The pathogens of autumn cabbage virus disease are mainly cucumber mosaic virus, turnip mosaic virus and tobacco mosaic virus, which are transmitted through aphids or direct contact. The seedlings are most susceptible before the 7th leaf stage. The color of the young leaves is lightened and translu ---MORE---
Although global inflationary pressures further increased in the first half of the year, the world economy as a whole continues its recovery trend last year. China's pharmaceutical foreign trade has accelerated its pace of growth, and foreign trade in Chinese herbal medicines and decoct ---MORE---
Garlic is stringy fibrous root; absorbent capacity is weak, bulbs grow and expand in the soil, so garlic should be selected soil loose, well-drained, organic rich land cultivation. Although the adaptability of garlic is relatively large, it is still better to use sandy loam. Due to loose sandy loa ---MORE---
First, the morphological characteristics Two oviposition moths are Lepidoptera. Eggs are head-shaped, with longitudinal ridges, yellow-green in the beginning, yellow soil in the late, and less than 1 mm in diameter. The larvae have a body length of 14-18 mm, yellowish gray or dark brown. The dist ---MORE---
Trouble phenomenon: Centrifuge is one of the most important equipments for hospitals and scientific research institutions. Its quality directly affects the centrifugal quality of the centrifuged material. "When I was repairing a centrifuge with unstable speed, I fo ---MORE---
Samples of chemical fertilizers are heated or burned, and the true and false fertilizers can be further identified from the flame color, melting condition, smoke taste, residue, and the like. Nitrogen fertilizer: Ammonium bicarbonate, decomposes directly, produces a lot of white smoke, has a stro ---MORE---
Domestic and foreign geese are rich in species resources. Different geese species have their own different characteristics and uses. Developing economic hybrids of geese and making full use of heterosis to produce commercial geese is one of the important measures to increase the economic benefits ---MORE---