• Archives

  • Categories

  • Pages

  • Follow me on Twitter

I thought I did a successful chemical treatment, but why are the weeds coming back? | Ponds & Lakes Q&A

Q: I thought I did a successful chemical treatment, but why are the weeds coming back?

Q: I thought I did a successful chemical treatment, but why are the weeds coming back?

Barney – Andalusia, AL

A: Treating weeds is a tricky task. Despite dosing them with aquatic herbicides to clear your pond or lake of plant pests, they seem to grow back over and over again. It seems like a never-ending cycle! Why does this happen?

Well, chemical treatments have their benefits and drawbacks: On one hand, they work great as a quick fix to decimate actively growing weeds. But once those plants die, they become a food source for future weeds and algae, acting as a fertilizer for the very things you’re trying to get rid of. The herbicides do nothing to prevent future growth, and so you’re left with yet another growth spurt of pond weeds, which you’ll then treat with chemical herbicides – and around you’ll go again.

So how do you break the cycle? Here is a four-step approach that will help put an end to it.

  1. Remove the Dead Weeds: Once the weeds have browned, use a Pond & Beach Rake or PondSkim™ Debris Skimmer to remove as much dead material from the water as possible. This prevents dead plant material and muck from accumulating and fertilizing future weed growth.
  2. Be Proactive: Debris will still find its way into your pond, so add some beneficial bacteria to the water to manage the excess nutrients before they feed your weeds. The products found in the ClearPAC® PLUS Pond Care Packages – including PondClear™ and EcoBoost™ for suspended debris, and MuckAway™ for accumulated bottom-of-the-pond debris – naturally break down that organic material.
  3. Add Aeration: If you don’t have one already, install a Airmax® Aeration System that’s sized for your pond or lake. By circulating and adding oxygen to the water column, the beneficial bacteria will thrive. In turn, they’ll eat through even more debris and prevent weed and algae growth.
  4. Shade and Color:  Pond Dye is another offensive tactic in your battle against aquatic weeds. Pond dye shades the water, preventing ultraviolet light from reaching the plants.

Throughout the spring and summer, weeds will grow. But with some pond management practices, you can keep those pesky plants to a minimum.

Pond Talk: How often do you treat your pond or lake for weeds?

Skim Dead Algae & Vegetation - The Pond Guy(r) Pond & Beach Rake

 

Enjoy this article?
Join over 50,000 fellow pond owners and receive our Weekly Pond Talk every Saturday.

 

How can I control the duckweed in my pond? | Ponds & Lakes Q&A

Q: How can I control the duckweed in my pond?

Q: How can I control the duckweed in my pond?

Kyle – Burke, KY

A: Duckweed is a tiny menace that definitely needs to be managed. Brought to your pond or lake by humans and their equipment or on the feet and feathers of visiting waterfowl, dense colonies of these plants can proliferate and eventually cover the water surface. It’s not something you want in growing your pond.

Duckweed or Watermeal?

Duckweed a very small, light green, free-floating plant with a single hair-like root and three 1/16- to 1/8-inch long leaves, or fronds. It tends to grow in dense colonies in quiet water that’s undisturbed by waves. You can fit six to eight of these plants of the tip of your finger.

Watermeal – another invasive plant that can be mistaken for duckweed – is also light green and free-floating, but it has no roots and is more of a grainy, seed-type plant. It’s also much smaller than duckweed; at less than 1 millimeter in size, you can fit 10 to 20 of them on the tip of your finger.

Duckweed and watermeal colonies can provide a habitat for microscopic critters and forage for hungry ducks, but the plants can reduce oxygen in the water if they grow to cover a lake’s or pond’s surface. That could compromise your fishes’ health and cut off sunlight to underwater plants.

Treat Effectively

To control duckweed, think short-term and long-term.

Short Term: Ultra PondWeed Defense® or Clipper™ used with Treatment Booster™ PLUS are your go-to herbicide products for short-term control of duckweed and other invasive aquatic weeds. They provide broad-spectrum pond weed control in slow-moving water and kill what’s actively growing in your pond. If duckweed hasn’t completely taken over your water surface, you may notice algae growth mixed in with the weeds – in which case you’ll need to treat the algae first. (Pro tip: Clipper™ will control both algae and duckweed.)

