How did Apple hit the last drug before picking?
Adhere to the use of pollution-free pesticides with high toxicity and high residual pesticides. Production should be resolutely prohibited; in the production of apples, biological non-polluted pesticides, plant pesticides, and new bactericides should be adhered to. Their common features are significant and stable control effects. Long-lasting, no residue or low residue, no pollution on fruit surface and environment, not easy to produce drug resistance, no pollution.
There should be little or no resistance to pesticides. Because of the long-term application of pesticides, the resistance of pests to drugs will increase, their lethality will be limited, and some may even cause a large number of pests and diseases. For example, maggots and mites have resistance to grape pesticides, dimethoate, omethoate, and spotted defoliants against thiophanate-methyl, carbendazim, and have little or no efficacy after spraying.
Pay attention to the correct use of the traditional bactericidal drug lime sulfur should be used with the preparation with the application, after the preparation of a long time do not reduce the efficacy, dormant application in apple production, improper use of flowering, will result in fruit drop, pollution Fruit surface; Lignosulfide mixture can not be mixed with organic phosphorus pesticides and other bogey pesticides, otherwise the acid-base mixture, efficacy is reduced or invalid, it will not achieve control effect, lime sulfur is not suitable with the same alkaline Bordeaux Mixed use of liquids, a mixture of the two will occur chemical reactions, reduce efficacy, the occurrence of phytotoxicity, the two have to use the interval should be more than 20 days.
Lime-sulfur mixture can not be used for a long time, otherwise it will produce drug resistance, and the higher the concentration, the faster the formation of drug resistance, should be used interchangeably with other pesticides. Bordeaux mixture cannot be mixed with lime sulfur, organic arsenic germicide, organic sulfur fungicide, and organic phosphorus germicide. Because apples are less sensitive to copper ions and lime, they can be used in multiple or multiple proportions.
Pay attention to the rational use of pesticides mixed with a variety of pesticides, saving labor, but also prevent the emergence of drug resistance, mixing should pay attention to mixed failure can not be used after; mixed toxicity can not be used after the increase. Should be used with the mix. General acaricides and insecticides can be used in combination; the systemic adsorbent and contact agent can be used in combination; fungicides can be mixed with insecticides.
Knowing how much pesticide residues in fruit last determined by the last drug use time has a greater impact on quality. Strictly control the time of the last medication. The last medication should be sprayed before 20 days in order to ensure that pesticides in fruits do not have residues. Or a small amount of residue does not exceed the standard.
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