Re: mowing Siberians/RoundUp tolerance

In a message dated 7/18/2004 12:19:58 PM Central Daylight Time, krw25@cornell.edu writes:


The weeds died pretty quickly; the irises
showed little effect at first, then most of the foliage turned brown.  But
after about 6 weeks, it looks like they would recover if I don't dig them.
         My conclusion is that Siberian hybrids aren't quite a
Roundup-ready crop, but are pretty tolerant of it.


You have conducted an interesting and valuable experiment. What is missing is an answer to the question, " Were the subject siberians in active growth at the time of spraying?" And,  "Is there a way one might discern the degree of active growth if existing?"

Apparently several (maybe most) iris species are fairly tolerant of Roundup. In the TB group the most obvious detriment is bloom distortion (there remains some reservation concerning retardation of increase here) when over-spray contacts the plant at anytime other than summer dormancy and even then sometimes. Spring sprayin' nearly, but not always, causes bloom distortion from over-spray contact. <definitely not a controlled experiment here and mostly gut feel>

Recent discussions on the species group provided some valuable input on Roundup tolerance of some species.

We need more work (science) such as yours under controlled conditions to determine what, why, where, and when for all iris species.

Thanks for valuable information.
Smiles,
Bill Burleson

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