NAA and paclobutrazol control grapevine suckers: vine performance and fruit tissue residues
1991
Reynolds, A.G. | Cottrell, A.C. | Wardle, D.A. | Gaunce, A.P.
'Okanagan Riesling' (Vitis spp. parentage unknown) vine trunks treated in 1984 with three levels of NAA (0, 10,000, and 20,000 mg.liter-1) and three levels of paclobutrazol (PB; 0, 250, and 500 mg.liter-1) in white latex paint were subjected to a reapplication in June 1987 at the same rates of NAA and at 0, 1000, and 2000 mg PB/liter. Linear reductions in suckers per vine were observed with increasing NAA concentration but not PB. Yield and clusters per vine were reduced by PB in the season following retreatment (1988), while berry weight was increased by NAA in 1987. Titratable acidity was increased by NAA in 1988, and pH was highest that season with PB at 1000 mg.liter-1. No PB was detected in fruit tissue in 1987, but NAA levels of 2.4 and 2.0 micrograms.kg-1 were detected in clusters sampled from the 10,000- and 20,000- mg.liter-1 treatments, respectively.
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