Re: Clopralid (Alligare)
iris@hort.net
  • Subject: Re: Clopralid (Alligare)
  • From: P* <p*@bellsouth.net>
  • Date: Tue, 28 May 2013 16:37:11 -0400
Linda has talked about how slow acting clopralid appears to be. Linda or others, any indication that at labels rates some weeds are suppressed for awhile then recover? ("Label rate" over top Iris, of course, being hypothetical since Iris isn't on the label.) Clovers are the ones I wonder about the most since they are particular PITAs for me. White clover has multiple ways of resisting control and tormenting me. The fact that it germinates all season long (for me anyway), rather than in seasonal spikes (like vetch, many clover and medics) is one of the ways. As I read clopralid has residual effect on legumes, but in warm humid soil conditions, like Linda and I have, is half life is not all that long. Makes me wonder just how many times a year I'd have to apply it even if it worked well at first.
I am turning old fallow pasture into garden beds so I am dealing with lots of different weeds and a huge seed store. Glyphosate, pendimethalin (e.g. Pre-M) and hand-weeding keeps things to the point of keeping my sanity. I think pendimethalin (labeled for use over top Iris) does a reasonably good job considering the diversity of weeds I have but there are some that it is not very effective on, most legumes being among them. (Guilty of not reading the label well enough and thinking the stuff wasn't doing it's job.)
Anyone have experience with isoxaben (e.g Gallery) preemergent? I read it is supposed to have pretty good control of clovers and medics and an application lasts several months. Vetch not on the list but if it controls white clover and medics - me wonders. And it is labeled for use over the top of Iris pumila 'yellow' and Iris siberica. Would chance say most bearded should hang - but that's unsubstantiated.
If isoxaben did the trick on clovers and some other groups named on the label, it plus pendimethalin would pretty much leave me totally uninterested in clopralid and the intrigue that goes with it. 

Shaub
SW NC, Z6b

On 5/26/2013 8:19 AM, Linda Mann wrote:
After hearing others say they have used it over irises with no problems, I used it this year. Very slow acting, but no problems for the irises that I could tell. no apparent negative impact on growth or fertility. 

The constant heavy rain is another story....
The three groups of broadleafs it supposedly works well on are composites (asters, wild lettuce, daisies, etc), legumes (clover, vetch, beans etc) and solanums (horse nettle, tomato, potato, pepper), and to a lesser extent, dock and sorrel (I guess that also means spinach & chard). So lots of warnings about persistence and potential effects on some broadleaf veggies for 2 yrs.
It definitely knocked back the vetch, I thought it hadn't done anything to the composites, but now that they are tall and trying to bloom, they are starting to look really bad, & I didn't have the heart to spray the daisies. yet. Some of the clover I sprayed is looking a little ill, but not dead yet, and the sorrel looks totally unaffected.
Weather was really cool and wet when I sprayed, so will see if some spot treatment of sorrel, dock and clover in sunny weather will work better, or if maybe they need fall treatment?
I feel a bit guilty using this stuff, but I've reached the point where I either spray some of the weeds, or give up trying to grow so many seedlings.
The weather casters are talking about this year's rainfall in relation to the annual record of 90+ inches here! When I was growing up, the 30 yr annual average was ~55 inches. Lately, thanks to a 5 yr drought, the average has been closer to 40 - I think the lowest was 32? Average really doesn't tell much! 

Linda Mann  east TN zone 7b,

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