Diquat Water Weed and Landscape Herbicide would be a good option to use.
Diquat is a great herbicide and can be used in landscape areas in addition to its primary use of aquatic weeds in ponds/lakes, however you would need to be careful when you spray it as it would be a non selective and could harm the desirable plants around it. Using a pre emergent like Snapshot or Surflan in spring and fall to prevent weeds from coming up in landscaping and flower beds is the best option. For broadleaf weeds coming up in a flower bed you could use anything like Diquat or Roundup to spot treat, and for grassy weeds a product like Grass Out Max can actually be sprayed over the top of most flowers, ornamentals and vegetables to rid the areas of unwanted grasses.
Diquat is a fast-acting aquatic & landscape herbicide that kills both weeds and grasses. It will kill those sprayed.
Diquat Water Weed and Landscape Herbicide is one of our top products for control of Cattails as well as a multitude of other aquatic weeds. It is not harmful to any aquatic life and will control the weeds in the water as well as along the bank.
For Cattails,
Diquat Water Weed and Landscape Herbicide is safe for ponds with fish when used as directed on the product label. Per the product label: "Treatment of dense weed areas may result in oxygen loss from decomposition of dead weeds. This loss of oxygen may cause fish suffocation. Therefore, treat only 1/3 to 1/2 of the water body area at one time and wait 14 days between treatments." We do not carry an algaecide or any other products that are safe to be used in specifically koi ponds at this time.
Per the product label Diquat Water Weed and Landscape Herbicide can be used at a rate of .5-2.0 gallons per surface acre in a sufficient carrier along with 16-32 oz per acre of a surfactant for pennywort. Retreat as necessary for densely populated weed areas. If you are using it as a spot treatment, you would use approximately .75 oz per gallon of water plus a surfactant. Spray to completely wet target weeds but not to the point of runoff. Densely packed weeds or mats may require additional applications due to incomplete spray coverage. Repeat as needed. For best results, re-treat weed scapes within 2 weeks of the initial treatment.
Diquat Water Weed and Landscape Herbicide should be applied at a rate of 1 to 2 gallons per surface area of water. For a 1 acre lake or pond - spray 1 to 2 gallons of Diquat into the lake. If using a hand sprayer, for example, 2 gallon sprayer, put 1 gallon of water and 1 gallon of Diquat into the sprayer and spray the contents over an acre of the area. Per the product label, it should be applied in the spring or early summer when the weeds are actively growing and when water temperatures have reached or exceeded 50 degrees.Please see the label for complete application instructions.
Diquat Water Weed and Landscape Herbicide should be applied at a rate of 1 to 2 gallons per surface area of water. For a 1 acre lake or pond - spray 1 to 2 gallons of Diquat into the lake. If using a hand sprayer, for example, 2 gallon sprayer, put 1 gallon of water and 1 gallon of Diquat into the sprayer and spray the contents over an acre of the area. Per the product label, it should be applied in the spring or early summer when the weeds are actively growing and when water temperatures have reached or exceeded 50 degrees.
Diquat Water Weed and Landscape Herbicide is considered rainfast after the treated area has dried.
We suggest using Diquat Water Weed and Landscape Herbicide for water willow. Please see the product label for specific rates and application instructions.
You want to use .75 fl ounces of Diquat Water Weed and Landscape Herbicide per one gallon of water to spot treat for duckweed. Be sure to mix in a surfactant like Non Ionic Surfactant, to help the product to stick.
We recommend waiting about 2 weeks after applying Diquat Water Weed and Landscape Herbicide so that the treated plants have time to die before you prepare the soil for seeding
Diquat Water Weed and Landscape Herbicide should be applied first and then the Crystal Blue Pond Cleaner to clear dead vegetation and muck/scum. We are not aware of a product that contains bond cleaner and weed eradication.
We do not carry an algaecide or any other products that are safe to be used in koi ponds at this time. We would recommend that you contact a koi pond supplier in your area or possibly your local cooperative extension office for advice on what products to use.
Yes, Diquat Water Weed and Landscape Herbicide is labeled for Eurasian Milfoil. For best results, re-treat as necessary on 14-21 day intervals.
Diquat Water Weed and Landscape Herbicide should be used with a surfactant, such as the Non-Ionic Surfactant. The ratio for that product is 1-2 teaspoons per gallon of water. The Diquat can be used as as a broadcast application or a spot spray. It is labeled for various broadleaf weed and could potentially kill them if the product drifts.
Diquat Water Weed and Landscape Herbicide will kill both duckweed and lily plants. You would need to spot treat the duckweed carefully, avoiding the lotus and lily plants. Removing them, if you can, would be the best option to avoid injury.
Diquat Water Weed and Landscape Herbicide should be tank mixed with water and a non-ionic surfactant and sprayed into the pond as a broadcast application (for widespread weeds) or a spot spray (for sporadic weeds). Please refer to the product label for complete instructions.