TITLE:
Effect of New Auxin Herbicide Formulations on Control of Herbicide Resistant Weeds and on Microbial Activities in the Rhizosphere
AUTHORS:
Vijay K. Nandula, Heather L. Tyler
KEYWORDS:
2, 4-D, Dicamba, Glyphosate, Resistance, Soil Microbiology, Soybean
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.7 No.17,
December
13,
2016
ABSTRACT: Widespread distribution of glyphosate-resistant weeds in soybean-growing areas
across Mississippi has economically affected soybean planting and follow-up crop
management operations. New multiple herbicide-resistant crop (including soybean)
technologies with associated formulations will soon be commercialized. The objectives
of this research were to determine the efficacy of new 2,4-D + glyphosate and
dicamba formulations on herbicide resistant weeds, and to determine the impact of
the new 2,4-D + glyphosate formulation on microbial communities in the soybean
rhizosphere involved in nutrient cycling. New 2,4-D + glyphosate and dicamba formulations
registered for use on 2,4-D and dicamba-resistant soybean, respectively,
adequately controlled glyphosate resistant and susceptible pigweeds (Palmer amaranth and tall waterhemp) and common ragweed. The 2,4-D + glyphosate formulation
did not significantly impact soil microbial activities linked to nutrient cycling in
the soybean rhizosphere. These results indicate these new 2,4-D + glyphosate and
dicamba formulations can be effective in controlling glyphosate resistant and other
herbicide resistant weeds while not having adverse effects on the activities of beneficial
soil microorganisms.