Scientific selection of pesticides for prevention and control of diseases and insect pests in pollution-free vegetables

At present, it is difficult to produce pollution-free vegetables without pesticides, plant hormones and chemical fertilizers, but the use must be strictly controlled and organic chemical pesticides with high efficiency, low toxicity and low residues are allowed to be used to a limited extent. it is strictly forbidden to use pesticides that are highly toxic, highly toxic, high residue and have the effect of "carcinogenicity, teratogenicity and mutagenicity". Promote the use of chemical pesticides with high efficiency, low toxicity and low residue, and use in conjunction with other control measures to scientifically screen chemical pesticides and optimize the allocation of chemical pesticides. Strictly enforce the standards for the safe use of pesticides, especially the safe interval between the use of pesticides before vegetable harvest. Adhere to the principle of up-to-standard prevention and control of diseases and insect pests, do not use drugs if you do not meet the prevention and control standards, and overcome the bad habit of blindly misusing pesticides. The prevention and control of diseases and insect pests should start from the seedling field, control and reduce the number of drug use, and ensure that the toxic residues in vegetables do not exceed the national standards.

Prohibition of pesticides with high toxicity and high residue

In the prevention and control of vegetable diseases and insect pests, there are many kinds of chemical pesticides that can be used, but they must be strictly controlled and the use of pesticides with high toxicity and high residue is prohibited. For example, highly toxic pesticides such as 3911, 1605, 1059, 666, DDT, carbofuran, methyl isophos, methamidophos, zinc phosphide, omethoate, monocrotophos, chlordimeform, dicofol, fluoroacetamide, organic mercury preparations and other highly toxic pesticides are strictly prohibited.

Permissible fungicides for control of fungal diseases in vegetables

The fungicides allowed to control vegetable fungal diseases in the production of pollution-free vegetables are as follows: 75% chlorothalonil, 70% mancozeb, 80% ethylphosphine, 75 metalaxyl, 72% chlorpromazine, 58% metalaxyl, 1500 times, 1000 times, 50% carbendazim, 50% carbendazim, 50% carbendazim 1000 times, 50% methyl thiophanate 500 times, 64% poison alum 500 times, 34% green copper 500 times, 80% anthrax Fumei 500 times, and so on. Among them, carbendazim (carbendazim) and disinfectant alum are compound drugs. Chemical spray generally uses 50-70 kg per mu, less in seedling stage or leafy vegetables.

Permissible dust agents

The dust agents allowed to be used are: 20% (or 40%) chlorothalonil aerosol 300 g / mu, 50% chlorothalonil dust 1 kg / mu, 10% (or 20%) Shu Ke aerosol 300 g / mu, 10% decontamination powder 1 kg / mu, as well as propofoin aerosol and dimethoate powder and so on. In addition, 350 g / mu of aphid smoke agent can be used to control aphids. Dust agents are mostly used in protected areas, which not only has high efficacy, but also does not increase the humidity in the shed, so as to reduce the occurrence of diseases.

Permissible pesticides for the control of bacterial diseases in vegetables

Allowed to control bacterial diseases of vegetables are: 500-10 million units of agricultural streptomycin 4000 times, 50% copper succinate 500 times, 30%DT fungicides, 50% Fengfuan 500 times, 27% copper high suspension, 34% green milk copper 500 times, 77% can kill 500 times, and so on.

Permissible agents for the control of vegetable virus diseases

The permissible agents for the prevention and control of vegetable virus diseases are as follows: 300x solution of Shiduqing plus 2000-fold solution of 50% aphid mist (for aphids), 300x solution of 5% Shiduqing, 500X solution of 1.5% Zhanshuling, 200x solution of 83-1 enhancer, 800x solution of zinc sulfate, 1000 fold solution of Lvfenwei 1, 500x solution of 20% virus A, 400x solution of antitoxin No. 1, 500x solution of antitoxin, 500x solution of trisodium phosphate, and so on. At the same time, milk and glucose can be sprayed on the leaves, and foliar fertilizer containing phosphorus, potassium and zinc can also be sprayed. In addition, in the vaccination of the virus vaccine, such as 100 times liquid attenuated virus vaccine 14N dipped in the root for half an hour, can prevent tomato virus disease.

Permissible pesticides to control vegetable pests

The control agents of leaf miner: 25% Aktai water dispersible granule 3000 × 5000 times, 25% Ikas 1000 times, 20% chrysanthemum EC 2000 times, 21% killing EC 3000 times, etc. In addition, you can also use Aifuding, Green Caibao, Cytamine, an Lubao, Chong Chong\ Guang, Saikai (generally 70 kg per mu), or yellow board to trap and kill adults.

Control of powdery mildew lice: 25% Aketai water dispersible granules 2500-5000 times, 25% buprofezin 2000 times, 10% Wanling 1000 times (60 kg per mu), or 350g / mu.

The insecticides for the control of tea yellow mites are as follows: 73% mites 1000 times, 25% mites fierce 1500 times, 10% mimetiojing 3000 times, 1.8% mites 8000 times, 15% chlorpromazine 2500 times 3000 times, and so on.

Aphid control agents: 5% Aketai water dispersible granules 5000 times, 25% Eckas 1000 times, 10% Wanling 1000 times, 50% aphid mist 2000 times, 10% imidacloprid 4000 times, 10% acetamiprid 300 times, can also use aphid fumigant 250g / mu. In addition, silver gray objects can also be used to drive aphids or yellow boards to trap and kill.

Control of cotton bollworm and cabbage worm and other agents: 5000 times of 25% Kung Fu EC, 1000 times of Uranus (bifenthrin) 10% EC, 3000 times of killing (usually 50 kg per mu). In addition, the adults can be trapped and killed.