Experiment 2

METHODS

Herbicides were applied on July 22, 2003 to #1 containers with minor liverwort infestations (covering 25% of the container surface). The following herbicides were applied:

Herbicide Rate
Quinoclamine (Mogeton) 1 oz./gal
Quinoclamine (Mogeton) 2 oz./gal
Quinoclamine (Mogeton) 4 oz./gal
Broadstar 150 lb/acre
TerraCyte 650 lb/acre
Non-treated control  

Irrigation was withheld for 24 hours after herbicide application.

Herbicides were applied to liverwort that covered approximately 25% of the container surface and had no sporocarps present at the time of application.

Data collected included visual ratings of liverwort control at 2 and 14 DAT, and estimation of the percent container surface coverage by liverwort 45 DAT.


RESULTS

Quinoclamine provided 99 to 100% liverwort control by 2 DAT (See figures below). Control was relatively unchanged by 14 DAT, however, by 45 DAT re-colonization had occurred in containers treated with 1 oz./gal.

 

Liverwort control 2 days after herbicide application.

 

Liverwort regrowth 45 days after herbicide application.

 

Images above, from left to right, show liverwort in non-treated controls, treated with 1 oz./gal, 2 oz./gal, and 4 oz./gal. Photos were taken 14 days after herbicide application.

Terracyte and Broadstar provided poor to moderate control throughout the experiment. This and previous research suggests that Terracyte and flumioxazin provide acceptable postemergence liverwort control early in the growing season (March), but control declines throughout the year (data not published).


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