Re: How to Kill Cat Tails

Posted by Tim B on May 20, 2002 at 07:51:29 from (4.17.173.2):

In Reply to: How to Kill Cat Tails posted by Russ(NC) on May 20, 2002 at 03:57:10:

Russ,

I second the warning re: environmental harm, and getting into legal trouble - I am an environmental consultant in Massachusetts - regulators in these parts would just love the opportunity to "tear you a new one" (or worse) over something like that.

I don't know much about the chemicals you are using, except Roundup. The active ingredient in Roundup - glyphosate - is essentially harmless to animals. However, the surfacants (soaps) they use in it to make it stay on the plants until it dries, and after it gets wet again are very, very, very toxic to aquatic organisms. I would guess you caused a die-off of some portion of the natural community if it got into the pond.

The version of roundup intended for use in and near wetlands is Rodeo - same thing, no surfacants.

I've never tried it on cattail, but I would bet that if you use glyphosate in late summer - September, when the plants are sucking nutrients from the shoots to the roots, It will kill 90% or more of the stand. If you use it in early to mid-summer, the leaves will die, then grow right back again. Again, check out the regulations in NC re: herbicide appilcation in wetlands and waterways!

Cattails won't grow in water that is permenantly inundated with a foot or so of water. If you want to keep them out permenately, dredge the shallow portions of the pond deeper. Again, a permit is likely needed for that, but it may not be too onerus - easier than getting a permit for herbicides, I would guess.

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