Major Categories of Agricultural Pesticides
Pesticides are categorized based on their target pest organism, chemical structure, and specific physiological mode of action.
- Insecticides: Control damaging insect pests; include synthetic chemistries (neonicotinoids, pyrethroids, organophosphates, diamides) and biologicals (Bt, entomopathogenic fungi).
- Fungicides: Prevent and cure fungal diseases including blights, rusts, smuts, and mildews; span contact protectants (mancozeb, copper) and systemic compounds (triazoles, strobilurins).
- Herbicides: Manage competitive weeds in field crops; divided into pre-emergence herbicides (applied before weed emergence) and selective post-emergence weedicides.
- Rodenticides and Nematicides: Specialized baits and soil applications targeting rodent populations and microscopic soil-dwelling plant-parasitic nematodes.
- Bio-Pesticides: Environmentally benign pest control agents derived from natural botanical extracts (neem Azadirachtin) or antagonistic microbes (Trichoderma, Beauveria).
Integrated Pest Management (IPM) and Resistance Prevention
Responsible agronomy emphasizes IPM practices that minimize chemical exposure while maintaining economic pest control.
- Economic Threshold Level (ETL): Scout fields systematically; apply chemical pesticides only when pest density reaches levels capable of causing significant financial loss.
- Biological and Mechanical Measures: Install pheromone traps, light traps, and bird perches, and encourage beneficial natural predators like spiders and ladybird beetles.
- Mode of Action Rotation: Prevent chemical resistance by rotating products with different IRAC (insecticides) or FRAC (fungicides) classification codes.
- Targeted Spot Spraying: Spray only infected crop patches rather than conducting whole-field blanket applications whenever pest damage is localized.
Applicator Safety and Pre-Harvest Guidelines
Strict adherence to statutory safety protocols protects farm workers from occupational exposure and prevents toxic food residues.
- Personal Protective Equipment (PPE): Always wear chemically resistant rubber gloves, protective face masks, goggles, and full-length protective clothing during preparation and spraying.
- Pre-Harvest Interval (PHI): Observe the statutory waiting period between final chemical application and crop harvesting to ensure residues fall below Maximum Residue Limits (MRL).
- Sprayer Calibration: Clean nozzles and calibrate water volume to prevent dripping and overspray.
- Container Disposal: Triple-rinse empty chemical bottles, puncture them, and dispose of them through authorized waste management channels; never reuse containers for domestic or livestock purposes.
Official source
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Common questions
What is the Pre-Harvest Interval (PHI) in agricultural pesticide use?
PHI is the mandatory minimum number of days that must elapse between the last pesticide spray and crop harvesting to ensure pesticide residues safely break down below legal limits.
What agency regulates agricultural pesticides in India?
The Central Insecticides Board and Registration Committee (CIBRC), under the Ministry of Agriculture and Farmers Welfare, regulates the import, manufacture, sale, and use of all pesticides.
Why should pesticide chemical groups be rotated?
Rotating chemical groups with different modes of action prevents target pests and pathogens from developing genetic resistance, maintaining long-term chemical effectiveness.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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