New Zealand Journal of Crop and Horticultural Science abstracts

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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

PDF file of entire paper: medium quality (915K); (scanned from paper original: notes about this process)

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