News from IAB

The mission of the International Association of Bryologists (IAB), as a society, is to strengthen bryology by encouraging interactions among all persons interested in byophytes.

Wednesday, February 18, 2009

Casoron herbicide and Preen Weed Preventer Herbicide

Subject: BRYONET: herbicides and bryophytes
Date: Tue, 27 Jan 2009 21:15:17 -0800
From: Lee Ellis <>


There are two preemergence herbicides which appear to inhibit bryophyte
growth - Casoron granular herbicide and Preen Weed Preventer Herbicide.

No controlled studies to confirm, (and also from fairly casual
observations) I have observed that bryophytes are generally absent in
both gravel areas and areas around fruit trees where either of these
herbicides have been applied. Casoron appears to be much more effective
in preventing bryophytes -- with longer absence of bryophytes after
application of herbicide -- than Preen.

The active ingredient in Casoron is dichlobenil

The active ingredient in Preen is trifluralin

[also called 2,6-dinitro-N,N-dipropyl-4-trifluoromethylaniline, or

Perhaps someone could do a controlled study.

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