Landscape & Aquatic Herbicide controls submersed, floating and emergent aquatic weeds including duckweed as well as broadleaf and grassy weeds. A surfactant is necessary when using this product with any weed on or above the water surface including landscape applications. Water use is restricted for irrigation and drinking (animal or human), see label for details. Active ingredient is 37.3% diquat dibromide. Application rate for submersed weeds varies by density between 0.125 and 0.5 gallons per acre-ft of vegetation.
AQUATIC USE DIRECTIONS
FLOATING AND MARGINAL WEEDS INCLUDING: Water lettuce (Pistia stratiotes), Waterhyacinth (Eichhornia crassipe), Duckweed (Lemna spp.), Salvinia spp. (including S. molesta),Pennywort (Hydrocotyle spp.), Frog’s Bit† (Limnobium spongia), Cattail (Typha spp.)
†Not for use in California
Harvester may be applied by backpack, airboat, spray handgun, helicopter, airplane, or similar application equipment that results in thorough spray coverage.
Spot Treatment: Apply Harvester at 2 quarts per 100 gallons spray carrier (0.5% solution) with an approved aquatic wetting agent at 0.25 - 1.0% v/v (1 quart to 1 gallon per 100 gallons water). For cattail control, Harvester should be applied prior to fl owering at the maximum application rate (8 quarts of Harvester/100 gallons spray carrier) plus the wetting agent. Repeat treatments may be necessary for complete control. Spray to completely
wet target weeds but not to runoff. Densely packed weeds or mats may require additional applications due to incomplete spray coverage. Retreat as needed. For best results, retreat weed escapes within 2 weeks of the initial treatment.
Broadcast Treatment: Apply Harvester at the rate of 0.5 - 2.0 gallons per surface-acre in suffi cient carrier along with 16 - 32 oz/A of an approved wetting agent. Retreat as necessary for densely populated weed areas. Good coverage is necessary for control of the target weeds. For duckweed control, apply Harvester at 1 - 2 gallons/A.
SUBMERSED WEEDS INCLUDING: Bladderwort (Utricularia spp.), Hydrilla (Hydrilla verticillata), Watermilfoils (including Eurasian), Myriophylum spp., Pondweeds1 (Potamogeton spp.), Coontail (Ceratophyllum demersum), Elodea (Elodea spp.), Brazilian Elodea (Egeria densa), Naiad (Najas spp.), Algae2 (Spirogyra spp. and Pithophora spp.)
1 Harvester Herbicide controls Potamogeton species except Richardson’s pondweed, P. richardsonii.
2 Suppression only. For control of Spirogyra and/or Pithophora, use Harvester in a tank-mix with an approved algaecide.
For severe weed or algae infestations, the use of an approved algaecide either as a pretreatment to the Harvester application or in a tank-mix, may result in enhanced weed control.
To control submersed weeds, apply Harvester in water at 0.5 - 2.0 gallons per surface acre (per 4 foot water depth). For severe weed infestations, use the 2.0 gallon per surface acre rate. For best results, retreat as necessary on 14 - 21 day intervals.