Spring is the initial stage of all kinds of pests and weeds in the orchard. In this period, the base number of the pests is small and it is easy to control. Doing a good job in the prevention and control of all kinds of diseases, pests and weeds in spring fruit trees can greatly reduce the risk of prevention and treatment in summer and autumn, laying a good foundation for fruit production in the year. Accurate use of pesticides is very important in fruit tree production.
Orchard use pesticides pay attention to what? Before the purchase of pesticides, it is necessary to clarify the target of prevention and treatment, and to prescribe the right medicine. When purchasing pesticides, pay attention to the following points to avoid buying fake drugs and causing losses. The first is that the purchased pesticides must have four certificates: a pesticide registration certificate, a production license, a pesticide standard number, and a product certification. For those who have incomplete evidence, they must prevent "counterfeiting". The second is to pay attention to the effective period of pesticide use, the general water pesticide is valid for 1 year, powder 2 years, EC 3 years, you can look at the details of the production date and the expiration date. The third is to look at pesticide packaging, should be complete without damage or spillage, powder pesticides without agglomeration, emulsion pesticides without stratification, water pesticides without precipitation, particle pesticides meet standards, particle size uniformity. Fourth, it is best to use pesticides that are both palliative (multi-effect) to achieve a multi-drug effect.
Placement of pesticides: Pesticides are toxic to humans, livestock and poultry and must be stored separately and separated from food, humans and animals, and clothing. It is advisable to have a separate pesticide storage room and storage tank to avoid accidental feeding or chronic poisoning. .
The correct and reasonable combination of pesticides can improve efficacy, treat several pests and diseases, reduce the amount of drugs used, reduce costs, and sometimes can improve the efficacy, reduce toxicity, reduce the resistance of pathogenic pests to pesticides, or control the emergence of resistant pests. .
Some of the pesticides are mixed in advance by the factory into a mixture, diluted with water before use. Liquid dosage forms such as emulsifiable concentrates and wettable powders can be blended and used.
Mixed use of pesticides should have a clear purpose, and the principles followed by them include: a reasonable cost, and does not affect the chemical stability of the active ingredient and does not destroy the physical properties of the pharmaceutical agent. After mixing, the toxicity does not increase, and the toxicity and residue are not higher than that of a single agent. The drug efficacy is reasonable, one must also treat different pests and diseases; second, there must be synergies, and actively promote the use of pesticide synergists, such as multi-functional plant synergists; Third, pay attention to the cooperation of different modes of action. Most of the mixed pesticides should be used with the mix. For new mixed formulations, they need to be tested before use.
Note that pesticides are forbidden to be mixed in the following situations: pesticides which are easily decomposed by alkaline substances and reduce efficacy or even failure, cannot be mixed with alkaline pesticides, such as phoxim, pyrethroids, etc. cannot be combined with lime sulfur Alkaline agents such as Bordeaux mixture are used. Pesticides that are destructive to the emulsion after mixing cannot be mixed. Organic sulfur and organophosphorus pesticides cannot be mixed with pesticides containing copper preparations. Microbial source insecticides and systemic organophosphate insecticides cannot be mixed with fungicides.
In addition, we must pay attention to pesticide safety interval. The safety interval is the period from the last application to the crop harvesting (harvesting), from the time after spraying to the time required for the residue to fall to safety standards. In the use of pesticides in orchards, the time between the last spraying and the harvest must be greater than the safety interval to prevent human and animal poisoning.
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