Colasposoma dauricum Mannerheim Coleoptera, Schott. Alias ​​sweet potato flower insects. There are two subspecies in China: C. Dauricum var. Dauricum Mannerheim said that sweet potato leaf nails are designated subspecies. Distribution from the north of Heilongjiang, Inner Mongolia, Xinjiang, south to Guangdong, Hainan, but mostly north of the Yangtze River. C. Dauricum var. Auripenne (Motschul-sky) said that the sweet potato leaf A splendid subspecies, also known as sweet potato golden flower insects. The southerly distribution is common in the south of the Yangtze River.
Host sweet potatoes, leeks, cotton, small flowers and other flowers.
Injurious characteristics Adults damage the young leaves and tender stems of sweet potato and leeks, causing the top of the seedlings to be broken and the seedlings to die. The larvae damage the potato blocks in the soil and eat the potatoes to form a curved wound, which affects their growth and development.
Morphological characteristics Adult body length 5-6mm, width 3-4mm, short body wide, body color changes, with bronze, blue, green, blue-violet, blue-black, copper and other colors. Different regions have different colors, and the same area also has different colors. Shoulder swollen with 1 flash blue triangle spot. The base of the tentacles is 6 blue or yellow-brown, 5 ends are black, and the head has rough points and engraved with wrinkles. The upper lip is black to dark red; the pronotum is 2 times as long as the long one. The corners are sharp, the sides are rounded, the panel is uplifted, and densely covered with rough carvings; the small scutellum is nearly square, the elytra is protuberant, the shoulders are tall, bright, and the shading on the wing surface is chaotic. The sweet potato leaf sheath spleen subspecies shoulder flashes with a blue and shiny triangular spot behind it, which is an important indicator of the difference between the designated subspecies. Eggs are oval in shape and have a length of about 1 mm. They are pale yellow at the time of first birth and yellowish green at the end. The larvae are yellowish-white, 9-10mm in length, light yellow-brown in the head, cylindrical in shape and short in size, and some are covered with fine hair. Bare beak 5-7mm long, white when the first time, after the yellow-white, short oval.
Living habits Jiangxi, Fujian, Zhejiang, Sichuan, 1st generation, with larvae in the ground 15-25cm at winter, Sichuan, Fujian and some overwintering in sweet potatoes, Zhejiang still see the year of adult feathers in the cracks and litter in the winter. Zhejiang larvae began to lick in late May of the following year, and entered the peak period in mid-June. In late June, adults became prolific and suffered numerous damages. During the middle and early July, the ovipositor lays eggs. After the emergence of the adult, it lives in the earth room for a few days and then becomes unearthed. It is most often unearthed 2–3 days after the rain, and the most intense at 10 and 16–18 hours. It is buried in the soil at noon. Sew or under the leaves. Each female laid an average of 118 eggs, an excess of 600. Adult flying insects have poor fecundity and strong hunger resistance. Adults live for 34 days, 53.5 days for males, 10 days for early spawning, 21 days for spawning and 9 days for eggs. After hatching, the newly hatched larvae infiltrated into the soil and grazing on the epidermis. The relative humidity was lower than 50%. The larvae stopped moving. The soil temperature was lower than 20°C. The larvae drilled into the deep caverns of the soil for winter, and the larva period was about 1 month. The flood season is about 15 days.
Control methods (1) Shake and kill adults. By using this insect dead-flying technique, when the inhabiting activities on the leaves are not significant in the morning and evening, they are collectively extinguished in a plastic bag that has fallen. (2) Before the sweet potato is planted, use 50% of the killing pine oil to dilute the seedlings and dry them, and then plant them to prevent seedling damage. (3) If necessary, spray 50% phoxim EC 1500 times or 30% cyanomethrin 3000 times, 5% Cypermethrin 2000 times, 20% 1500 times, 0.6% Sophora nigra 1000 times. The drug was stopped 5 days before harvest.
Large Starch Separator Mahcine
Large Starch Separator Machine,Separator For Corn Starch,Edible Starch Separator Machine,Cassava Starch Processing
Shuangfeng County Dingyuan Machinery Manufacturing Co. Ltd.. , https://www.separators.pl