Diquat Water Weed and Landscape Herbicide

Which of the following submerged weeds is NOT listed as a target pest for this product?

• Hydrilla
• Richardson's pondweed ✓
• Coontail
• Brazilian Elodea

Answer: The label explicitly states that DIQUAT WATER WEED & LANDSCAPE HERBICIDE does not control Richardson's pondweed, P. richardsonii.

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For an aerial application targeting waterlettuce and waterhyacinth, what is the required dilution range of water?

• 10 to 24 gals. of water ✓
• 75 to 200 gals. of water
• 5 to 10 gals. of water
• 50 to 100 gals. of water

Answer: The mixing instructions for aerial application of waterlettuce and waterhyacinth specify 10 to 24 gals. of water.

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When performing a surface spray for salvinia, waterlettuce, and waterhyacinth, what must be added to the labeled rate of herbicide per acre?

• A 75% or greater non-ionic surfactant ✓
• A 50% or greater non-ionic surfactant
• A 25% or greater non-ionic surfactant
• A 10% or greater non-ionic surfactant

Answer: The mixing instructions for surface sprays require the labeled rate of a 75% or greater non-ionic surfactant per acre.

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What is the recommended application method for dense submersed weeds or water over 2 feet deep?

• Surface spray
• Aerial application
• Subsurface application ✓
• Manual removal

Answer: The label states that for dense submersed weeds or water over 2 feet deep, a surface spray is not recommended and the product should be applied subsurface.

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How might water temperatures below 50°F-60°F affect the product's performance?

• Efficacy and immediacy of results may be reduced ✓
• The product will become highly toxic to fish
• The product will require double the application rate
• The product will only work on surface weeds

Answer: The timing/weather section notes that at water temperatures below 50°F-60°F, efficacy and immediacy of results may be reduced.

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If a technician is treating a severe infestation of submerged weeds in water that is 4 feet deep, what is the appropriate rate per surface acre?

• 2.0 gallons ✓
• 1.0 gallon
• 0.5 gallons
• 4.0 gallons

Answer: The label specifies that for severe weed infestations, use the 2.0 gallon per surface acre rate, and specifically lists 2.0 gallons for 4 feet depth.

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To achieve best results when treating cattails, when should the application occur?

• Before flowering ✓
• After flowering
• During seed dispersal
• Only in the winter

Answer: The timing/weather section states: 'For best results, apply before flowering (cattail).'

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When applying to submerged weeds in water that is 2 feet deep or less, what is the maximum allowable rate?

• Do not exceed 1 gallon per surface acre ✓
• 0.5 gallons per surface acre
• 2.0 gallons per surface acre
• 1.5 gallons per surface acre

Answer: The restrictions state that for water depths of 2 feet or less including shorelines, do not exceed 1 gallon per surface acre.

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