Long Term: For long-term control, you’ll need an herbicide like fluridone, which is found in Sonar™ A.S. When applied in early spring (or when you begin to notice weed growth), you’ll see the product controlling established plants in 30 to 60 days, and in 90 days, you’ll have full pond protection. Because exposure to sunlight can reduce Sonar’s effectiveness, use in combination with Pond Dye. If you use your pond water to irrigate, you will need to wait 30 days following treatment.

Improve Overall Pond Health

In addition to managing your menace with herbicides, you should also reduce muck and aerate the water to keep your overall pond healthy. The products in the ClearPAC® PLUS Pond Care Package – including PondClear™, MuckAway™ and EcoBoost™ – will help reduce the submerged and suspended organic debris. Combine that with some Airmax® Aeration, and your water will stay crystal clear all season long.

Pond Talk: What else do you do to control duckweed in your lake?

Treats Floating & Submerged Weeds - Valent® Clipper™ Aquatic Herbicide

How can I control the duckweed in my pond? | Ponds & Lakes Q&A

Q: How can I control the duckweed in my pond?

Q: How can I control the duckweed in my pond?

Kyle – Burke, KY

A: Duckweed is a tiny menace that definitely needs to be managed. Brought to your pond or lake by humans and their equipment or on the feet and feathers of visiting waterfowl, dense colonies of these plants can proliferate and eventually cover the water surface. It’s not something you want in growing your pond.

Duckweed or Watermeal?

Duckweed a very small, light green, free-floating plant with a single hair-like root and three 1/16- to 1/8-inch long leaves, or fronds. It tends to grow in dense colonies in quiet water that’s undisturbed by waves. You can fit six to eight of these plants of the tip of your finger.

Watermeal – another invasive plant that can be mistaken for duckweed – is also light green and free-floating, but it has no roots and is more of a grainy, seed-type plant. It’s also much smaller than duckweed; at less than 1 millimeter in size, you can fit 10 to 20 of them on the tip of your finger.

Duckweed and watermeal colonies can provide a habitat for microscopic critters and forage for hungry ducks, but the plants can reduce oxygen in the water if they grow to cover a lake’s or pond’s surface. That could compromise your fishes’ health and cut off sunlight to underwater plants.

Treat Effectively

To control duckweed, think short-term and long-term.

Short Term: Ultra PondWeed Defense® or Clipper™ used with Treatment Booster™ PLUS are your go-to herbicide products for short-term control of duckweed and other invasive aquatic weeds. They provide broad-spectrum pond weed control in slow-moving water and kill what’s actively growing in your pond. If duckweed hasn’t completely taken over your water surface, you may notice algae growth mixed in with the weeds – in which case you’ll need to treat the algae first. (Pro tip: Clipper™ will control both algae and duckweed.)

Long Term: For long-term control, you’ll need an herbicide like fluridone, which is found in Sonar™ A.S. When applied in early spring (or when you begin to notice weed growth), you’ll see the product controlling established plants in 30 to 60 days, and in 90 days, you’ll have full pond protection. Because exposure to sunlight can reduce Sonar’s effectiveness, use in combination with Pond Dye. If you use your pond water to irrigate, you will need to wait 30 days following treatment.

Improve Overall Pond Health

In addition to managing your menace with herbicides, you should also reduce muck and aerate the water to keep your overall pond healthy. The products in the ClearPAC® PLUS Pond Care Package – including PondClear™, MuckAway™ and EcoBoost™ – will help reduce the submerged and suspended organic debris. Combine that with some Airmax® Aeration, and your water will stay crystal clear all season long.

Pond Talk: What else do you do to control duckweed in your lake?

Treats Floating & Submerged Weeds - Valent® Clipper™ Aquatic Herbicide

I thought I did a successful chemical treatment, but why are the weeds coming back? | Ponds & Lakes Q&A

Q: I thought I did a successful chemical treatment, but why are the weeds coming back?

Q: I thought I did a successful chemical treatment, but why are the weeds coming back?

Barney – Andalusia, AL

A: Treating weeds is a tricky task. Despite dosing them with aquatic herbicides to clear your pond or lake of plant pests, they seem to grow back over and over again. It seems like a never-ending cycle!

Why does this happen?

