Response of Young Pecan Trees to Repeated Applications of Indaziflam and Halosulfuron

in HortScience

Pecan production in the southeastern United States has increased because of the worldwide demand for the nuts of this tree. Information about the effects of the residual herbicides indaziflam and halosulfuron on newly planted pecan trees was evaluated over time for 4 years on sandy loam soils. After winter pecan tree planting, multiple spring or autumn herbicide applications were applied to the same pecan trees in different experiments in consecutive years. Visual injury, height, and caliper diameter measurements were taken up to six times during the growing season. Regression analysis of treatments over time indicated no differences in pecan tree growth for indaziflam at 73 or 146 g a.i./ha or halosulfuron at 35 g a.i./ha applied up to six times in 3 years, or for indaziflam at 37, 73, or 146 g a.i./ha applied up to five times in 3 years, as compared with nontreated controls. This information will benefit growers seeking viable weed control options when establishing new groves to meet the increased worldwide demand for pecan nuts.

Contributor Notes

This research was partially funded by the University of Georgia College of Agriculture and Bayer Crop Science. Technical support was provided by Sidney Cromer, Fritz Turpin, II, Haydon Davis, and additional statistical support from Jerry Davis, all with the University of Georgia.

We would like to thank Mitch Bolger of Pine Knoll Plantation and Richard Merritt of Merritt Pecan Company for providing materials for this research trial.

Professor.

Technical Service Specialist.

Associate Professor.

Research Professional.

Corresponding author. E-mail: tgrey@uga.edu.

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    Pecan tree growth response to multiple spring applications of indaziflam and halosulfuron over growing degree days from 2011 to 2013 (A) and 2012–14 (B) in Dougherty County, GA. Herbicide application dates are in Table 1 and parameter estimates for linear regression equations are in Table 4.

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    Pecan tree growth response to multiple spring and autumn applications of indaziflam over growing degree days from 2012 to 2014 in Dougherty (A) and Webster Counties (B) in Georgia. Herbicide application dates are in Table 1 and parameter estimates for linear regression equations are in Table 5.

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