Marengo 2026 03 22

To achieve the most effective preemergence weed control, how should the herbicide be activated?

• By watering in with light irrigation or rainfall prior to weed germination ✓
• By applying it during a heavy thunderstorm
• By mixing it with a surfactant before application
• By applying it only to saturated soil

Answer: The label states to 'Activate MARENGO HERBICIDE by watering in with light irrigation or rainfall prior to weed germination for most effective preemergence weed control.'

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What is the recommended mixing rate for weeds using a backpack or handheld sprayer?

• 1 teaspoon per gallon of water ✓
• 1 ounce per gallon of water
• 2 teaspoons per gallon of water
• 0.5 teaspoons per gallon of water

Answer: The mixing instructions specify '1 teaspoon per gallon of water' for weeds.

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According to the label, what environmental condition can reduce the effectiveness of Marengo 2026 03 22?

• Deep cultivation ✓
• High humidity
• Extreme heat
• Low light levels

Answer: The label restrictions state that 'Deep cultivation reduces the effectiveness of MARENGO HERBICIDE.'

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In a nursery setting, what is the specific restriction regarding the timing of application to tolerant species?

• Do not apply at bud emergence or through candle stage ✓
• Do not apply during periods of heavy rainfall
• Do not apply after the first frost
• Do not apply during the peak of summer

Answer: The label explicitly states: 'Do not apply at bud emergence or through candle stage.'

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When mixing Marengo 2026 03 22 in a backpack or handheld sprayer for weeds, what is the recommended mixing order if adding glyphosate?

• Mix MARENGO HERBICIDE in first ✓
• Mix glyphosate in first
• Mix both simultaneously to ensure suspension
• Add water first, then glyphosate, then MARENGO HERBICIDE

Answer: The mixing notes state: 'If adding glyphosate, mix MARENGO HERBICIDE in first.'

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Which type of soil composition puts ornamentals at risk when using this product?

• Soil exceeding 90% sand or 20% gravel ✓
• Soil with high organic matter content
• Soil with high clay content
• Soil that is highly acidic

Answer: The label states: 'Ornamentals grown in soil exceeding 90% sand or 20% gravel may be at risk.'

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When applying Marengo 2026 03 22 around ornamentals, what is the maximum total amount allowed per acre within a 12-month period?

• 18.5 fl oz ✓
• 15.5 fl oz
• 9 fl oz
• 7.5 fl oz

Answer: The label states a subsequent application can be made within 90 days provided the total does not exceed 18.5 fl oz per acre in a 12-month period.

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Which of the following describes the correct application method for weeds around ornamentals?

• Apply as a broadcast, directed spray to the soil surface around established plants ✓
• Apply as a foliar spray directly to the leaves of established plants
• Inject directly into the root system of the plant
• Apply only to the bark of the plant stems

Answer: The label instructs to 'Apply as a broadcast, directed spray to the soil surface around established plants.'

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