Washington Pesticide Laws and Safety Exam
Questions and Answers with Verified
Solutions | Latest Updated 2026
IPM using more than one pest mgmt strategy
to control a pest
economic injury level pest pop density that causes losses equal
to control measure costs
economic threshold pest pop density where control need to
happen to avoid reaching economic
injury lvl
cultural pest control crop rotation or pruning
adjuvant substances added to pesticide mixtures
to increase safety or effectiveness
Restricted vs General use restricted can only be sold by certified
pesticides applicators and are more dangerous
dealer manager requirements Restricted PSTC sold must be in original
unbroken container with registered label
attached
WA state penalty $7.5k and/or license suspension
, Emulsifiable concentrate heterogenous and milky
often high phototoxicity
corrosive, fast skin absorption
Flowable fine solid particles suspended in liquid
consistently agitate so particles don't
settle
clogs
Wettable Powders (WP) Not entirely soluble
Require agitation to keep them in solution
abrasive to spray equipment.
Microencapsulated (ME) dry particles or in capsules that break
when wet. slow release
long restricted entry/pre-harvest
intervals
picked up by bees can contaminate hives
Invert emulsion A.I. dispersed in oil instead of water.
larger droplet size
PSTC compatabililty test steps 1. put in clear glass jar
2. add in order: water, dry formulations,
liquid formulations, solution products,
surfactants/other adjuvants, emulsion
products
3. Shake vigorously, let stand for 15 min.
Don't use anything that creates
scum/clumps, or heat
Questions and Answers with Verified
Solutions | Latest Updated 2026
IPM using more than one pest mgmt strategy
to control a pest
economic injury level pest pop density that causes losses equal
to control measure costs
economic threshold pest pop density where control need to
happen to avoid reaching economic
injury lvl
cultural pest control crop rotation or pruning
adjuvant substances added to pesticide mixtures
to increase safety or effectiveness
Restricted vs General use restricted can only be sold by certified
pesticides applicators and are more dangerous
dealer manager requirements Restricted PSTC sold must be in original
unbroken container with registered label
attached
WA state penalty $7.5k and/or license suspension
, Emulsifiable concentrate heterogenous and milky
often high phototoxicity
corrosive, fast skin absorption
Flowable fine solid particles suspended in liquid
consistently agitate so particles don't
settle
clogs
Wettable Powders (WP) Not entirely soluble
Require agitation to keep them in solution
abrasive to spray equipment.
Microencapsulated (ME) dry particles or in capsules that break
when wet. slow release
long restricted entry/pre-harvest
intervals
picked up by bees can contaminate hives
Invert emulsion A.I. dispersed in oil instead of water.
larger droplet size
PSTC compatabililty test steps 1. put in clear glass jar
2. add in order: water, dry formulations,
liquid formulations, solution products,
surfactants/other adjuvants, emulsion
products
3. Shake vigorously, let stand for 15 min.
Don't use anything that creates
scum/clumps, or heat
