Grape-related information: now spray wheat with benzene Huanglong and methamidophos pesticide together ... how to take an examination of landscape assistant engineers? In which department can I take the landscape qualification examination? What kind of agriculture is suitable for Liaoning to develop? Detection method of pesticide residues in gastric juice from organophosphorus pesticide poisoning: The mechanism tree of organophosphorus pesticide poisoning in buffalo horn can obtain high yield by pruning in winter. Pruning vines in winter can make the branches in the crown reasonable, prevent the fruiting parts from moving out, and lay the foundation for stable and high yield of grapes. Pruning in winter is usually carried out from the end of June 165438+ 10 to the end of June of the following year, and premature pruning will affect the nutrient accumulation of trees. Pruning can't be put off until spring.