🎒 Pesticide Formulations and Application

This lesson builds core elective concepts in BSc Agriculture with practical applications and exam-oriented clarity.

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Pesticide Formulations and Application

A pesticide formulation is the physical form in which a pesticide active ingredient is prepared for practical use. The active ingredient (a.i.) is combined with inert materials, solvents, carriers, and adjuvants to make it effective and safe for application.

Types of Pesticide Formulations

Abbreviation	Formulation Type	Description
EC	Emulsifiable Concentrate	Liquid a.i. dissolved in organic solvent with emulsifier; mixes with water
WP	Wettable Powder	Dry powder mixed with water; needs constant agitation
SP	Soluble Powder	Dissolves completely in water
SC	Suspension Concentrate	Finely ground a.i. suspended in liquid; ready to dilute
SL	Soluble Liquid	Water-soluble concentrate
GR	Granules	Ready-to-use granular form; applied to soil or water
D	Dust	Fine powder for direct application without mixing
WG/WDG	Water Dispersible Granules	Granules that disperse in water; less dust than WP
CG	Capsule Suspension	Microencapsulated a.i. for slow release
ULV	Ultra-Low Volume	Highly concentrated; applied in very small volumes

Adjuvants and Additives

• Surfactants (spreaders) — reduce surface tension for better coverage
• Stickers — help pesticide adhere to leaf surface; resist rain wash-off
• Emulsifiers — enable oil-based formulations to mix with water
• Safeners — protect crops from herbicide injury

Application Equipment

Equipment	Usage
Knapsack sprayer (manual)	Small farms, kitchen gardens; 15-16 L capacity
Power sprayer (engine-operated)	Medium to large farms; higher pressure and coverage
Mist blower	Orchard and plantation crops; produces fine droplets
Drone sprayer	Large-area precision application; emerging technology
Duster	Application of dust formulations
Granule applicator	Soil application of granules (paddy, sugarcane)
Seed treater	Coating seeds with fungicides or insecticides

Dosage Calculation

To calculate the quantity of commercial product needed:

Formula: Quantity of formulation (g or mL) = (Recommended dose of a.i. per ha) / (% a.i. in formulation) x 100

Example: If the recommended dose is 500 g a.i./ha and the product is 50% WP:

• Quantity = (500 / 50) x 100 = 1000 g of product per hectare

Spray Volume Guidelines

Crop Type	Spray Volume (L/ha)
Field crops (rice, wheat)	500-700
Vegetables	500-1000
Orchards	1000-2000
ULV application	1-5

Safe Handling Practices

• Read the label carefully before use — it is the law
• Wear PPE (gloves, mask, goggles, long-sleeved clothing)
• Do not eat, drink, or smoke during application
• Spray downwind to avoid exposure
• Triple-rinse empty containers before disposal
• Maintain the pre-harvest interval (PHI) before marketing produce
• Store pesticides in original containers, locked away from food, children, and animals

Proper formulation selection, accurate dosage, and safe application practices are the foundation of effective and responsible pesticide use.

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Summary Cheat Sheet

Topic	Key takeaway
Main focus	Pesticide Formulations and Application — types of formulations, application equipment, dosage calculation, and safe handling practices.
Section context	Revise this lesson with the rest of Application, Safety & Integration for stronger conceptual continuity.