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When treating weeds and algae, why do I have to treat in sections? | Ponds & Lakes Q&A

Q: When treating weeds and algae, why do I have to treat in sections?

Q: When treating weeds and algae, why do I have to treat in sections?

Zahn- Cedar Rapids, IA

A: It’s all about the fish. Though it’s an inconvenience to you, treating your lake or pond’s weeds and algae in sections is critical for the health of your underwater inhabitants. Those herbicides and algaecides deplete the oxygen in the pond, creating a stressful environment for the fish. Partitioning the treatments keeps oxygen levels safe while minimizing the stress.

When combating weeds and algae in the summertime, remember these three things:

  • Warm Weather = Less Oxygen: In the hot summer months, the water column will naturally hold less oxygen as it warms up.
  • Chemical Treatments = Less Oxygen: When you treat the weeds and algae with Shoreline Defense® or Algae Defense®, the oxygen levels will decline in your pond.
  • Decaying Matter = Less Oxygen:As the herbicide and algaecide start to work, the decaying matter will begin to be consumed by microorganisms, which use up the oxygen in the water.

All of these things create a stressful situation for your fish. When that happens, their immune systems could suffer, and they could develop and succumb to disease – which is something you don’t want to happen.

So while treating your pond or lake, break it into quarter sections. Then treat one section and wait 10 to 14 days to allow the water time to rebalance its oxygen level before treating the next section. Some other things you can do to improve the oxygen levels in your pond:

  • Add Aeration: Aeration, like the Pond Series™ Aeration Systems, adds oxygen to the water below the surface. The oxygen is utilized by the fish as well as the beneficial bacteria and microorganisms, which break down the muck and detritus that feed the algae and weeds.
  • Rake Away the Debris: As the herbicide and algaecide go to work killing the pond pests, take time to rake out the dead debris before it becomes algae- and weed-feeding pond muck. The Pond & Beach Rake makes the chore quick and easy.

Pond Talk: What kinds of spring and summer maintenance chores have you been doing so far this year?

Create the Perfect Pond - Airmax(r) Pond Series(t) Aeration Systems

Why can’t I treat my pond with the common weed killer I use around my yard? | Ponds & Lakes Q&A

Why can’t I treat my pond with the common weed killer I use around my yard?

Q: Why can’t I treat my pond with the common weed killer I use around my yard?

Duane – Spring Grove, PA

A: It may seem like a convenience and a cost savings to use your terrestrial weed herbicides to treat weeds in your pond or lake. But when it comes to managing nuisance growth in and around your pond, not all chemicals are created equally.

Though broad-spectrum-use herbicides like diuron work great on grassy terrestrial weeds, they’re not approved for use on cattails and water milfoil because of the direct contact with public waterways or possibility of leaching into drinking/ground water. Instead, you need to use products that are registered by the Environmental Protection Agency for aquatic use, like Pond Logic® Algae Defense®, PondWeed Defense® and Avocet® PLX aquatic herbicides.

Why the regulations? Read on for details.

Environmental Protection

The EPA registers products like herbicides for aquatic use to protect the environment. Its goal is to minimize harm while maximizing results.

The government agency tests the ingredients’ concentration, frequency of use and effectiveness for their short-term and long-term effects in their intended environment. It also checks the chemicals’ half life, which is how long the substances remain in the environment before breaking down enough to be considered non-toxic.

Safer for Your Pond Visitors

If you use unapproved chemicals in your pond or lake, you could be doing harm to not only the ecosystem but also to your fish, your livestock and wildlife, your soil and, most importantly, to yourself, your family and your neighbors.

Herbicides that have been approved by the EPA include specific restrictions and precautions on their labels about consuming fish after treating bodies of water. They caution against swimming in or drinking from treated ponds within a certain amount of time after application. They even warn of soil contamination issues that landowners or pond professionals should be aware of.

Chemicals that are not approved for aquatic use have none of these warnings because they have not been tested for their effects on the pond habitat. In fact, some products can actually be considered a contaminant to the aquatic environment – and you don’t want that, right?

Obey the EPA

Even if you don’t consume your game fish, swim in your lake or drink the water, you should steer clear of unapproved chemicals. Some of them can leach into the soil surrounding the pond or be released during heavy rains when ponds flood. That runoff – including the potentially toxic chemicals – can then be released into the public waterways or wetlands used by neighbors.

Play it safe. Obey the EPA.

Pond Talk: What do you think of the EPA’s regulation of aquatic herbicides?

Pond Logic PondWeed Defense - Eliminate Aquatic Weeds

What Can I Do To Reduce Or Remove Cattails From My Pond? | Ponds & Lakes Q&A

Q: What can I do to reduce or remove cattails from my pond?

Ryan – Bradford, PA

A: Cattails, when left unchecked, can proliferate and take over a pond or lake in no time. These common aquatic plants grow from 3 to 10 feet tall in dense colonies around the margins of ponds and lakes. In the spring, the green strap-like foliage grows from large, creeping, below-the-ground rhizomes. As the seasons progress, the cattail’s leaves and spikes – or the plant’s brown cylindrical flower – grow. And when the flowers open and let loose their cottony seeds, the cattails spread and propagate new plants throughout the lake.

Cattails can indeed be a nuisance. Granted, a small, managed area of cattails will provide an ideal habitat for amphibians, insects, birds and fish, as well as helping to prevent erosion. But too many of these plants can create an unappealing look and begin to transform a healthy lake or pond into marshland.

Controlling cattails involves a simple three-step process: You’ll need to spray an herbicide to kill the plants themselves, cut the leaves and spikes down and remove them, and retreat as necessary.

Step 1: Treat the Plants

The most common way to control cattails is to apply an EPA-registered herbicide and surfactant product, like Avocet PLX, using a pressurized pond sprayer, such as the Airmax® Pond Sprayer. Read the product labels for proper dosage rates for your size lake. To treat a 2,500-square-foot area of weeds, mix 8 ounces of Avocet PLX with 1 gallon of water, pour into pond sprayer and apply onto actively growing plants and at least 18 inches above the water surface where the cattails are growing. Allow the mixture to absorb into the plant and the root system, which is the most difficult part of the plant to kill, for one to two weeks.

Step 2: Cut, Remove the Stalks

Once the herbicide has had a chance to soak into the cattail’s root system, the plant will turn brown and become limp. At this point, you should remove the stalks. Doing so prevents muck accumulation, and it also makes it easier to treat and remove new cattails in the future as they will come up between the dead stalks. Cut the stalks using the Airmax® Pond Rake and Cutter Combo or the Jenlis WeedRazer® Pro Aquatic Weed Cutter at the base of the plants, allowing for easier removal with your rake.

Step 3: Retreat as Needed

To completely eradicate cattails in a pond, this process may need to be repeated – and repeated and repeated because not all cattail roots will be killed by one treatment. But once you have the plants under control, they can make a nice addition to your landscape and encourage wildlife to call your pond or lake home. Just don’t let the cattails take over again!

Pond Talk: How large of an area do you have in your lake or pond that’s devoted to cattails?

Avocet PLX - Eliminate Cattails & Phragmites

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