Southeastern Ornamental Horticulture Production and Integrated Pest Management

News alerts and tips from Southeastern universities.

Preemergence-applied Herbicides for Liriope

A common question I (Matthew Chappell) get is, “what reemergence herbicides can be utilized with liriope?”

Well – let’s give this a whirl!

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Authors: Christine K. Hayes, Charles H. Gilliam, Gary J. Keever, John W. Olive, and D. Joseph Eakes (Auburn University Horticulture Dept.)

Liriope is a herbaceous perennial commonly propagated by division. A current nursery practice (Flowerwood Nursery, Loxley, Alabama) is to delay herbicide application until 2 to 4 weeks after division. While these newly divided liners are in the nursery, weed infestation commonly occurs, resulting in the need for extensive hand weeding before preemergence herbicides are applied. Delayed application of preemergence herbicides is based on concerns that root suppression will occur with use of dinitroaniline (DNA) herbicides and that foliar injury will result following applications of non-DNA herbicides. The primary mode of action of DNA herbicides is through root suppression, but these herbicides have a low solubility, reducing their movement in the root zone.

Most of the preemergence herbicides used in nursery and landscape crop production are DNA herbicides or contain a DNA component. The objective of our study was to evaluate several preemergent herbicides for injury and root growth suppression of Liriope muscari ‘Big Blue’ immediately after division and potting.

Get the rest of the publication here:

http://www.aaes.auburn.edu/comm/pubs/researchreports/ornamentals99/control/liriope.php