pesticide formulations dr- ahmed abdel-megeed

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Pesticide Formulations Dr. Ahmed Abdel-Fattah A. Abdel-Megeed PhD Hamburg University, Germany Plant Protection Department Pesticides Chemistry and Environmental Toxicology Alexandria University

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Page 1: Pesticide formulations Dr- Ahmed Abdel-Megeed

Pesticide Formulations

Dr. Ahmed Abdel-Fattah A. Abdel-Megeed PhD Hamburg University, Germany

Plant Protection Department Pesticides Chemistry and Environmental Toxicology

Alexandria University

Page 2: Pesticide formulations Dr- Ahmed Abdel-Megeed

Why Formulate Pesticides ??!

• Pesticides are rarely applied in their technical form.

• They are usually formulated to improve– Handling– Storage– Application– Effectiveness– Safety

Page 3: Pesticide formulations Dr- Ahmed Abdel-Megeed

Terminology for Formulations

• AI = active ingredient, chemicals that are responsible for the pesticidal effect

• Inert ingredient = any substance in a pesticide formulation having no pesticidal action

• Formulation = the way a pesticide is prepared for practical use

• Carrier = inert liquid or solid added to an active ingredient to prepare a pesticide formulation

Page 4: Pesticide formulations Dr- Ahmed Abdel-Megeed

Terminology for Formulations

• Diluent = any liquid or solid material used to dilute an active ingredient. In liquid formulations, water or oil is used; in dry formulations, talc, clay or other fine dust is used

• Emulsifier = a chemical that aids in suspending one liquid in another

• Emulsion = a mixture of one liquid in another liquid

Page 5: Pesticide formulations Dr- Ahmed Abdel-Megeed

Terminology for Formulations

• Wetting agent = a chemical which causes a liquid to contact surfaces more thoroughly

• Suspension = a mixture of fine solid particles in a liquid

• Soluble = dissolves in a liquid• Surfactant = increases the emulsifying, dispersing,

spreading, and wetting properties of a formulation

Page 6: Pesticide formulations Dr- Ahmed Abdel-Megeed

Types of Formulations

• Emulsifiable concentrates• Wettable powders• Solution• Dusts• Aerosols• Granular formulations• Baits• Microencapsulated products

Page 7: Pesticide formulations Dr- Ahmed Abdel-Megeed

Emulsifiable Concentrates• Designated by E or EC– Examples are Dursban 2E, Prevail TC, Gentrol,

Dursban Pro, Archer, Dragnet– 2E stands for 2 lbs/gal

• AI + solvent + emulsifier = EC • EC + water = emulsion• Emulsion is a fine suspension of oil droplets in

water and appears milky in color• They do not require constant agitation prior to

each application

Page 8: Pesticide formulations Dr- Ahmed Abdel-Megeed

Emulsifiable Concentrates

• Advantages – Bind well to fabrics and fibers in carpet.– Easy to mix and use– Spreads evenly over foliage– Binds well to soil particles

Page 9: Pesticide formulations Dr- Ahmed Abdel-Megeed

Emulsifiable Concentrates

• Disadvantages – Mild to strong odors– Absorption onto porous surfaces– Potential burning of plant material– Errors in mixing the concentrate with water– Some surfaces such as plastic or tile may be

damaged– Can easily penetrate skin

Page 10: Pesticide formulations Dr- Ahmed Abdel-Megeed

Wettable Powders• Desginated by W or WP– Examples of wettable powders are Demon WP, and

Tempo WP– 50WP stands for 50% WP

• AI + carrier + wetting agent = WP • WP + water = suspension• Suspensions are fine particles suspended in

water• Suspensions require constant agitation prior to

each application

Page 11: Pesticide formulations Dr- Ahmed Abdel-Megeed

Wettable Powders

• Advantages– No oil based solvents– Low to no odor– Little hazard of burning plants– Little hazard of penetrating skin– Do not absorb into porous surfaces, when water

evaporates, powder sits on surface and is readily picked up by insects

Page 12: Pesticide formulations Dr- Ahmed Abdel-Megeed

Wettable Powders

• Disadvantages– Inhalation of particles while mixing concentrate– Constant agitation of suspension prior to and during

application– Large mesh strainer must be used (>50 mesh) in sprayers– Pumps and nozzles can be damaged by abrasion of the

particles– Visible residues can occur on dark surfaces

Page 13: Pesticide formulations Dr- Ahmed Abdel-Megeed

Solution

• Technical pesticide + diluent = solution• Designated with SP = Soluble Powder, or SC =