Well, chemical treatments have their benefits and drawbacks: On one hand, they work great as a quick fix to decimate actively growing weeds. But once those plants die, they become a food source for future weeds and algae, acting as a fertilizer for the very things you’re trying to get rid of. The herbicides do nothing to prevent future growth, and so you’re left with yet another growth spurt of pond weeds, which you’ll then treat with chemical herbicides – and around you’ll go again.

So how do you break the cycle? Here’s a four-step approach that will help put an end to it.

  1. Remove the Dead Weeds: Once the weeds have browned, use a Pond & Beach Rake or PondSkim™ Debris Skimmer to remove as much dead material from the water as possible. This prevents dead plant material and muck from accumulating and fertilizing future weed growth.
  2. Be Proactive: Debris will still find its way into your pond, so add some beneficial bacteria to the water to manage the excess nutrients before they feed your weeds. The products found in the ClearPAC® PLUS Pond Care Packages – including PondClear™ and EcoBoost™ for suspended debris, and MuckAway™ for accumulated bottom-of-the-pond debris – naturally break down that organic material.
  3. Add Aeration: If you don’t have one already, install a Airmax® Pond Series™ Aeration System that’s sized for your pond or lake. By circulating and adding oxygen to the water column, the beneficial bacteria will thrive. In turn, they’ll eat through even more debris and prevent weed and algae growth.
  4. Shade and Color: Also found in the ClearPAC® Plus package is Pond Dye, another offensive tactic in your battle against aquatic weeds. Pond dye shades the water blue or black, preventing ultraviolet light from reaching the plants.

Throughout the spring and summer, weeds will grow. But with some pond management practices, you can keep those pesky plants to a minimum.

Pond Talk: How often do you treat your pond or lake for weeds?

Remove Floating Debris Quickly - The Pond Guy(r) PondSkim(t) Debris Skimmer

I had a bad duckweed problem last year. How do I prevent it this year? | Ponds & Lakes Q&A

Q: I had a bad duckweed problem last year. How do I prevent it this year?

Q: I had a bad duckweed problem last year. How do I prevent it this year?

Alex – Alvada,OH

A: As you know, Duckweed is a persistent pond pest. Dense colonies of these prolific plants can completely cover the surface of a lake or fish pond, causing dissolved oxygen depletions and fish kills. These tiny invaders need to be managed before they take over.

ID Duckweed

Transported by waterfowl, Duckweed is a very small, light green, free-floating plant that sports a single hair-like root and three 1/16- to 1/8-inch long leaves, or fronds, that resemble a four-leaf clover. It tends to grow in dense colonies in quiet water that’s undisturbed by waves, and it’s often mistaken for algae.

Though Duckweed colonies can provide a habitat for microscopic critters and forage for hungry ducks, the plant can wipe out oxygen in the water if it grows to cover a lake’s or pond’s surface. That could compromise your fishes’ health and cut off sunlight to underwater plants.

Plant Pest Control

Because Duckweed is such a small plant that spreads very quickly, it can be difficult to control – and so it’s critical to treat your pond or lake early in the spring when the growth first appears.

To manage these aquatic bad guys, you’ll need an herbicide. We recommend Sonar A.S., a weed killer that provides season-long control against unwanted plants like Duckweed. It’s designed for water bodies that have no water outflow, as it can take 30 to 60 days to control established weed growth and up to 90 days for full protection of your pond.

Sonar A.S. degrades quickly in sunlight, and so you must add Pond Dye at the time of treatment. The dye will shade the water and allow the herbicide to work effectively.

Short-Term Solution

If you want to remove the Duckweed for a short period of time but your pond or lake has an outflow that prevents you from using Sonar A.S., you can remove the tiny plants with the Pond Skim. The floating tool, which is 5 feet wide, collects surface debris when dragged across the water.

Pond Talk: How do you remove duckweed from your farm pond or lake?

One Treatment for the Entire Season - Sonar™ Fluridone Aquatic Herbicide

I’ve heard a lot about Clipper Herbicide. What does it do? | Ponds & Lakes Q&A

Q: I’ve heard a lot about Clipper Herbicide. What does it do?

Eldon – Urbandale, IA

A: Clipper™ Aquatic Herbicide controls a wide variety of algae, floating weeds and submerged weeds, but its claim to fame is its ability to wipe out troublesome watermeal and duckweed—two aquatic weeds that can be difficult to manage in any pond or lake. In fact, when used as directed, up to 80 percent of duckweed and watermeal will be eliminated within the first application of Clipper™. Not too shabby!

