Comments on: Controlling Duckweed & Watermeal – Pond & Lake Q & A – Week of June 6th http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/ Sun, 21 Mar 2010 01:06:00 +0000 http://wordpress.com/ hourly 1 By: thepondguy http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-1113 thepondguy Mon, 14 Sep 2009 16:53:18 +0000 http://thepondguy.wordpress.com/?p=111#comment-1113 Hi Cindy, <a href="http://www.thepondguy.com/product/1585/225" rel="nofollow">Whitecap</a> has the same active ingredient as Sonar, so it will kill both Duckweed and Watermeal. Watermeal is a tougher weed to control, so it will require a higher dosage rate. You can still treat for the weed this year, but it may take 30–90 days to see full results. Early Spring is the best time for the treatment, usually about 2 weeks before you would normally see the weed develop. In either case, just be sure to use the liquid product as the granular does not release fast enough to be effective. When treating by pouring or spraying, you will want to make sure the product gets underneath the floating weed for best results. Duckweed and Watermeal can produce thick mats on the surface and the chemical will just dissolve in the sun before it penetrates the weed (if the chemical is just spraying over the surface of the water). Please let us know if you have any further questions. Hi Cindy, Whitecap has the same active ingredient as Sonar, so it will kill both Duckweed and Watermeal. Watermeal is a tougher weed to control, so it will require a higher dosage rate. You can still treat for the weed this year, but it may take 30–90 days to see full results. Early Spring is the best time for the treatment, usually about 2 weeks before you would normally see the weed develop. In either case, just be sure to use the liquid product as the granular does not release fast enough to be effective. When treating by pouring or spraying, you will want to make sure the product gets underneath the floating weed for best results. Duckweed and Watermeal can produce thick mats on the surface and the chemical will just dissolve in the sun before it penetrates the weed (if the chemical is just spraying over the surface of the water). Please let us know if you have any further questions.

]]> By: Cindy Corritore http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-1112 Cindy Corritore Mon, 14 Sep 2009 15:17:28 +0000 http://thepondguy.wordpress.com/?p=111#comment-1112 Along these same lines - we treated our 1.5 acre pond (has small island in middle) for duckweed this spring - used what Sonar recommended - their new product (pour in pond rather than spray). Worked well - then watermeal took over. We have never had that before. At this point it is covering the entire pond except the 20' spot where our bubbler is for our fish. My question - I know you recommend WhiteCap - is it too late to apply it since it is starting Fall now? When should be apply it in the Spring. Lastly, will it also kill duckweed or should we use the Sonar product again next Spring? Thanks much - C Along these same lines – we treated our 1.5 acre pond (has small island in middle) for duckweed this spring – used what Sonar recommended – their new product (pour in pond rather than spray). Worked well – then watermeal took over. We have never had that before. At this point it is covering the entire pond except the 20′ spot where our bubbler is for our fish.

My question – I know you recommend WhiteCap – is it too late to apply it since it is starting Fall now? When should be apply it in the Spring. Lastly, will it also kill duckweed or should we use the Sonar product again next Spring?

Thanks much –

C

]]> By: thepondguy http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-831 thepondguy Thu, 02 Jul 2009 14:12:31 +0000 http://thepondguy.wordpress.com/?p=111#comment-831 I haven't heard of watermeal hurting the horses so I think your okay there, but I have heard of watermeal causing a fish die off. Similar to what I mentioned about duckweed above. What can happen over time is that watermeal can cover your entire pond like a mat. If this is left like this it can cause a summer fish kill by limiting photosynthesis to the submerged plants below. This will deprive the overall pond of oxygen. If this level gets low enough, it will be lethal to fish. As for WhiteCap, there are no water use restrictions except for a 30 day irrigation. So for animal drinking/swimming you are good to go. I haven’t heard of watermeal hurting the horses so I think your okay there, but I have heard of watermeal causing a fish die off. Similar to what I mentioned about duckweed above. What can happen over time is that watermeal can cover your entire pond like a mat. If this is left like this it can cause a summer fish kill by limiting photosynthesis to the submerged plants below. This will deprive the overall pond of oxygen. If this level gets low enough, it will be lethal to fish.

