Hierarchy and Scope of Agricultural Pesticides
Under the Insecticides Act, 'pesticide' includes all substances used to prevent, destroy, repel, or mitigate pests affecting agriculture.
Different pest groups require entirely distinct chemical modes of action targeting their specific physiological biology.
- Fungicides: Specialized agents controlling fungal blights, rots, rusts, mildews, and damping-off
- Insecticides: Target destructive insect pests (borers, caterpillars, aphids, whiteflies, and termites)
- Herbicides: Suppress or eliminate unwanted grassy, broadleaf, and sedge weeds
- Rodenticides and Acaricides: Target rodents and plant-feeding mites respectively
Modes of Action: Systemic vs Contact
Both fungicides and insecticides are engineered in contact or systemic action profiles.
Contact chemicals form protective surface shields, whereas systemic products are absorbed into plant vascular sap to protect developing shoots from within.
- Contact fungicides: Inhibit fungal spore germination externally (e.g. Mancozeb, Copper Oxychloride)
- Systemic fungicides: Translocate through xylem/phloem to cure internal mycelium (e.g. Propiconazole, Azoxystrobin)
- Contact insecticides: Kill insects upon direct spray contact or surface grooming (e.g. Lambda-cyhalothrin)
- Systemic insecticides: Poison pests feeding on plant sap or internal stem tissues (e.g. Thiamethoxam, Flonicamid)
Integrated Pest Management (IPM) and Regulatory Discipline
Indiscriminate chemical application can lead to pest resurgence, secondary pest flare-ups, and beneficial insect mortality.
Growers should integrate cultural controls, biological bio-pesticides, and chemical rotations based on CIBRC label recommendations.
- Monitoring & ETL: Spray only after disease lesions or insect numbers surpass economic threshold levels
- Mode of action rotation: Alternate between different FRAC (fungicide) and IRAC (insecticide) groups to prevent resistance
- Operator safety: Wear personal protective equipment (gloves, mask, goggles) during all preparation and application steps
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
Is a fungicide considered a pesticide?
Yes, fungicide is a specific sub-category of pesticides designed exclusively to control fungal plant diseases.
Can an insecticide cure a fungal disease like powdery mildew?
No, insecticides only kill insects; they have zero biochemical activity against fungal pathogens.
What is the difference between contact and systemic fungicides?
Contact fungicides stay on the plant surface to prevent spore germination, while systemic fungicides penetrate plant tissues to cure internal infections.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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