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Leaf Surface Morphology of Erythroxylum sp. and Droplet Spread

Published online by Cambridge University Press:  12 June 2017

Chester G. McWhorter  and
Clark Ouzts
Chester G. McWhorter
Affiliation:
Appl. Tech. Res. Unit, USDA-ARS. Stoneville, MS 38776
Clark Ouzts
Affiliation:
Appl. Tech. Res. Unit, USDA-ARS. Stoneville, MS 38776
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Abstract

Studies were conducted to examine the micromorphology of leaf surfaces of coca and nova plants and to determine which spray diluents provided optimum coverage of leaf surfaces. Adaxial leaf surfaces of both species were covered with a smooth layer of polygonal-shaped epidermal cells which were covered with wax crystals. Abaxial leaf surfaces were composed only of papillae cells and the guard and subsidiary cells surrounding stomata. Abaxial leaf surfaces of both species were also covered with wax crystals. Average wax weights were 28 to 53 μg cm−2. Water droplets containing an organosilicone surfactant at 0.1% by vol spread better on leaf surfaces that did other adjuvants. Droplets of several different petroleum-based oils spread much better on leaf surfaces than either water droplets with adjuvants or droplets of soybean or cottonseed oil.

Keywords

E. coca, erythroxylum coca var. coca Lam.E. novo, Erythroxylum novogranatense var. novogranatense (Morris) HieronWax crystalsadjuvantspread coefficients
Type
Weed Biology and Ecology
Information
Weed Science , Volume 42 , Issue 1 , March 1994 , pp. 18 - 26
Copyright
Copyright © 1994 by the Weed Science Society of America 

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