RUSSIAN OLIVE CONTROL: HERBICIDE RATES AND TIMING
ISSN 2158-9429
Volume 3, Issue 1 - June 2010
Editor: Linda Chalker-Scott
Abstract
Studies were conducted to determine how herbicide rates and timing of applications influenced the efficacy of herbicides applied to Russian olive (Eleagnus angustifolia) using the frill cut method. Trees were treated in October, 2005 with Roundup (41% glyphosate), Habitat (28.7% imazapyr), or 2,4-D Amine (47.3% dimethylamine salt of 2,4-Dichlorophenoxyacetic acid) at rates of 1.0, 1.5 or 2.0 ml/inch of trunk diameter. All chemicals and rates provided acceptable control of Russian olive, with the 1 ml 2,4-D and the 1.5 ml Roundup treatments showing slightly lower control than other herbicides and rates. This suggests that 1 ml of herbicide/inch of trunk diameter is an acceptable rate using the frill cut method. In a follow-up study, trees were treated with 1 ml/inch of trunk diameter of Roundup or 2,4-D each month from November, 2006 through September, 2007. The results were compared with the 1.0 ml October treatment of the same chemical in the previous study. For 2,4-D, applications in September provided the best control. For Roundup, best control was achieved from applications in January, May, June, July, August and September. This suggests that September is the best time to apply 2,4-D and May through October is the best time to apply Roundup to Russian Olive using the frill cut method.
View/Download Full Article