Effect of a Pinolene-base Antitranspirant on Fruit Growth, Net Photosynthesis, Transpiration, and Shoot Growth of ‘Golden Delicious’ Apple Trees1
Open Access
- 1 January 1978
- journal article
- Published by American Society for Horticultural Science in Journal of the American Society for Horticultural Science
- Vol. 103 (1) , 17-19
- https://doi.org/10.21273/jashs.103.1.17
Abstract
Sprays of 0.5% poly-1-p-menthen-8-9-diyl (Vapor Gard), an antitranspirant, decreased fruit size but had no influence on russet or fruit quality of field-grown ‘Golden Delicious’ apple (Malus domestica Borkh.). Laboratory experiments in growth chambers with potted ‘Golden Delicious’ apple trees indicated that: 1) Vapor Gard at concentrations of 0.25, 0.5, 1.0, and 2.0% tended to decrease net photosynthesis (Pn) and transpiration (Tr) for 1 to 7 days under optimum soil moisture conditions; 2) under conditions of low soil moisture, 2.0% Vapor Gard sprays reduced Pn and Tr significantly, but did not reduce symptoms of injury from moisture stress; and 3) Vapor Gard did not affect shoot growth over a 21-day period.Keywords
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