Response of Tokay grapes to spray applications of 2,4-D

Weaver, R; Leonard, O; McCune, S

Response of Tokay grapes to spray applications of 2,4-D

Authors

R. J. Weaver
O. A. Leonard
S. B. McCune

Authors Affiliations

R. J. Weaver was Professor of Viticulture and Viticulturist in the Experiment Station, Davis; O. A. Leonard was Lecturer in Botany and Botanist in the Experiment Station, Davis; S. B. McCune was Senior Laboratory Technician in the Department of Viticulture and Enology, Davis.

Publication Information

Hilgardia 31(12):419-433. DOI:10.3733/hilg.v31n12p419. November 1961.

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Abstract

Tokay vines were sprayed, at different stages of development, with 2,4-D at 2 and 8 ppm, in 1958, 1959, and 1960. The effects from 2,4-D varied from year to year, with much injury in 1958 and 1959, and little or none in 1960. There was little or no cumulative injury from low concentrations from one year to the next.

Most malformed foliage occurred from sprays applied when shoots were about 1 foot long and from sprays applied at the bloom or shatter stage. These sprayings were also most injurious to fruit.

Only extremely low concentrations of 2,4-D were found in fruit of sprayed vines, and only in berries sprayed in 1960 either at the shatter stage or at the final spraying.

Literature Cited

Clore W. J., Bruns V. F. The sensitivity of the Concord grape to 2,4-D. Proc. Amer. Soc. Hort. Sci. 1953. 61:125-34.

Eames Arthur J. Leaf ontogeny and treatments with 2,4-D. Amer Jour. Bot. 1951. 38(10):777-80. DOI: 10.2307/2438201 [CrossRef]

Leonard O. A., Weaver R. J. Absorption and translocation of 2,4-D and amitrole in the shoots of Tokay grape 1961. Hilgardia (in press) DOI: 10.3733/hilg.v28n05p115 [CrossRef]

Leonard O. A., Weaver R. J., Kay B. L. Bioassay methods for determining 2,4-D in plant tissues 1961. Weeds (in press) DOI: 10.2307/4040553 [CrossRef]

McIlrath W. J., Ergle D. R. Further evidence of the persistence of the 2,4-D stimulus in cotton. Plant Physiol. 1953. 28:693-703. DOI: 10.1104/pp.28.4.693 [CrossRef]

Weaver R. J., McCune S. B. Test for activity of growth regulators on grapes. Bot. Gaz. 1959a. 120(3):166-70. DOI: 10.1086/336020 [CrossRef]

Weaver R. J., McCune S. B. Effect of gibberellin on seeded Vitis vinifera, and its translocation within the vine. Hilgardia. 1959b. 28(20):624-45. DOI: 10.3733/hilg.v28n20p625 [CrossRef]

Weaver R. J., Williams W. O. Response of certain varieties of grapes to plant growth regulators. Bot. Gaz. 1951. 113:75-85. DOI: 10.1086/335695 [CrossRef]

Weaver R. J., Winkler A. J., McCune S. B. Some effects of 2,4-dichlorophenoxyacetic acid and related compounds on the grapevine. Amer. Jour. Enol. 1958. 9(3):126-38.

Weaver R. J., Leonard O. A., McCune S. B. Response of clusters of Vitis vinifera grapes to 2,4-D and related compounds. Hilgardia. 1961. 31(5):113-25. DOI: 10.3733/hilg.v31n05p113 [CrossRef]

Weaver R. J., Minarik C. E., Boyd F. T. Influence of rainfall on effectiveness of 2,4-D sprayed for herbicidal purposes. Bot. Gaz. 1946. 107:540-44.

Winkler A. J. Pruning and thinning experiments with grapes. California Agr. Exp. Sta. Bul. 1931. 519: http://archive.org/details/pruningthinninge519wink

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Index