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Walnut Response to Multiple Exposures to Simulated Drift of Bispyribac-Sodium

Published online by Cambridge University Press:  20 July 2018

Mariano F. Galla ,
Kassim Al-Khatib  and
Bradley D. Hanson
Mariano F. Galla
Affiliation:
Graduate Student, Department of Plant Sciences MS4, University of California, One Shields Avenue, Davis, CA, USA
Kassim Al-Khatib*
Affiliation:
Professor and Cooperative Extension Specialist, Department of Plant Sciences MS4, University of California, One Shields Avenue, Davis, CA, USA
Bradley D. Hanson
Affiliation:
Cooperative Extension Specialist, Department of Plant Sciences MS4, University of California, One Shields Avenue, Davis, CA, USA
*
Author for correspondence: Kassim Al-Khatib, Professor, Department of Plant Sciences MS4, University of California, One Shields Avenue, Davis, CA 95616. (E-mail: kalkhatib@ucdavis.edu)
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Abstract

A field study was established to evaluate symptoms, growth, yield, and nut quality of walnut trees subjected to multiple exposures of simulated bispyribac-sodium drift. Nut yield the year following simulated drift treatment was also evaluated because tissue differentiation for future fruiting position occurs in the prior season. Bispyribac-sodium was applied four times, at weekly intervals, at 0.5% and 3% of the use rate in rice (45 g ai ha-1). Injury from the 0.5% rate exceeded 5% after three applications. In general, the severity of the symptoms peaked 14 d after last application (23% and 40% injury for 0.5% and 3% rate, respectively) and subsequently remained nearly constant over the duration of the study. Growth of shoots treated with the 0.5% rate was initially delayed during the treatment regime but recovered after treatments ended; however, walnut shoots exposed to the higher rate had fewer internodes than nontreated trees at the end of the season. No measurable reduction in walnut yield or average nut weight either in the year of exposure or in the subsequent year was observed. However, both rates negatively affected walnut kernel color in the year of exposure.

Keywords

Daniel Stephenson, Louisana State University Agricultural CenterBispyribac-sodiumrice, Oryza sativa L.walnut, Juglans regia L.Crop injuryherbicide drift
Type
Weed Management-Other Crops/Areas
Information
Weed Technology , Volume 32 , Issue 5 , October 2018 , pp. 618 - 622
Copyright
© Weed Science Society of America, 2018 

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