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Detecting Huisache (Acacia farnesiana) and Mexican Palo-verde (Parkinsonia aculeata) by Aerial Photography

Published online by Cambridge University Press:  12 June 2017

James H. Everitt  and
Ricardo Villarreal
James H. Everitt
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., P.O. Box 267, Weslaco, TX 78596
Ricardo Villarreal
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., P.O. Box 267, Weslaco, TX 78596
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Abstract

Huisache [Acacia farnesiana (L.) Willd. # ACAFA] and Mexican palo-verde (Parkinsonia aculeata L. # PAKAC) are native woody legumes that often occur together on rangelands of southern Texas and northern Mexico. Huisache produces a profusion of orange-yellow flowers during February or March giving it a conspicuous golden appearance. Mexican palo-verde produces a heavy bloom of yellow flowers in mid-April or early May giving it a yellow-green coloration. Plant canopy light reflectance measurements of flowering huisache showed that its reflectance at the 0.55- and 0.65-μm visible wavelengths was significantly higher than that of Mexican palo-verde in the vegetative stage and four other associated plant species or mixture of species. Conversely, reflectance measurements of flowering Mexican palo-verde showed that its reflectance at the 0.55-μm visible wavelength was significantly higher than that of huisache in the vegetative stage and the same four associated plant species or mixtures of species. Flowering huisache had a golden color on conventional color (0.40-to 0.70-μm) aerial photos that made it distinguishable from other plant species, whereas flowering Mexican palo-verde had a pink image on color-infrared (0.50- to 0.90-μm) aerial photos. However, immature plants of both species cannot be detected using this technique. Computer-based image analyses of conventional color film positive transparencies showed that huisache infestations could be quantified from associated rangeland species. This technique can permit ‘percent land area infested’ estimates of mature huisache on rangelands. These results show that aerial photography may be a useful tool to detect and monitor the spread of huisache and Mexican palo-verde on rangelands, and to delineate areas needing control.

Keywords

Remote sensingreflectanceconventional colorcolor-infraredACAFAPAKAC
Type
Special Topics
Information
Weed Science , Volume 35 , Issue 3 , May 1987 , pp. 427 - 432
Copyright
Copyright © 1987 by the Weed Science Society of America 

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