Idaho Pesticide Applicators Certification
Final Exam Questions Fully Solved.
Weed management Strategies - Answer o mechanical - tillage, mowing, flooding.
o cultural - rotation, competition.
o Biological - bugs
o chemical - herbicides
Growth Regulator Herbicides - Answer Selective, Translocate
Example: 2,4-D
Amino Acid Synthesis Inhibitors - Answer non-selective, translocate
Example: Arsenal, Roundup
Lipid Inhibitor - Answer Selective, translocate, interfere with new hand growth
Seedling Growth Inhibitors - Answer prevent root or shoot development on seedling
Photosynthesis Inhibitors - Answer Interfere with photosynthesis
Example: Spike
Cell Membrane Disruptors - Answer Contact herbicides
Example: Gramoxone
Pigment Inhibitors - Answer Interfere with photosynthesis
Herbicide Application in Annual Life Cycle - Answer Seeding and vegetative
Herbicide Application in Biennial Life Cycle - Answer Seeding and Rosette
Herbicide Application in Perennial Life Cycle - Answer Seeding, bud, early flower, full flower,
, o Susceptibility - when a plant is killed by herbicide action
o Resistance - when a plant has evolved mechanism to survive a particular herbicide action.
Minimizing Herbicide Resistance - Answer o Tolerance - when a plant has historically survived
a particular herbicide action
o Susceptibility - when a plant is killed by herbicide action
o Resistance - when a plant has evolved mechanism to survive a particular herbicide action.
2,4-D - Answer Selective, growth regulator, high volatility, high potential for drift, peas, grapes,
and tomatoes very sensitive, grain and corn are not sensitive
Soil Residual Herbicides - Answer Last from several weeks to several years, LTR's (long-term
residual herbicides) kill most vegetation and leave soil nonproductive from one to several years
Nozzle types - Answer Solid stream, fan, cone
Nozzle materials: Carbide and Ceramic - Answer Most expensive, most resistant to abrasion
and corrosion
Nozzle materials: Stainless steel - Answer good resistance to abraision and corrosion,
moderately priced
Nozzle Materials: Brass - Answer resist corrosion but not abrasion
Nozzle materials: Aluminum - Answer inexpensive, resist some corrosion, wear quickly
Nozzle materials: Plastic - Answer Swell when exposed to organic solvents
Changing pressure with nozzle sprayers - Answer increasing pressure does not give a
proportional increase in output, so adjust pressure for minor changes in spray delivery rate
Change in travel speed with sprayers - Answer inversely proportional to speed of sprayer: 2x
sprayer ground speed reduces amount of spray by 1/2
Final Exam Questions Fully Solved.
Weed management Strategies - Answer o mechanical - tillage, mowing, flooding.
o cultural - rotation, competition.
o Biological - bugs
o chemical - herbicides
Growth Regulator Herbicides - Answer Selective, Translocate
Example: 2,4-D
Amino Acid Synthesis Inhibitors - Answer non-selective, translocate
Example: Arsenal, Roundup
Lipid Inhibitor - Answer Selective, translocate, interfere with new hand growth
Seedling Growth Inhibitors - Answer prevent root or shoot development on seedling
Photosynthesis Inhibitors - Answer Interfere with photosynthesis
Example: Spike
Cell Membrane Disruptors - Answer Contact herbicides
Example: Gramoxone
Pigment Inhibitors - Answer Interfere with photosynthesis
Herbicide Application in Annual Life Cycle - Answer Seeding and vegetative
Herbicide Application in Biennial Life Cycle - Answer Seeding and Rosette
Herbicide Application in Perennial Life Cycle - Answer Seeding, bud, early flower, full flower,
, o Susceptibility - when a plant is killed by herbicide action
o Resistance - when a plant has evolved mechanism to survive a particular herbicide action.
Minimizing Herbicide Resistance - Answer o Tolerance - when a plant has historically survived
a particular herbicide action
o Susceptibility - when a plant is killed by herbicide action
o Resistance - when a plant has evolved mechanism to survive a particular herbicide action.
2,4-D - Answer Selective, growth regulator, high volatility, high potential for drift, peas, grapes,
and tomatoes very sensitive, grain and corn are not sensitive
Soil Residual Herbicides - Answer Last from several weeks to several years, LTR's (long-term
residual herbicides) kill most vegetation and leave soil nonproductive from one to several years
Nozzle types - Answer Solid stream, fan, cone
Nozzle materials: Carbide and Ceramic - Answer Most expensive, most resistant to abrasion
and corrosion
Nozzle materials: Stainless steel - Answer good resistance to abraision and corrosion,
moderately priced
Nozzle Materials: Brass - Answer resist corrosion but not abrasion
Nozzle materials: Aluminum - Answer inexpensive, resist some corrosion, wear quickly
Nozzle materials: Plastic - Answer Swell when exposed to organic solvents
Changing pressure with nozzle sprayers - Answer increasing pressure does not give a
proportional increase in output, so adjust pressure for minor changes in spray delivery rate
Change in travel speed with sprayers - Answer inversely proportional to speed of sprayer: 2x
sprayer ground speed reduces amount of spray by 1/2
