There are three main types of locusts that damage kenaf and jute: Aphis gossypii G10ver, Lipaphis erysimi pseudobrassicae (Davis), and Myzus persicae (Sulzer). Both belong to the Homoptera, maggots. Distributed throughout the country, kenaf, jute production areas have occurred.
Injury characteristics Three locusts often cluster on the back of young leaves of kenaf or jute, or suck sap on tender stems, causing the leaves to curl and die, the growth of the seedlings stagnating or the whole plant to die.
Morphological characteristics of cotton, rape insects - cotton aphid, peach aphid.
Habits of life The Yangtze River basin Ma district annual cotton aphid 20-30 generations, 35 latitudes. To the north, the wintering of eggs on pepper, hibiscus, twigs of plum trees, and Prunella vulgaris; latitude 25-30. The area is wintered with eggs, oysters or quail. At an average temperature higher than 6°C, hatching is started, and viviparousness occurs at 12°C and 16-22°C. In mid-March, Zhejiang Province hatches, breeds 2-3 generations on the double-leafed hibiscus, purpura, and hibiscus, producing winged crickets. When kenaf and jute are unearthed from late April to early May, they fly to the ramie and cause damage. High summer 4-5 days of breeding a generation, when the temperature is low in spring and autumn, about 20 days and 1 generation. In late autumn, after flying to the overwintering host on the mating, the eggs are produced in the axillary buds. Peach pods and vegetable pods are overwintering in the leaves or weeds of rape, cabbage, and radish, and are damaged when they are unearthed. The number dropped when temperatures were high, and the number of cooler days after the fall increased. Temperature 14-25 °C, relative humidity 50-80% easily occur, continuous rain or heavy rain can reduce the amount of plutonium. Former buckwheat or undistributed Maeda is heavier than rapeseed field, wheat field, and broad bean field. There are seven-star ladybirds and other natural enemies.
Prevention methods (1) Before the winged plover flies, pay attention to reduce the aphids on the overwintering host near Ma Tian, ​​and spray 40% Dimethoate EC 1000 times if necessary. (2) After unearthed, when the leaf rate of the affected seedling reaches l0%, timely spray 2.5% deltamethrin EC 4000 times solution, or 20% quick kill DFE 4,000 times solution, and 50% antimony loose EC 4000 times liquid. (3) Advocate the release of seven-spot ladybugs and other control of aphids, the ratio of scoops to 1:150-200 can be effective.
Pvc Panel For Pigs Separator for a variety of pig cages, made of high quality PVC plastic. PVC material determines it is durable, but also easy to clean and disinfect. PVC Panel For Pigs surface is very smooth, easy to clean, but also to avoid sow pig pig cage injury. PVC Panel For Pigs is hollow inside with ribs, this design helps to reduce the weight of the PVC Panel For Pigs while increasing the strength of the PVC Panel to carry larger weights of livestock. The size of our PVC Panel For Pigs is changeable. If you have special needs and orders are large, we can produce according to your requirements. We will provide you with the highest quality products and the most suitable price.
PVC Panel For Pigs
Pvc Panel For Pigs,Pig Farm Used Pvc Panel,Durable Pvc Panel,High Strength Pvc Panel
HuangHua FengYi Honde Metal Factory , https://www.farrowingcratesfromchina.com