MDARD COMMERCIAL PESTICIDE APPLICATOR TEST
PAPER 2025 QUESTIONS WITH ANSWERS RATED A+
✔✔Plants tolerant to drawdown (4) - ✔✔1. Bulrush
2. Cattail
3. Coontail
4. Sago pondweed
✔✔Plants whose predominance is enhanced by drawdown (3) - ✔✔1. Naiads
2. Milfoils
3. Curly-leaf pondweed
✔✔Why are there so few aquatic herbicides? - ✔✔The aquatic environment limits the
number of compounds effective for controlling pests and meet the rigid requirements
necessary for registration.
✔✔Ways herbicides are classified (3) - ✔✔1. Absorption characteristics
2. The plant processes that they affect
3. Selectivity
✔✔Contact herbicides are generally most effective on __________ _________ plants -
✔✔annual herbaceous
✔✔Plant processes affected by herbicidal activity (5) - ✔✔1. Cell division
2. Tissue development
3. Photosynthesis
4. Respiration
5. Nitrogen Metabolism and Enzyme Activity
✔✔At what growing stage are herbicides that affect cell division most effective? -
✔✔Preemergence
✔✔Plant growth regulators (PGRs) affect what process of plants? - ✔✔Tissue
development
✔✔Plant death may be ______ when the photosynthesis process is disrupted. -
✔✔Slow
✔✔Physical factors that contribute to susceptibility to selective herbicides (3) - ✔✔1.
Herbicide placement
2. Formulation
3. Rate of applicaiton
, ✔✔Biological factors that contribute to susceptibility to selective herbicides (3) - ✔✔1.
Physiological factors
2. Morphological factors
3. Stage of plant growth
✔✔At what point in the growth cycle are foliar-active herbicides the most effective for
perennial plants? - ✔✔Late and postflowering periods (when perennial plants are
translocating materials downwards towards the roots)
✔✔Low temperature affects herbicide efficiency by - ✔✔slowing growth, and therefor
slowing absorption
✔✔Methods used when managing aquatic weeds in flowing water (4) - ✔✔1. Trailing
hoses to aid the sinking of herbicides
2. Special herbicide formulations, such as slow-release pellets
3. Rapidly absorbed herbicides
4. Increased contact time via sequential applications or injection equipment
✔✔Particles suspended in the water affect the water's ability to transmit light. This is
known as what quality of the water? - ✔✔Turbidity
✔✔Aquatic pesticides are known to last a long time and accumulate in organisms. True
or False? - ✔✔False
✔✔What is the most common reason for herbicide-related fish kills? - ✔✔Lowering of
dissolved oxygen
✔✔How can the lowering of dissolved oxygen be limited? - ✔✔By limiting the amount of
vegetation killed off
✔✔The danger of fish kills is less in ______ water because it can hold more oxygen
than _____ water - ✔✔cooler, warm
✔✔Do not treat more than ______-_______% of the surface area of a body of water at
any given time - ✔✔30,50
✔✔How long should one wait if more than 50% of a lake area needs to be treated? -
✔✔2-3 weeks after the initial application
✔✔Ways pesticides break down when not absorbed by pest (4) - ✔✔1. Microbial action
2. Chemical
3. Photochemical
4. Adsorption (binding) to soil particles
PAPER 2025 QUESTIONS WITH ANSWERS RATED A+
✔✔Plants tolerant to drawdown (4) - ✔✔1. Bulrush
2. Cattail
3. Coontail
4. Sago pondweed
✔✔Plants whose predominance is enhanced by drawdown (3) - ✔✔1. Naiads
2. Milfoils
3. Curly-leaf pondweed
✔✔Why are there so few aquatic herbicides? - ✔✔The aquatic environment limits the
number of compounds effective for controlling pests and meet the rigid requirements
necessary for registration.
✔✔Ways herbicides are classified (3) - ✔✔1. Absorption characteristics
2. The plant processes that they affect
3. Selectivity
✔✔Contact herbicides are generally most effective on __________ _________ plants -
✔✔annual herbaceous
✔✔Plant processes affected by herbicidal activity (5) - ✔✔1. Cell division
2. Tissue development
3. Photosynthesis
4. Respiration
5. Nitrogen Metabolism and Enzyme Activity
✔✔At what growing stage are herbicides that affect cell division most effective? -
✔✔Preemergence
✔✔Plant growth regulators (PGRs) affect what process of plants? - ✔✔Tissue
development
✔✔Plant death may be ______ when the photosynthesis process is disrupted. -
✔✔Slow
✔✔Physical factors that contribute to susceptibility to selective herbicides (3) - ✔✔1.
Herbicide placement
2. Formulation
3. Rate of applicaiton
, ✔✔Biological factors that contribute to susceptibility to selective herbicides (3) - ✔✔1.
Physiological factors
2. Morphological factors
3. Stage of plant growth
✔✔At what point in the growth cycle are foliar-active herbicides the most effective for
perennial plants? - ✔✔Late and postflowering periods (when perennial plants are
translocating materials downwards towards the roots)
✔✔Low temperature affects herbicide efficiency by - ✔✔slowing growth, and therefor
slowing absorption
✔✔Methods used when managing aquatic weeds in flowing water (4) - ✔✔1. Trailing
hoses to aid the sinking of herbicides
2. Special herbicide formulations, such as slow-release pellets
3. Rapidly absorbed herbicides
4. Increased contact time via sequential applications or injection equipment
✔✔Particles suspended in the water affect the water's ability to transmit light. This is
known as what quality of the water? - ✔✔Turbidity
✔✔Aquatic pesticides are known to last a long time and accumulate in organisms. True
or False? - ✔✔False
✔✔What is the most common reason for herbicide-related fish kills? - ✔✔Lowering of
dissolved oxygen
✔✔How can the lowering of dissolved oxygen be limited? - ✔✔By limiting the amount of
vegetation killed off
✔✔The danger of fish kills is less in ______ water because it can hold more oxygen
than _____ water - ✔✔cooler, warm
✔✔Do not treat more than ______-_______% of the surface area of a body of water at
any given time - ✔✔30,50
✔✔How long should one wait if more than 50% of a lake area needs to be treated? -
✔✔2-3 weeks after the initial application
✔✔Ways pesticides break down when not absorbed by pest (4) - ✔✔1. Microbial action
2. Chemical
3. Photochemical
4. Adsorption (binding) to soil particles
