Non-polluted vegetables mainly refer to vegetables that have not been contaminated by harmful substances. In other words, commercial vegetables do not contain certain toxic substances that are not allowed to be contained, and some unavoidable harmful substances are controlled within the permissible standards. How to use pesticides when cultivating pollution-free vegetables? China Pesticide Network Xiaobian gives you the trick:
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First, the right medicine: When deciding to use the medicine, we must first clear the control object, and then the right medicine. When two or more different types of diseases are mixed, it is necessary to use the symptomatic pesticide to prepare a mixed medicine for prevention and treatment.
Second, timely medication: seize the key period of prevention and control: according to the age of the insects, living habits, outside air temperature, seize the critical time for human and livestock and crop safety, such as the control of tobacco budworms should be before the larvae third instar (the larvae did not break into Before the pepper fruit) the effect of drug control is good;
Adults of Spodoptera litura are clustered before spawning, and the larvae of the third instar are clustered. At this time, the control effect is best. Some pesticides are easily decomposed and decomposed under high temperature and strong light, while some larvae have night activities. Habits, so choose to apply the effect in the evening.
Third, the rational use of drugs and the number of applications: no matter which kind of pesticide , the application concentration or dosage should be appropriate, according to the instructions, according to the specified dilution concentration and dosage and application interval. Do not increase the concentration and increase the number of applications, so as not to cause phytotoxicity, environmental pollution and resistance.
4. Choose the appropriate dosage form and appropriate mixing method: First choose low-residue pesticides. Each dosage form has its own characteristics and advantages. For example, the use of granules is safe for humans and animals, does not pollute the environment, and is a natural enemy of pests. The effect is small, and the proper mixing of pesticides can prevent the occurrence of pest resistance, at the same time play a role in both the treatment and synergy, and can also reduce the number of medications. In addition, in order to avoid the resistance of germs and pests to pesticides and reduce the amount of pesticide residues, it is not allowed to use a single pesticide for a long time, and pesticide manufacturers should use them alternately.
5. Try to use non-toxic chemical agents and natural substances to control pests and diseases, such as 20% baking soda to control cucumber powdery mildew and anthracnose; use rice vinegar to control solanaceous virus disease and Chinese cabbage soft rot; and grass ash soaking solution, Waste tobacco leaf soaking liquid, ramie leaf soaking liquid, etc. can control a variety of pests such as aphids, mites, maggots, cabbage caterpillars, and diamondback moths.
The above is the precautions for the use of pesticides when cultivating pollution-free vegetables. Bio-pesticide experts remind everyone to understand the efficacy of scientific and rational use before using the medicine to improve the efficacy.
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