The scientific name Pegomya cunicularia (Rondani) synonym Pegomya cunicularia (Panzer) is Diptera, Drosophilidae. Alias ​​spinach leaf fly. Located in Liaoning, Inner Mongolia, Xinjiang, Qinghai, Hebei, Shanxi, and Jiangsu. This species is related to the previously described springfly, also known as spinach leaf miner, which is a different species.
Hosts such as sugar beet, spinach and other plants, Solanaceae, Caryophyllaceae.
The larvae damage the larvae and feed on the leaf flesh, forming massive tunnels, retaining insects and destroying chlorophyll and reducing yield.
Morphological characteristics Adult body length 5-6mm, sub-color, light-colored two types. The entire back is grayish-yellow or gray-brown, and some have brown stripes. The head is almost entirely brown, with a black chest. Small scutellum central hairless. Egg length less than 1mm, long oval, white dull, the surface has an irregular hexagonal sculpture. The last instar larvae were dirty yellow, 7.5 mm long, and the front valve had 7 to 11 tillers, mostly 8; the end of the abdomen had 7 fleshy protuberances; the cocoon was 4.5-5 mm long, yellow-brown or dark brown.
Caiquan flies and Xiao Xiaoquan fly are very similar. The difference is as follows: The first flanks of the 5th web of the male flies have only fine hairs on the inner side of the flanks, and no black short hairy tufts on the base. The bases of the Xiaoqin spring flies have extremely short bristle tufts. Slightly different; the lateral branches of the male tail flanks of the male flies are straight, the ends are not hooked, and the branches are very narrow and claw-shaped. Xiao Xiaoquan's former branches are narrow and narrow, with "S"-shaped forward bends, a furrow at the end, and a slightly wider posterior branch with a sharply tapering tip. The former is slightly wider than the previous monocular eye. Xiao Xiaoquan flies are separated by two eyes, and the forehead and front monocular are equal.
Living habits Beijing 3-4 generations, dipping in wintertime in the earth diapause, all generations of some crickets into diapause, resulting in overwintering adults and the first generation of harm, eggs prolific in the back, 4-5 The granules are arranged in a fan shape and the larvae drill into the leaf after hatching, which takes more than 10 hours to complete. The worm is generally reluctant to lay eggs on plants that have already been damaged, and does not like to drill into the leaves of existing tunnels. Because the victim’s host lost water from the victim tunnel, the concentrations of catechol and o-diphenol were increased. Therefore, the worm finds another way to drill into it.
Prevention methods (1) Spring sowing should be applied in the fall of last year to reduce the damage. (2) Topdressing quick-impact fertilizers at the seedling stage, accelerating growth, and shortening victimization time can also reduce damage. (3) It was suggested that when more than 10 eggs were laid on the leaves of the five-leaf stage and the initial larvae were harmed, spray 10% imidacloprid wettable powder 1500 times or 50% fly larvae powder 2000 times, 16% SF-3 1500 times liquid, spray liquid of 60L per 667m2. In addition, 5% fipronil suspension can be used, and 50 to 100 ml per 667m2 can be used for special effects.
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