HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Weidenhamer, J. D. Articles by Sobotka, F. E. Search for Related Content PubMed Articles by Weidenhamer, J. D. Articles by Sobotka, F. E. Agricola Articles by Weidenhamer, J. D. Articles by Sobotka, F. E.

Dicamba Injury to Soybean

Dep. of Chemistry, 232 Choppin Hall, Louisiana State Univ., Baton Rouge, LA 70803
Dep. of Agronomy, Mississippi State Univ., P.O. Box 5248, Mississippi State, MS 39762
Sobotka, Sandoz LTD. Agro Div., 4002 Basel, Switzerland

^* Corresponding author.

Dicamba (3,6dichloro-2-methoxybemoic acid) effectively controls many dicotyledonous weeds, but nontarget species such as soybean [Glycine max (L.) Merrill) are susceptible to spray or vapor drift. Field studies were conducted on a Canfield silt loam (fineloamy, mixed, mesic Aquic Fragiudalf) soil to determine the response of ‘Elf’ and ‘Williams’ soybean to dicamba over a wide range of applied rates, and to evaluate the use of dicamba injury symptoms to predict yield reductions. Soybean yield in response to increasing rates of dicamba was described by equations of the form y = Aexp( –bx), where y = yield, A = maximum yield (rate = 0 g ha^–1), b is a constant, and x = rate of dicamba applied. Height reduction, seed number ha^–1, and morphological symptoms of dicamba injury were useful in assessing yield reduction. Except for Elf soybean treated at the midbloom stage, there was no yield reduction without height reduction, regardless of foliar symptoms. Seed number ha^–1 decreased with increasing rates of dicamba and was closely correlated with yield. Yield reductions greater than 10% were indicated by severe morphological symptoms of injury, such as terminal bud kill, splitting of the stem, swollen petioles, and curled, malformed pods. Other foliar symptoms, such as distinctive crinkling and cupping of the terminal leaves, occurred at rates much lower than those required to cause yield reductions.

Received for publication June 28, 1988.

This article has been cited by other articles:

				S. M. Andersen, S. A. Clay, L. J. Wrage, and D. Matthees Soybean Foliage Residues of Dicamba and 2,4-D and Correlation to Application Rates and Yield Agron. J., May 1, 2004; 96(3): 750 - 760. [Abstract] [Full Text] [PDF]