Two-leafhopper
The scientific name is Tetranychus urticae Koch, Tetranychidae. Alias ​​cotton red spider, common leafhopper. Distributed throughout the country.
Host corn, sorghum, apple, pear, peach, apricot, plum, cherry, grape, cotton, bean and other plants.
Damage characteristics with cinnabar. In recent years, the worm has damaged corn in Ningxia and has become a major pest in corn production. The morphological characteristics of the body become more and more body color dark green, brown green, dark brown, orange red and other colors, usually with red or rust red. Each side of the back of the body has a dark red long spot, and sometimes the middle spot color is divided into two blocks. There are 26 bristles on the back of the body, arranged in 6 rows. 4 pairs. Females are 0.42-0.59 mm long, oval, mostly dark red, yellow-brown; overwinter orange, more summer-type hypertrophy. The male body is 0.26mm long, nearly ovoid, with a rounded front end, a sharper abdomen and mostly bright red. Oval, 0.13mm long, smooth, colorless, transparent, orange-gray, will appear red eyes when hatching. The young hatchlings were nearly round when hatched, and their body length was 0.15 mm. They were colorless and transparent, darkened green after feeding, and their eyes were red. There were 3 pairs of feet. If the pre-cockroach body is 0.21mm long, nearly ovoid, 4 pairs of feet, the color becomes darker, and the body's back appears dark spots. The late Ruoqiang was 0.36mm long and brownish in color, similar to the adult. Male nymphs are male adults after desquamation.
Living habits are more than 20 generations old in the South and 12-15 in the North. In the north, adult females lurk in the rhizosphere of perennial soil such as earth seams, litters, or weeds, Prunella vulgaris and other perennial root weeds. When the average temperature in February reached 5-6°C, the overwintering females began to move and began to spawn at the average temperature of 6-7°C in March. The egg period is more than 10 days. It takes 20-30 days for adults to lay eggs until the first generation larvae hatch. Future generations overlap. As the temperature rises, the breeding speeds up. At 23°C, one generation of 13 days is completed; 26°C is 8-9 days; 30°C is more than 6-7 days. Overwintering females are mostly concentrated in the early spring host (mainly perennial weeds) for breeding damage, and will be transferred to damage after emergence. In mid-June, a mid-July period is due to damage. Entering the rainy season, the density of worm populations has rapidly declined, and the damage has basically ended. If the drought is still late, it can be harmed again. By September, the temperature has dropped and gradually transferred to the weeds. In October, they have gradually passed winter. Genital reproduction occurs, and eggs can be laid without crossing the tail. Male eggs hatch from unfertilized eggs. Each female can produce 50 to 110 eggs. Happily clustering leaves near the back of the main vein and spoiling and netting under the net is harmed, and when the large amount occurs or the food is insufficient, there are often more than a thousand clustered leaves forming a mass. There are spinning drooping habits spread by the spread of wind power. High temperature and low humidity are suitable for occurrence.
For control methods, see cinnabarin.
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