Low-Impact, Selective Herbicide Application Techniques to Control Sweet Resinbush in Arizona. A Preliminary Field Guide

摘要

The purpose of this preliminary field guide is to describe low-impact, selective herbicide application techniques that were evaluated for control of sweet resinbush (SRB) shrubs and seedlings at a site in the Upper Verde Valley. Herbicides, such as picloram and clopyralid, are considered to be selective because they can control the target species while having little or no affect on desirable grasses and other nonsusceptible plants. In some cases, selectivity also can be achieved by using spot application to target shrubs and avoiding getting any of the spray on adjacent native species. Improving conditions for revegetation by resident native plants may avoid the need for costly restoration. However, it must be understood that susceptible nontarget plants can be damaged or killed if they are inadvertently sprayed or if their roots absorb the active ingredients from the soil. Based on the initial herbicide applications in January 2003 and follow up monitoring through February 2004, we have determined that satisfactory control results (over 90 percent) can be achieved if the described spray equipment, herbicide mixtures, and application techniques are followed. It must be emphasized that the recommendations in this field guide are preliminary and further testing may result in improvements.