pond weeds

What type of herbicide can be used for pondweeds?

There are several choices in weed control for lakes Florida; one standard solution is the use of herbicides. Herbicides can kill pondweeds, but which one is best? Again, several choices include 2,4-D, Carfentrazone-ethyl, and Fluridone. First, read the labels carefully and apply the herbicide according to the instructions. Next, treat half of your pond at a time. If you notice any dead algae, remove them immediately. Natural microbes will break them down and won’t harm your pond’s water quality.


While the primary use of 2,4-D herbicide for ponds is to control invasive species like Eurasian watermilfoil, this chemical may also harm some native species. These species include native milfoils and naiads, bladderwort species, and coontail. However, its use is not recommended in cultivated ponds because it will harm the water’s dissolved oxygen levels.

It is essential to check the label of any herbicide you plan to use in a pond. Some herbicides are applied by volume, while others are based on the area treated. Incorrect calculations can result in harmful results. An herbicide label will tell you how much active ingredient it contains in a formulated product. This amount also includes inert ingredients.

You should not use the chemical around small mammals and dogs. While it does not cause toxicity in humans, it can kill aquatic animals, particularly bees. When using 2,4-D, it is recommended to use a hose, which can be used to spray large areas. However, monitor the water and fish for at least a week after treatment. Also, keep emergency aeration equipment close by if any fish start acting stressed.


If you want to get rid of pondweeds quickly, you can choose a systemic liquid herbicide like sulfentrazone-ethyl. Carfentrazone is a fast-acting herbicide that kills many emergents and floating aquatic plants. Because of its fast-acting action, this herbicide can be used effectively with other systemic herbicides like chlorpyrifos and diketopiperazine. However, sulfentrazone is not very good for fish because of its moderate toxicity to aquatic life.

Before choosing the suitable herbicide for your pond, you must know the type of weeds. This will determine the herbicide formulation and the appropriate amount. It is essential to consider the depth of the water, the type of plants, and the size of the area. A good time for herbicide application is late spring or early summer. The dosage depends on the number of plants and the size of the area to be treated. If you use a pond herbicide in the winter, it will be ineffective, and you might want to change the dosage to get rid of the weeds.

This systemic liquid herbicide has many benefits. It is effective against submerged and floating plants, including hydrilla. This herbicide is expensive and needs between $500 and 800 dollars to treat an acre of four-foot-deep water. Because it is systemic and long-acting, it can be applied to exposed sediment. Penoxsulam needs to be in contact with the target plant for 60 to 120 days before it can be used again. Dilution can affect its toxicity, so it should only be used when the residue is below one ppb.


The Fluridone herbicide effectively treats various aquatic plants, including curly-leaf pondweed and southern naiad. This herbicide is available in concentrations from 15 to 75 parts per billion and is applied to the marine environment by backpack spray or aerial application. The treatment can take 45 to 90 days to kill the target plant entirely. The product is rated for use in stagnant and low-flow environments.

Fluridone is a systemic herbicide, meaning it moves slowly from submerged foliage to the roots of aquatic plants. Therefore, its toxicity depends on the absorption rate by aquatic vascular plants. However, several studies have shown that Fluridone is highly effective at controlling pond weeds. Therefore, using it correctly is an essential aspect of controlling pond weeds.

Airmax WipeOut, an easy-to-use weed killer, is effective against both floating and submerged pond weeds. It comes in four-ounce, eight-ounce, and 32-ounce sprays. For a practical application, you will need a one-gallon mixing container. Itwill kill most pond weeds by interfering with their photosynthesis. However, you should note that the weed-killing action of this product is temporary and may interfere with irrigation for up to 30 days.