Pesticides are used for the prevention and control of harmful organisms (pests, pest mites, nematodes, pathogens, weeds and rats) and chemical and biological drugs and regulate plant growth. A variety of additives, which are commonly used in health and in improving the physicochemical properties of the active ingredient, are also included.
2. Classifications and dosage forms
According to the source of raw materials, pesticides can be divided into organic pesticides, inorganic pesticides, botanical pesticides, microbial pesticides. In addition, there are insect hormones. According to the formulation process, pesticides can be divided into powder, wettable powder, soluble powder, emulsion, missible oil, concentrated emulsion, cream, paste, gel, smoking agent, fumigants, aerosols, oil agent, granules and particulate agent and so on. Most are liquid or solid, and a few are gas.
According to the control object, pesticides can be divided into insecticide, fungicide, insecticide, pest control agent, killing agent, herbicide, leaf, plant growth regulator, etc.
According to the formulation process, pesticides can be divided into wettable powder, soluble powder, emulsion, missible oil, concentrated emulsion, cream, paste, gel, smoke agent, fumigants, aerosols, oil agent, granules and particulate agent.
Pesticides are liquid or solid form and gas. Depending on the physical properties of the pests or diseases and the physical properties of the pesticides, use different usage. For example, make into powder to spread into aqueous solution, suspension, emulsion injection, or in the form of vapor or gas fumigation.
3. Botanical Pesticides
Plant growth regulator: the artificial synthesis of plant growth and development of a regulatory role of chemical substances known as plant growth regulators.
The characteristics of plant growth regulators are different from traditional pesticides. The plant growth regulator has the advantages of high toxicity, low dosage, low toxicity, high efficiency, low dosage, low dosage, high efficiency, easy production, etc., and is different from the traditional pesticide, such as high toxicity, high residue, easy to produce resistance.
Prometryn, pendimethalin, paraquat, quizalofop-p-ethyl, methylchloro phenoxyacetic acid, imazethapyr, fomesafen, clomazone, benazolin, haloxyfop-r-methyl
4. Using Methods
Powder, wet powder, soluble powder, emulsion, ultra low volume preparation, granule and granule, slow release agent, smoke agent
According to the agricultural production of commonly used pesticide toxicity evaluation (acute oral and skin toxicity, chronic toxicity), the hazard can be divided into high toxicity, medium toxicity and low toxic.
6. Environmental Pollution
1) Atmospheric pollution, water environment, cause soil compaction
2) Enhance the resistance of pathogens and pests to pesticides
3) Killing useful life
4) Wild animals and livestock poisoning
1) The reason of pesticide itself
2) The reasons of the prevention and control objects
3) Environmental reasons
8. Improve Efficacy
1) Observe temperature
2) Observe humidity
3) Observe the sun
4) Observe the rain
5) Observe the wind