Author ORCID Identifier

https://orcid.org/0000-0003-3800-5774

Year of Publication

2021

Degree Name

Master of Science in Forest and Natural Resource Sciences (MSFNRS)

Document Type

Master's Thesis

College

Agriculture, Food and Environment

Department/School/Program

Forestry and Natural Resources

First Advisor

Dr. John J. Cox

Abstract

Alliaria petiolata is an invasive biennial herb that poses a substantial threat to various ecosystems across the United States. Imazapic herbicide can control A. petiolata infestations, but there is limited peer-reviewed data on impacts of pre-emergent imazapic spraying to forest floor communities. This research examined the impacts of pre-emergent imazapic (0.84 kg/ha) with Pentra-Bark® surfactant on ground cover of A. petiolata and the spring perennials Claytonia virginica and Erigenia bulbosa. Experimental populations in randomized blocks within two forest stands in central Kentucky received the following treatments at 0.84 kg ai/ha: imazapic with Pentra-Bark®, glyphosate with Pentra-Bark®, Pentra-Bark® alone, and a control with no herbicide. Imazapic treatments significantly reduced ground cover of all tested species, while other herbicidal treatments led to no significant ground cover responses. Imazapic treatments did not always eliminate these species from experimental units, although some C. virginica and E. bulbosa individuals exhibited superficial injury. These findings suggest imazapic (0.84 kg/ha) with Pentra-Bark® surfactant is highly effective against A. petiolata, but may also harm some non-target forest floor plants. Additional research is required to determine impacts at other application rates to these and other non-target forest floor plant species.

Digital Object Identifier (DOI)

https://doi.org/10.13023/etd.2021.294

Funding Information

This study was supported by the Kentucky Native Plant Society's Student Research Grant and the Kentucky Society of Natural History's Research Grant in 2014.

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