Soluble Concentrate• Example Premise SC, Termidor SC, Bora-

Care• Advantage is also a solution• Form clear liquids for spraying

Page 14: Pesticide formulations Dr- Ahmed Abdel-Megeed

Dusts• Designated by D– Examples of dusts are Deltadust, Ficam D, Drione, Sevin

D, and malathion D– 5D represents 5% D

• Technical pesticide + dry carrier = dust• Dusts cannot be mixed with water and must be applied

dry• Common carriers are clay, talc, silica gel, or diatomaceous

earth• Some dusts are the insecticide themselves like boric acid

or diatomaceous earth

Page 15: Pesticide formulations Dr- Ahmed Abdel-Megeed

Dusts

• Advantages– Long lasting— they often do not break down– Low odor– Easy to apply– Not absorbed into surfaces and are readily

picked up by pests– If spilled, dusts can be easily cleaned up

Page 16: Pesticide formulations Dr- Ahmed Abdel-Megeed

Dusts

• Disadvantages– Readily become airborne and can contaminate

non-target surfaces– Readily inhaled by the applicator, technicians

should wear a respirator for application– Can be abrasive, and eye protection should be

worn

Page 17: Pesticide formulations Dr- Ahmed Abdel-Megeed

Aerosols

• AI + solvent + propellent + nozzle = aerosol • Technical insecticide + propellent = aerosol• Examples of aerosols are Wasp Freeze, ULD-BP-

50, Ultracide, UltraGuardian• Propellents may be butane

Page 18: Pesticide formulations Dr- Ahmed Abdel-Megeed

Aerosols

• Advantages– Ease of use– Ease of storage– No dilution or storage of concentrates

• Disadvantages– Expensive– Odor of solvents– Atomized droplets are easy to inhale and drift to non-

target surfaces

Page 19: Pesticide formulations Dr- Ahmed Abdel-Megeed

Granular Formulations

• Designated by G• Technical pesticide + clay = granules• Examples of granular formulations are

Dursban G, Talstar G• 2.5G represents 2.5% G

Page 20: Pesticide formulations Dr- Ahmed Abdel-Megeed

Granular Formulations•Advantages

–Low drift–Ease of application

–Long residual life outdoors•Disadvantages

–Water is required to release the insecticide•Although some manufacturers are overcoming this aspect

–Limited to outdoor application–Application equipment must be calibrated often

Page 21: Pesticide formulations Dr- Ahmed Abdel-Megeed

Baits

• AI + food base = bait– Food base can be liquid, meal, seed, pellet, bait

block, or gel• Some baits are packaged in childproof bait

trays• Examples of baits are MaxForce FC, Siege,

Recruit, Drax, Dual Choice, Firstline, Niban, Amdro

Page 22: Pesticide formulations Dr- Ahmed Abdel-Megeed

Baits

• Advantages– Easy to use– Little or no mixing– Readily control pests moving into or out of an area

• Disadvantages– Other food sources compete with baits– Very specific for certain species of pests– Can be attractive to children or pets

Page 23: Pesticide formulations Dr- Ahmed Abdel-Megeed

Microencapsulated products

• Often referred to as ME (microencapsulated emulsion), FM (flowable microencapsulated), CS (Capsulated suspension)

• AI + plastic polymer + emulsifiers = ME– The capsules enclose the insecticide and protect it

from degradation and release the insecticide slowly• Examples of MEs are Demand CS

Page 24: Pesticide formulations Dr- Ahmed Abdel-Megeed

Microencapsulated products

• Advantages– Long term control– Low odor– Safety— if swallowed the capsules do not release the

insecticide– No absorption into surfaces

• Disadvantages– Require constant agitation– May leave visible residues on dark surfaces– Not effective in wet areas

Page 25: Pesticide formulations Dr- Ahmed Abdel-Megeed

Fumigants

• Gaseous insecticides usually packaged under pressure and stored as liquids

• Some are tablets or pellets that release gas when mixed with water

• Examples of fumigants are sulfuryl fluoride (Vikane) and methyl bromide (Meth-o-gas), Phostoxin (aluminum phosphide)

Page 26: Pesticide formulations Dr- Ahmed Abdel-Megeed

Fumigants

• Advantages– Toxic to a wide variety of pests– Good penetration of target areas– Single treatment will usually kill al pests in treated

area• Disadvantages– Treated area must be closed or tented to prevent gas

from escaping– Highly toxic to people

Page 27: Pesticide formulations Dr- Ahmed Abdel-Megeed

Thank You