New Zealand Journal of Crop and Horticultural Science abstracts
Some effects of soil-applied paclobutrazol on performance
of `Sundrop' apricot (Prunus armeniaca L.) trees
and on residue in the soil
T. JACYNA*
MAFTech
P.O. Box 276
Alexandra, New Zealand
K. G. DODDS
AgResearch
Invermay Agricultural Centre
Private Bag 50034
Mosgiel, New Zealand
*Present address: Cornell University, New York State Agricultural Experiment
Station, Department of Horticultural Sciences, Geneva, NY 14456, United
States.
Abstract Twelve-year-old `Sundrop' apricot (Prunus
armeniaca L.) trees were treated with a single soil application of
paclobutrazol (PBZ) at the rate of 2, 4, and 6 g of active ingredient per tree.
The chemical was applied as a trunk drench. Regardless of rate, PBZ treated
trees had significantly reduced most vegetative growth characteristics and
pruning requirements as compared with control trees. A rate of 2 g PBZ/tree
effectively controlled vegetative growth for 3 years. Bioassay with broad bean
(Vicia faba L.) confirmed that PBZ was still present in the
treated soil almost 3 years after application. The extent of growth suppression
of the indicator plants was in direct relation to the treatment rate.
Keywords paclobutrazol; bioassay; chemical residue; Prunus
armeniaca; Vicia faba
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
323-329
0114-0671/95/2303-0323 $2.50/0 (c) The Royal Society of New Zealand
1995
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