As for WhiteCap, there are no water use restrictions except for a 30 day irrigation. So for animal drinking/swimming you are good to go.

]]> By: Susanne http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-830 Susanne Thu, 02 Jul 2009 14:00:53 +0000 http://thepondguy.wordpress.com/?p=111#comment-830 sorry sent message & was not through! I have horses that i removed from the pond when it started scumming over but would like to move them back to that pasture- have you ever heard of watermeal hurting horses if they drink it and also if we treat the pond with WhiteCap would it be safe for the horses as well? Thanks sorry sent message & was not through! I have horses that i removed from the pond when it started scumming over but would like to move them back to that pasture- have you ever heard of watermeal hurting horses if they drink it and also if we treat the pond with WhiteCap would it be safe for the horses as well? Thanks

]]> By: Susanne http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-829 Susanne Thu, 02 Jul 2009 13:56:27 +0000 http://thepondguy.wordpress.com/?p=111#comment-829 the the first time in 10 years my pond has watermeal growing in it. We have treated it with AquaShade but it only worked for a couple of days. We have had a maaive fish die off also since whe watermeal appeared. I the the first time in 10 years my pond has watermeal growing in it. We have treated it with AquaShade but it only worked for a couple of days. We have had a maaive fish die off also since whe watermeal appeared. I

]]> By: thepondguy http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-790 thepondguy Fri, 19 Jun 2009 13:51:14 +0000 http://thepondguy.wordpress.com/?p=111#comment-790 Laurie, The only water use restriction on WhiteCap is a 30 day irrigation. When it comes to swimming, any wildlife or fish, you will be fine. Duckweed is still in the growing season. The best time to treat duckweed is when it is still growing because it will take in the aquatic herbicide much more aggressively. What can happen with duckweed over time is that it can cover your entire pond like a mat. If this is left like this it can cause a summer fish kill by limiting photosynthesis to the submerged plants below. This will deprive the overall pond of oxygen. If this level gets low enough, it will be lethal to fish. From what you describe with the water spraying into the air sounds like you have a fountain. <a href="http://www.thepondguy.com/category/170" rel="nofollow">Fountains</a> work great in ponds that are 6' or less. A bottom bubbler diffuser such as an <a href="http://www.thepondguy.com/category/pond-and-lake-aeration-airmax-systems" rel="nofollow">Airmax Aeration System</a> works great when the water is 6' or deeper. Here is one of my blog post on <a>aeration</a>. Hopefully it sheds some light for you. Thanks for the question. Take Care! Laurie,

The only water use restriction on WhiteCap is a 30 day irrigation. When it comes to swimming, any wildlife or fish, you will be fine.

Duckweed is still in the growing season. The best time to treat duckweed is when it is still growing because it will take in the aquatic herbicide much more aggressively.

What can happen with duckweed over time is that it can cover your entire pond like a mat. If this is left like this it can cause a summer fish kill by limiting photosynthesis to the submerged plants below. This will deprive the overall pond of oxygen. If this level gets low enough, it will be lethal to fish.

From what you describe with the water spraying into the air sounds like you have a fountain. Fountains work great in ponds that are 6′ or less. A bottom bubbler diffuser such as an Airmax Aeration System works great when the water is 6′ or deeper.

Here is one of my blog post on aeration. Hopefully it sheds some light for you.

Thanks for the question. Take Care!

]]> By: Laurie http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-787 Laurie Thu, 18 Jun 2009 22:10:56 +0000 http://thepondguy.wordpress.com/?p=111#comment-787 My husband and I have a 1-acre pond that is currently covered with duckweed. This is the first time since we have lived there (9 years) that the duckweed has taken over so much. We also have some type of moss under the duckweed. Have read your replies about WhiteCap. Is WhiteCap toxic in anyway to humans/birds/fish, etc.? Is it too late to use it kill off the duckweed and get my beautiful pond back for this year? If we don't get the duckweed under control, will it harm the fish we've stocked in the pond? Finally, we used to have a pond that pumped water from the pond and sprayed it back onto the surface. We thought this would be beneficial for the pond and helped add oxygen. Wondering your thoughts on whether this is a good thing for a pond? My husband and I have a 1-acre pond that is currently covered with duckweed. This is the first time since we have lived there (9 years) that the duckweed has taken over so much. We also have some type of moss under the duckweed.

