Scientific name Liriomyza huidobrenisis (Blanchard) Diptera, Liriomycidae. Alias ​​Liriomyza. Distributed in the New North District, temperate regions of the Northern Hemisphere. In recent years it has spread to Europe and Asia. In 1994, with the introduction of flowers, the insects entered Kunming, Yunnan and spread from flower nurseries to farmland. Now Yunnan, Guizhou, Sichuan, Qinghai, Shandong, Hebei, Beijing and other provinces and cities have reported damage to broad beans, peas, wheat, barley, celery, tobacco, flowers, etc. It is a dangerous quarantine target. There are 19 families and 84 species of plants such as broad beans, potatoes, wheat, barley, peas, rape, celery, spinach, lettuce, cucumbers, chrysanthemums, cockscombs, carnations and other flowers and medicinal plants, and tobacco. Characteristics of the culprit The adult eggs are produced in the leaves by an ovipositor. The hatched larvae eat leaf mesophyll between the upper and lower epidermis of the leaves. They eat ribs and veins, and the leaves become transparent plaques, causing the seedlings to die and become destructive. Big. The larvae usually form a subterranean passage along the veins, and the larvae also feed on the sponge tissue beneath the leaves. The leaflets are often incomplete when viewed from the leaf surface, unlike the Liriomyza sativae. Morphological characteristics are found in Liriomyza sativae. The adult wing length of Liriomyza huidobrensis is 1.7-2.25mm. The middle chamber is larger, and the length of M3+4 ends is 2-2.5 times longer than the secondary end. The amount is prominent in the eye, orange, yellow, slightly dark on the upper eyelid, inside and outside the top of the dark corner of the Health Department, the upper eyelid 2 pairs, the lower jaw 2 pairs, the cheek length is 1/3 of the eye height, the midbrain back black slightly bright. The posterior horn with yellow spots, the back of the medial nevus 2 10 l, scattered in the middle of the irregular 4 lines, the middle side of the film below 1/2 - 3/4 or even most of the black, only the upper yellow. The foot base is yellow with black lines. The leg section is basically yellow but with black stripes until it is nearly full black. The knots and knots are dark brown and black. After the larva body is white, the valve protrudes with 6-9 air hole openings. Male external genitalia: The end-yang body and the ossification strong front body of the middle body are connected by a membrane, showing a gap, and the middle and posterior segments are almost transparent. The pump is dark brown with short shank, small blades, and back teeth with 1 tooth. At the early stage of the beak, it is yellow and gradually darkens until it is dark brown. It is darker and has a larger body than Liriomyza sativae. Rear valve protrusions are similar to larvae. Habits This worm was ominous in Yunnan. According to foreign reports, the optimum temperature of this insect is 22°C. There are two peaks in the Yuzhong area of ​​Yunnan during the whole year, that is, from March to April and October to November. During this period, the temperature is 11-16°C, and the maximum is 20°C, which is conducive to the occurrence of this worm. When the temperature rises above 30°C in May, the density of insect population decreases, and the amount of insects during the rainy season from June to August is also low. From December to January, the average monthly temperature is 7.5-8°C, and the minimum temperature is 1.4-2. At 6°C, the worm can also be harmed by activities. The mean annual temperature of Yuanmou in the Yuanmou area is 27.8°C. From November to mid-March of the following year, the average temperature is 17.6-21.8°C. The highest temperature is lower than 30°C, and the temperature rises to the middle and late March. Above 35°C, the amount of insects rapidly decreased. After entering the hot summer and rainy seasons in April, there were few insects in the field until the temperature dropped in September, and the insects gradually recovered. In addition, it is related to the condition of cultivated crops During the mature period of broad bean in central Yunnan, adults migrated to crops like potatoes and potatoes. Liriomyza huidobrensis began to occur in mid-March in Beijing. Before mid-June, the number was small. After that, the population of larvae rose gradually. The highest larvae amount was reached on July 1-7, with 244.5 heads per card, and then decreased. From July 28 to September 15 to November 10, the number of insect populations was not high. The worm mainly occurs in mid-June and late-July. Occupying 60% to 90% of the total amount of the fly is the dominant species in the field. The worm is currently only found in a few areas, but the more dangerous leafminer should attract sufficient attention. Natural enemies are Diglyphus isaea (Walker), Pediobius mit-sukurii (Ashmead), Opius sp. Wait. Control methods (1) Strict quarantine to prevent the spread of this insect to other provinces and cities. (2) Control the source of insects. (3) For other methods, see Liriomyza sativae.