MDARD COMMERCIAL PESTICIDE
APPLICATOR EXAM: AQUATIC PEST
MANAGEMENT (CATEGORY 5)
EXAM / MDARD COMMERCIAL PESTICIDE
APPLICATOR EXAM: AQUATIC PEST
MANAGEMENT (CATEGORY 5)
EXAM PREPARATION 2025/2026 WITH
ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|FREQUENTLY TESTED QUESTIONS AND
SOLUTIONS|ALREADY GRADED
A+|NEWEST|BRAND NEW
VERSION!!|GUARANTEED PASS
The three major objectives of preventative aquatic weed control
1. Prevention of weed spread
2. Elimination of nutrient sources
3. Deepening or increasing the slope of shallow waters where plants can grow
List 5 of the 8 methods for reducing nutrient and other contaminating inflows to water sources
1. Plant vegetation along drainage areas
2. Leave a 20-foot buffer for fertilization
3. Prevent livestock from entering the water
4. Practice conservation tillage to prevent erosion
5. Construct a settling pond to receive nutrients before the flow reaches the main body of water
6. Avoid adding fertilizers
7. Check for hidden sources of nutrients
1|Page
,8. Plant deciduous trees far enough from water bodies so leaves will not fall into the water and
accumulate
Plants susceptible to drawdown (3)
1. Large leaf pondweed
2. Waterlily
3. Watershield
Plants moderately tolerant to drawdown (3)
1. Leafy pondweed
2. Richardson's pondweed
3. Water smartweed
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)
2|Page
, 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
3|Page
APPLICATOR EXAM: AQUATIC PEST
MANAGEMENT (CATEGORY 5)
EXAM / MDARD COMMERCIAL PESTICIDE
APPLICATOR EXAM: AQUATIC PEST
MANAGEMENT (CATEGORY 5)
EXAM PREPARATION 2025/2026 WITH
ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS
|FREQUENTLY TESTED QUESTIONS AND
SOLUTIONS|ALREADY GRADED
A+|NEWEST|BRAND NEW
VERSION!!|GUARANTEED PASS
The three major objectives of preventative aquatic weed control
1. Prevention of weed spread
2. Elimination of nutrient sources
3. Deepening or increasing the slope of shallow waters where plants can grow
List 5 of the 8 methods for reducing nutrient and other contaminating inflows to water sources
1. Plant vegetation along drainage areas
2. Leave a 20-foot buffer for fertilization
3. Prevent livestock from entering the water
4. Practice conservation tillage to prevent erosion
5. Construct a settling pond to receive nutrients before the flow reaches the main body of water
6. Avoid adding fertilizers
7. Check for hidden sources of nutrients
1|Page
,8. Plant deciduous trees far enough from water bodies so leaves will not fall into the water and
accumulate
Plants susceptible to drawdown (3)
1. Large leaf pondweed
2. Waterlily
3. Watershield
Plants moderately tolerant to drawdown (3)
1. Leafy pondweed
2. Richardson's pondweed
3. Water smartweed
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)
2|Page
, 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
3|Page