Here are some tips for use:

  • Check your pH first: High pH levels will reduce Clipper’s™ effectiveness, so test the pH of your pond’s water with a pH Test Kit before using the herbicide. Apply it only when the pH is 8.5 and below.
  • Apply on a sunny morning: The herbicide is a reactive treatment that works better in the sunlight, so treat your pond or lake early in the morning on a sunny day. Hold off on adding light-blocking Pond Dye to your water, until after Clipper™ has had a chance to go to work on the weeds.
  • Spray and play: Applying Clipper™ to aquatic weeds is easy. Simply mix the amount of Clipper™ and water in a Specialty Pond Sprayer according to label instructions, and spray onto floating weeds and algae or place the tip beneath the water’s surface to treat submerged weeds. Over time, the weeds will begin to brown and die.
  • A little goes a long way: You only need to use 1 pound of Clipper™ per surface acre one to two times per year. Because it’s a contact herbicide, complete coverage is essential for effective control. You can reapply Clipper™ after 28 days if you find that you’ve missed some weed patches after the first treatment.
  • No temperature restrictions: Clipper™ can be used year-round in any temperature, but it should be applied only when the weeds are actively growing.
  • Rake away the debris: Once the aquatic weeds are completely dead, use a rake—like the Pond & Beach Rake – to remove the debris. This will prevent the foliage from accumulation and turning into algae-feeding muck.

Clipper™ Aquatic Herbicide can be used in a range of waterways, including bayous, canals, drainage ditches, lakes, marshes, freshwater ponds and reservoirs. It quickly and effectively controls watermeal, duckweed, water lettuce, giant salvinia, cabomba, Eurasian watermilfoil, hydrilla and curlyleaf pondweed. If you fight aquatic weeds in your lake or pond, consider using Clipper™. It’s good stuff!

Pond Talk: Have you tried Clipper™ in your pond or lake? If so, tell us how it worked for you.

Valent® Clipper™ Aquatic Herbicide - Control Tough Invasive Weeds & Algae

I think I have duckweed or watermeal. How do I know? And how do I treat it? | Ponds & Lakes Q&A

Q: I think I have duckweed or watermeal. How do I know? And how do I treat it?

Q: I think I have duckweed or watermeal. How do I know? And how do I treat it?

Richard – Fishers, IN

A: Duckweed and watermeal are both pond pests. Dense colonies of these prolific plants can completely cover the surface of a lake or fish pond, causing dissolved oxygen depletions and fish kills. These tiny invaders need to be managed before they take over.

But before you control them, you need to get to know them. Let’s meet these troublemakers.

Watermeal

The smallest seed-bearing plants in the world, watermeal is a very tiny (less than 1 millimeter) light green free-floating rootless plant that resembles green cornmeal. They prefer quiet water that’s undisturbed by waves, and they’re often associated with colonies of duckweed and mosquito fern (azzola). Unchecked, these plants can be aggressive invaders.

Duckweed

Duckweed is another very small light green free-floating plant, but unlike watermeal, duckweed has a single root and one to three leaves, or fronds, that measure 1/16- to 1/8-inch long. Like watermeal, duckweed tends to grow in dense colonies in quiet water that’s undisturbed by wave action. Duckweed colonies provide habitat for micro invertebrates, but if it completely covers the surface of a pond for an extended period, it will cause oxygen depletions. As its name implies, duckweed is often gobbled by ducks, which also transport it to other bodies of water but you cannot count them for keeping the weed in control.

Stop the Invasion!

To control these aquatic bad guys, you’ll need a herbicide. Clipper™ and Ultra PondWeed Defense® are both selective plant killers that will attack watermeal and duckweed. They’re a short-term solution for both—be sure to apply as directed.

For long-term control of duckweed, you’ll need something a bit stronger. We recommend Sonar™ A.S.. It’s formulated to control stubborn aquatic weeds all season long. Don’t forget to add pond dye, it protects the Sonar™ A.S. from being quickly degraded by the sun.

Pond Talk: Tell us about your experiences with duckweed and watermeal. Do you have any additional management tips to share?

Deliver Fast & Selective Control Of Weeds - Valent® Clipper™ Aquatic Herbicide