The scientific name Chaetocnema concinna (Marshall) is a Coleoptera, leaf armour. Alias ​​蓼 蓼 蓼 蓼. Distributed in Hubei, Jiangxi, Hunan, Zhejiang, Fujian, Guangdong, Guangxi, Sichuan, Guizhou and Heilongjiang.
Host beets, alfalfa, buckwheat, rhubarb, sorrel.
Characteristics of damage Adult beetles damage the seedlings of the sugar beet, and the epidermis of the damaged leaves is eaten, forming light-colored spots that gradually become holes, causing the whole plant to wither.
Morphological characteristics Adult body length 1.5-2mm, all black, metallic luster. Coleoptera engraved on the longitudinal column, forming a number of longitudinal sulcus, prosthodontic plate near the posterior edge of the two sides each with a sickle-shaped shallow sag, along the trailing edge of a column of rough engraved points, the two tentacles base with a l On the ridges and near both sides of the compound eyes, there were a group of about 5 or 6 small protrusions, and the middle and hind foot articulation ends had a depression with short hairs on them. Eggs pale yellow, oblong, pentagonal and wrinkles in shell masks. The larvae are 2mm long, white, yellow in the head, and the lower abdomen with 2 spines. The dominant species in the northeast sugar beet growing area is Chaetocnema discreta Baly, known as the sugar beet. Adult body length 2-2.4mm, width lmm, body oval, bronze, with luster; tentacles, feet yellow-brown, after the femoral section black and red, with metallic luster, crown arch, compound eye medial deep groove, surface Fine-grained, with a few moments; antennae about body length 1/2, section 2 thick, no shorter than the 3,4 section, and the remaining sections are longer than the 4 sections. The thoracodorsal plate is approximately equal in width to the elytra, and irregular fine spots are arranged on the surface; the small scutellum is small and semi-circular, with no spots. The engraved points on the elytra were thicker than those on the thoracodorsal plate, arranged in longitudinal rows, with fine engraved dots between the lines, ridges rising, and bulging toward the ends and outwards. Egg oval, light yellow, slightly transparent, 0.4-0.5mm long. Larvae body length 4-5mm, slightly cylindrical, tail slightly.蛹 Oval, light yellow-green, about 2-3mm.
Life habits Beet Vaccine 1 year old, with adults in the ditch, field side weeds and other cover overwintering, Hunchun adult first damage Leica weeds, after migration to sugar beet seedlings damage. The number of eggs is a group, and it is produced in the soil at 3.3-6.6cm. After the larvae are hatched, they first move in the soil, injuring the roots of the plants of the family Polygonaceae, pupating in the soil, and eating the sugar beets after the emergence of the fall adults. After the winter gathering. The beet beetle is one year old. It is wintering in the family Aphididae or Polygonidae. In the spring of next year, the temperature rises and the adults begin to move. In the end of April, the overwintering adult begins to infest the plant. After the sugar beet seedlings are unearthed, A large number of adults moved into the field to injure the seedlings and enter the violating period of the sugar beet. In the south, Hunan, Hubei, Jiangxi, Zhejiang, Fujian, Guangdong, Guangxi, and Sichuan took place early. Adults like to lay eggs on Leke and Polygonaceae.
Control methods (1) Before seeding, seed dressing with 2.5% seed weight of phoxim powder has good effect. (2) Sprinkle 2% acaricidal pine powder or 2% batatan powder, 2.5% phoxim powder, and 2-3kg per 677m2 when the adult grows. (3) Beetroot lines should be appropriately increased in seeding volume, and seedlings should be planted late in order to avoid shortage of seedlings and ridges. (4) Beet is sensitive to phoxim, and care should be taken to prevent phytotoxicity during use.
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