Medicinal Plant Pests Onions
The scientific name Thrips alliorum (Priesner) is a member of the order Thysanoptera, Thripidae. Synonyms Taeniothrips alliorum Pries-ner Alias ​​green onions Hummer, Leek Hummer, onion with Hummer. Distributed in the Northeast, Beijing, Hebei, Zhejiang, Jiangsu, Guizhou, Guangdong, Guangxi, Hainan, Taiwan, Shaanxi, Ningxia, Xinjiang, Inner Mongolia and other provinces.
Host green onions, onions, leeks, garlic and so on.
The characteristics of the insects and nymphs damage the host's heart leaves, buds and young leaves, the whole growth period of the onion has its various insect parasites activity, feeding, causing onion damage after the formation of contiguous leaves on the surface The silvery white bar, severely distorted yellow leaves and withered leaves, looks at far from the “dry elephants†of onion fields, seriously affecting the quality and yield of spring onions. Welsh onion has the habit of eating raw food in the north. The damage is severe and the leaves are full of marks. They can no longer eat raw food. According to investigations, the damage rates in Inner Mongolia, Ningxia, Gansu, Shandong, Hebei, Shanxi, Shaanxi, Liaoning, Jilin, Xinjiang, Henan, Anhui, Jiangsu, Shanghai, Zhejiang, Jiangxi, and Guangdong are all 80-100%. When garlic and onions are damaged by thrips, the bulbs become smaller and even rot. Onion thrips are often mixed with haze thrips, flower thrips, and rice tube thrips, etc., and they should be emphasized in production.
Morphological characteristics Female adult body length 1.5mm, dark brown, tentacles Section 3 dark yellow, yellowish fore wing, abdomen 2 ~ 8 front edge line dark brown. The head is slightly longer than the front of the chest, and the eye between the monoculars is longer than the rest of the head and is located on the outer edge of the triangle. After compound eyes, the skeletons were arranged in a row. Antennae 8 knots, the fork-like sensory cones on the 3rd and 4th sections reach the base of the anterior segment. The prosthodontic plate has a pair of long ridges in the posterior horn, the medial malleolus are longer than the lateral malleolus, and the posterior margin has 3 pairs of iliac crests. The median iliac crest is longer than the remaining 2 pairs of iliac crests; the mid-thoracic back plate is full of horizontal lines. There were 49 forebrain anterior ridges, discontinuous epiphyseal veins, 7 basal ridges, 3 iliac crests, and 12 to 14 venation ridges. On the 5th to the 8th abdomen of the abdomen, the cuspidate combs on both sides of the back plate are blurred, the back edge of the 8th back plate is degraded, the 3-7 posterior side sheet usually has 3 accessory iliac crests, and the 3-7 diaphyseal plates each have 9-14 appendages. Male short-winged, 3-7 webs have transverse glands.
Life habits Inner Mongolia, Shanxi, Ningxia, Shaanxi, Shandong, Hebei, Henan, Liaoning, Jilin, and other provinces have 7 to 10 generations, and from late June to late July, they have entered a period of high damage. Guangdong, Guangxi, Fujian, Jiangxi, Zhejiang, Sichuan and other provinces are 10 to 12 generations old, and from late May to mid-June, they have entered a period of severe damage, and the rate of damage is 80 to 100%. Adults do more damage in the back of the leaves during the daytime. In the middle of June, the number of leeks on the leeks was the highest, which was a serious period of damage. The amount of worms was ranked in late June. After July, it entered the hot season, and the number dropped sharply.
Control methods (1) Remove the dead leaves from the field and reduce the overwintering base number. (2) Chemical control is the key to controlling onion thrips. After identifying the major species of thrips that are responsible for the damage of onions in the local area, they are responsible for the timely spraying of 10% imidacloprid wettable powder 2500 times or 10% of the 2000 times diluted milk solution, 40% green vegetable treasure cream 1500 at the time of their nymph damage. Times of liquid, 48% chlorpyrifos EC 1300 times, 1.8% edford (Abadin) EC 3000 times, 17.5 MP WP 2000 times, 40% Qixing IP 600~800 times Liquid, 25% Ekass EC 1500 times, 50% phoxim 1500 times. Prevention 2 to 3 times.
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