should be immediately controlled. (3) In the adult stage, the ground dusting with 5% insecticide fear powder or 21% killing quail-emulsifiable concentrate 2000 times, 2.5% deltamethrin 3000 times, 40% cinamyl chloride high 2000 times Liquid (Beijing Shunyi County Pesticide Factory), 20% locust net emulsion 2000 times liquid, once every 7 days, continuous control 2-3 times. When the local cockroach has entered the seedling root, 50% phoxim EC or 25% ikaka EC 1200 times, and 20% methylisophos- erythritol EC can be used to irrigate the root. (4) Chemical treatment of soil or seed with 50% phoxim EC per 667m2 200 to 250g, add water 10 times, spray on 25-30kg fine soil and mix well into poisonous soil, apply along ridge, then shallowly or with the same The amount of poisonous soil is sprinkled on the seed ditch or the ground, which is then ploughed, mixed with manure, or combined with irrigation. Can also be used 2% methyl isophosphorus powder per 667m2 2-3kg mixed fine soil 25-30kg made of toxic soil or with 3% methyl isofluosa phosphate granules, 5% phoxim granules, 5% sub-agriculture Granules, with 2.5-3kg per 667m2 of treated soil, are able to receive good results, as well as the treatment of golden needles and cockroaches. Pharmaceutical treatment seeds: Currently used for seed dressing agents are mainly 50% phoxim, 20% isoflavos, the amount of which is generally pharmaceutical 1: water 30-40: seed 400-500; also available 25% phoxim Organic phosphorus pesticides such as capsules, or seed dressings with insecticide seed dressings, can also treat underground pests such as golden needles and cockroaches. (5) Poison Valley uses 25% to 50% phoxim capsules 150 to 200g for 667m2 and 5kg or 50% phoxim 50 to 100g for bacon and 3-4kg of bait. Sprinkle in the ditch. Floor pests, gold bugs and other underground pests.

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