I. Safety intervals of commonly used pesticides on vegetables
1. Bactericide: 75% chlorothalonil wettable powder for 7 days, 77% of WP for 3-5 days, 50% of acetaminophen WP for 4-7 days, 70% thiophanate-methyl Wet powder 5-7 days, 50% nongren wettable powder 4-5 days, 58% thiram Mn-Zn wettable powder 2-3 days, 64% antitoxic WP 3-4 days.
2. Insecticide: 10% cypermethrin EC for 2-3 days, 2.5% bromperthrin for 2 days, 2.5% kungfu EC for 7 days, 5% rifampicin EC for 3 days, and 5% anti-CPW WP for 6 days , 1.8% efotin EC for 7 days, 10% faster to kill enemy EC for 3 days, 40.7% LOSUN EC for 7 days, 20% chlorhexidine EC for 3 days, 20% fenvalerate EC for 5 days, 35% volt Parathion for 7 days, 20% fenpropathrin emulsifiable concentrate for 3 days, 10% malpractiform emulsifiable concentrate for 7 days, 25% quetiapris emulsifiable concentrate for 9 days, 50% anticonvulcan WP for 6 days, more than 5% Po WP 7 days.
3. Acaricide: 50% Bromoxime EC for 14 days, 50% Torc WP for 7 days.
II. Matters needing attention when using pesticides in vegetables
1, choose low toxicity pesticides. With the continuous development of the chemical industry, there are more and more kinds of pesticides, and there is a wide range of pharmaceutical agents that can be used to control a certain pest and disease. For the safety of humans and animals, under the premise that pests and diseases can be prevented, low-toxic and low-residue pesticides should be selected.
2, the drug concentration should be low. When the selected pesticide species is determined, the lower limit of the drug efficacy range should be selected when formulating the pharmaceutical agent. Because the application of low-concentration liquid medicine is to ensure the safety of humans and animals, the cost can be reduced, and the resistance of individuals with residual pests can be prevented, thereby prolonging the service life of pesticides.
3, alternating use of various pesticides. Due to the wide variety of diseases and pests in vegetable fields, the development speed is fast and the application is frequent. If the same agent is administered continuously, the control subjects will develop resistance to the agent and the efficacy will be reduced. For this reason, some different kinds of medicaments with the same efficacy should be used interchangeably to avoid the occurrence of resistance.
4, medication should pay attention to time. The so-called time-dependent use of drugs has two meanings: First, in the event of pests and diseases, to seize the opportunity to use drugs in time, the sooner the better, so as not to miss the best time to produce efficacy; Second, according to the growth period of vegetables to the medication Adjust the concentration and quantity of pesticides because the different growth periods of vegetables require different concentrations and quantities of liquid medicine.
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