Pesticide Formulas – Study Guide

This post will go over most of my readers beans, but my brother requested my cheat sheets from when I took the Illinois Pesticide License test. Here is even a practice test for you!  Even if you’re spraying organic, you need to be licensed in the respected state you’re spraying in. I did always had to laugh at this logic strain in licensing:

The OPERATOR is the person who applies the pesticides, but must work under the supervision of an APPLICATOR. The APPLICATOR may or may not actually apply the pesticides. The APPLICATOR is the one with the specific license and the liability insurance.  Doesn’t these titles seem backwards?

PESTICIDE FORMULAS

DRY FORMULAS

SP = SOLUBLE POWDERS – Agitate to form a solution. Not many available as many don’t dissolve in H2O.

WP = WETABLE POWDERS – Contains wetting/dispersion agents + strong agitation form a suspension. Abrasive to pumps. Anti-foam adjuvants may help.

DF & WDG = DRY FLOWABLES & WATER-DISPERSIBLE GRANUALS – Formulated into a granule instead of a powder. Forms a suspension requiring strong agitation. Abrasive to pumps.

G = GRANULES – Applied directly. Most often used for soil treatment. H2O may need to be applied for activation.

P or PS = PELLETS – Usually larger than granules & more uniform in shape. Rat/insect baits.

D = DUSTS – Low % of active ingredient. Carrier of talc/clay/chalk. Apply directly. Watch for drift.

WET FORMULAS

E & EC = EMULSIFIABLE CONCENTRATES – Active ingredient in oil & w/mild agitation forms an emulsion mixture. Not abrasive to pumps, but may harm rubber or paint. Hazardous as drift & dermaly as it’s easily absorbed. Anti-foam adjuvants may help.

M & ME = MICROENCAPSULATED – Active ingredient in plastic coated capsule suspended in liquid. Time-released & long residual activity. Contstant agitation. Careful around beehives.

F & FL & L = FLOWABLES OR LIQUIDS – (Pre-suspended WP’s) Less inhalation hazard. Forms a suspension requiring moderate agitation. Abrasive to pumps.

S = SOLUTIONS –  A true solution. No agitation, residue or abrasion.

OTHER

A = AEROSOLS – Low % of active ingredients & ready to use. Under pressure.

B = POISON BAITS – Active ingredient mixed w/food or H2O. Usually in a bait box, for safety.

FUMIGANTS – Produce gas from a liquid. Need special license.

ADJUVANTS = A chemical that modifies or enhances a pesticide’s properties. NOT regulated, be careful.

DRIFT REDUCTION ADDITIVES = Increases droplet size to reduce drift.

STICKERS = Increases adherence of chemical increasing persistence.

SURFACTANT = “Surface-active agents” reduces the surface tension in H2O. Use on waxy or hairy leaves.

PENETRANTS = Oil (petroleum or veggie) that aids penetration of foliage.

BUFFERING AGENTS = Balances pH of carrier to keep pesticides active.

COMPATABILTY AGENTS = Allows effective mixing of 2 or more pesticides or w/fertilizer.

ANTI-FOAMING AGENTS = Reduces foam in EC or WP formulas.

PESTICIDE MIXTURES

CHEMICAL INCOMPATABILITY = An unnoticeable reaction of mixed pesticides, noticed when things go bad.

ANTAGONISM = Decreased activity. Never desirable.

SYNERGISM = Increased activity. Can be used to your advantage.

PHYSICAL INCOMPATABILITY = Caused by improper mixing, inadequate agitations, lack of stable emulsifiers, or hard H2O.

TANK MIXTURES

Label should have mixing order, but if not:

  1. CARRIER – Fill tank ¼ to ½ full.
  2. COMPATABILITY, BUFFERING, or ANTI-FOAMING AGENTS.
  3. DRIFT REDUCTION ADDITIVE – READ LABEL – May need to be added early or late in mix.
  4. WETABLE POWDERS
  5. DRY FLOWABLES & WATER-DISPERABLE GRANULES
  6. FLOWABLE & MICROENCAPSULATED
  7. EMULSIFIABLE CONCENTRATES
  8. SOLUTIONS
  9. SOLUABLE POWDERS
  10. SPRAY MODIFIERS – PENETRANTS & SURFACTANTS – Pre-slurry if using dry ingredients.
  11. CARRIER – Fill tank to desired level.

**Agitate mixture throughout mixing process & application.

TIMING OF APPLICATION

EPP = EARLY PREPLANT – Applied several weeks B/4 a crop is planted.

PPI = PREPLANT INCORPORATION – Applied prior to planting, worked into soil.

PrE = PREEMERGENCE – Applied during or soon after planting, but B/4 weeds emerge.

PoE = POSTEMERGENCE – Applied to foliage.

© Ilex Farrell ~ Midwestern Plant Girl

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