Have read your replies about WhiteCap. Is WhiteCap toxic in anyway to humans/birds/fish, etc.?
Is it too late to use it kill off the duckweed and get my beautiful pond back for this year? If we don’t get the duckweed under control, will it harm the fish we’ve stocked in the pond?

Finally, we used to have a pond that pumped water from the pond and sprayed it back onto the surface.
We thought this would be beneficial for the pond and helped add oxygen. Wondering your thoughts
on whether this is a good thing for a pond?

]]> By: thepondguy http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-776 thepondguy Mon, 15 Jun 2009 17:36:11 +0000 http://thepondguy.wordpress.com/?p=111#comment-776 Michelle, Once duckweed begins to take over a pond, it doesn't take long before it takes the whole thing over. Since the duckweed are prolific growers, you may find that the Grass Carp have a hard time keeping up with the growth. You may not see much of a decline once the duckweed gets a hold for the season. Grass Carp do have some drawbacks. Some states, like us here in Michigan, restrict the use of Grass Carp for the sake of The Great Lakes. Grass Carp can really destroy a ecosystem over time. I would highly recommend the <a href="http://www.thepondguy.com/product/1585/212" rel="nofollow">WhiteCap</a>. Its highly effective and simple to use. Michelle,

Once duckweed begins to take over a pond, it doesn’t take long before it takes the whole thing over. Since the duckweed are prolific growers, you may find that the Grass Carp have a hard time keeping up with the growth. You may not see much of a decline once the duckweed gets a hold for the season.

Grass Carp do have some drawbacks. Some states, like us here in Michigan, restrict the use of Grass Carp for the sake of The Great Lakes. Grass Carp can really destroy a ecosystem over time.

I would highly recommend the WhiteCap. Its highly effective and simple to use.

]]> By: Michelle http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-770 Michelle Mon, 15 Jun 2009 02:16:21 +0000 http://thepondguy.wordpress.com/?p=111#comment-770 My husband's family has about a 1 1/2 acre pond in SC. It is totally infested with duckweed. Some advice that they have heard is to get some grass carp the other advice it to get the chemical that will kill it this year. I am thinking that they need to do both, get the WhiteCap to kill it now and the grass carp for future maint, right? please advise. My husband’s family has about a 1 1/2 acre pond in SC. It is totally infested with duckweed. Some advice that they have heard is to get some grass carp the other advice it to get the chemical that will kill it this year. I am thinking that they need to do both, get the WhiteCap to kill it now and the grass carp for future maint, right? please advise.

]]> By: thepondguy http://blog.thepondguy.com/2008/06/24/controling-duckweed-watermeal-pond-lake-q-a-week-of-june-6th/#comment-722 thepondguy Wed, 03 Jun 2009 12:23:43 +0000 http://thepondguy.wordpress.com/?p=111#comment-722 Malenda, The sprayer we use to spray on any type of chemical is called our <a href="http://www.thepondguy.com/product/690/pond-and-lake-application-tools-and-accessories" rel="nofollow">Airmax Pond Sprayer</a>. You mix the product into the sprayer, build pressur by pumping the handle and then spraying by pulling the trigger. Just remember that Reward/<a href="http://www.thepondguy.com/product/1726/20" rel="nofollow">RedWing</a> is a short-term control of watermeal. If you are looking for season-long treatment of watermeal, I would suggest a href="http://www.thepondguy.com/product/1585/212">WhiteCap</a>. Malenda,

The sprayer we use to spray on any type of chemical is called our Airmax Pond Sprayer. You mix the product into the sprayer, build pressur by pumping the handle and then spraying by pulling the trigger. Just remember that Reward/RedWing is a short-term control of watermeal. If you are looking for season-long treatment of watermeal, I would suggest a href=”http://www.thepondguy.com/product/1585/212″>WhiteCap.

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