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Woody Plant Shoot Management and Response to Herbicidal Treatment

Published online by Cambridge University Press:  12 June 2017

R. P. Upchurch ,
J. A. Keaton  and
H. D. Coble
R. P. Upchurch
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, North Carolina Agricultural Division, Monsanto Co., St. Louis, Mo.
J. A. Keaton
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, North Carolina Elanco Products Co., Raleigh, North Carolina
H. D. Coble
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, North Carolina Agronomy Department, University of Illinois, Urbana, Illinois
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Abstract

Shoots of naturally established, foliated red maple (Acer rubrum L.) and persimmon (Diospyros virginiana L.) growing in North Carolina were treated with 2,4-dichlorophenoxyacetic acid (2,4-D) or 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) formulations following various shoot management procedures. Shoot management prior to treatment consisted of decapitating or not decapitating shoots at 2 inches above the ground line in May when the plants were 3 to 6 ft high. Herbicidal applications were made to uncut shoots and to resprouts of previously cut shoots at 30 and 60 days after decapitation. Responses measured 10, 14, and 22 months after treatment were percent control or original shoots, percent control of new shoots, shoot height, number of live stems/plant. The original shoot and new shoot values were averaged to provide a total shoot control index. Spraying of previously cut shoots at 30 or 60 days after cutting was more effective than spraying of uncut shoots except for 2,4,5-T applied to persimmon. The average total shoot control index for 2,4-D treated red maple, considering all rates, application dates, and evaluation dates was 82% for previously cut shoots and 56% for uncut shoots while the corresponding heights were 0.9 and 4.2 ft, respectively. For 2,4,5-T-treated red maple, the total shoot control indices were 92% and 78% for previously cut and uncut shoots, respectively, while the corresponding heights were 0.4 and 1.4 ft. For persimmon, there was a net advantage for treating previously cut shoots with 2,4-D, but the reverse was true for 2,4,5-T. The results are consistent with the theoretical behavior of 2,4-D and 2,4,5-T in woody plants outlined as a basis for conducting the study. Alternate explanations of results are proposed and practical implications described.

Type
Research Article
Information
Weed Science , Volume 17 , Issue 2 , April 1969 , pp. 175 - 180
Copyright
Copyright © 1969 Weed Science Society of America 

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References

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