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Herbicide Effectiveness, Soil Residues, and Phytotoxicity to Peach Trees

Published online by Cambridge University Press:  12 June 2017

W. A. Skroch ,
T. J. Sheets  and
J. W. Smith
W. A. Skroch
Affiliation:
Department of Horticultural Science
T. J. Sheets
Affiliation:
Pesticide Residue Research Laboratory
J. W. Smith
Affiliation:
Formerly Pesticide Residue Research Laboratory, North Carolina State University
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Abstract

Dichlobenil (2,6-dichlorobenzonitrile), 3-tert-butyl-5-chloro-6-methyluracil (terbacil), and 3-tert-butyl-5-bromo-6-methyluracil (hereinafter referred to as DP-733) were applied annually for 3 years as soil surface or incorporated treatments for weed control in young peach (Prunus persica (L.) Batsch., var. Redhaven) trees. Average monthly ratings showed significant increases in bermudagrass (Cynodon dactylon (L.) Pers.) control with incorporation of all three herbicides. Treetrunk diameters in incorporated dichlobenil plots were greater than those in surface-applied dichlobenil plots. Incorporation in the soil reduced loss of dichlobenil, terbacil, and DP-733. The herbicides did not accumulate in the 0 to 15-cm soil layer. Low concentrations were detected in the 30 to 60-cm soil depth 1 year after the third annual application of 6.72 kg/ha of dichlobenil and 4.48 kg/ha of DP-733. Terbacil was not present in detectable amounts at 30 to 60 cm but was present in the 15 to 30-cm layer of 4.48 kg/ha plots.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 3 , May 1971 , pp. 257 - 260
Copyright
Copyright © Weed Science Society of America 

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References

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