By: Greg Kruger, Ph.D., Greg R. Kruger, William G. Johnson, Douglas J. Doohan, and Stephen C. Weller
Field studies were conducted to determine the response of sub-lethal glyphosate and dicamba doses to processing tomato flowering lose and marketable yield. Dose response studies for both herbicides were conducted on four commercial processing tomato lines (two different lines within each study) and plants were sprayed at either the vegetative stage or the early bloom stage. Both glyphosate and dicamba caused higher yield losses when sprayed at the early bloom stage. A 25% yield loss was observed with 8.5 and 7.5 g ae ha-1 for glyphosate and dicamba, respectively, at the early bloom stage and 43.9 and 11.9 g ae ha-1 for glyphosate and dicamba, respectively, at the early vegetative stage. Overall, these tomatoes cultivars were more sensitive to dicamba than to glyphosate. We conclude that glyphosate and dicamba drift could have serious implications on tomato yields especially if the drift occurs during flowering.
Field studies were conducted to determine the response of sub-lethal glyphosate and dicamba doses to processing tomato flowering lose and marketable yield. Dose response studies for both herbicides were conducted on four commercial processing tomato lines (two different lines within each study) and plants were sprayed at either the vegetative stage or the early bloom stage. Both glyphosate and dicamba caused higher yield losses when sprayed at the early bloom stage. A 25% yield loss was observed with 8.5 and 7.5 g ae ha-1 for glyphosate and dicamba, respectively, at the early bloom stage and 43.9 and 11.9 g ae ha-1 for glyphosate and dicamba, respectively, at the early vegetative stage. Overall, these tomatoes cultivars were more sensitive to dicamba than to glyphosate. We conclude that glyphosate and dicamba drift could have serious implications on tomato yields especially if the drift occurs during flowering.
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