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Pubescence Affects Spectra and Imagery of Silverleaf Sunflower (Helianthus argophyllus)

Published online by Cambridge University Press:  12 June 2017

H.W. Gausman ,
R.M. Menges ,
D.E. Escobar ,
J.H. Everitt  and
R.L. Bowen
H.W. Gausman
Affiliation:
This study was conducted at Weslaco, Texas. Plant Physiol., Hortic., Biol. Tech., Range Conserv., and Photographer, respectively. This study was supported in part by the National Aeron. and Space Admin. under Contract No. S-53876-AG, Southern Region, Agric. Res. Serv., U. S. Dep. Agric., Weslaco, TX 78596
R.M. Menges
Affiliation:
This study was conducted at Weslaco, Texas. Plant Physiol., Hortic., Biol. Tech., Range Conserv., and Photographer, respectively. This study was supported in part by the National Aeron. and Space Admin. under Contract No. S-53876-AG, Southern Region, Agric. Res. Serv., U. S. Dep. Agric., Weslaco, TX 78596
D.E. Escobar
Affiliation:
This study was conducted at Weslaco, Texas. Plant Physiol., Hortic., Biol. Tech., Range Conserv., and Photographer, respectively. This study was supported in part by the National Aeron. and Space Admin. under Contract No. S-53876-AG, Southern Region, Agric. Res. Serv., U. S. Dep. Agric., Weslaco, TX 78596
J.H. Everitt
Affiliation:
This study was conducted at Weslaco, Texas. Plant Physiol., Hortic., Biol. Tech., Range Conserv., and Photographer, respectively. This study was supported in part by the National Aeron. and Space Admin. under Contract No. S-53876-AG, Southern Region, Agric. Res. Serv., U. S. Dep. Agric., Weslaco, TX 78596
R.L. Bowen
Affiliation:
This study was conducted at Weslaco, Texas. Plant Physiol., Hortic., Biol. Tech., Range Conserv., and Photographer, respectively. This study was supported in part by the National Aeron. and Space Admin. under Contract No. S-53876-AG, Southern Region, Agric. Res. Serv., U. S. Dep. Agric., Weslaco, TX 78596
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Abstract

Silverleaf sunflower (Helianthus argophyllus Torr. & Gray) is a weed in the sandy soils of south and southeast Texas. The young plant parts are densely white-tomentose. This pubescence greatly increased laboratory and field-measured light reflectance over the 0.5- to 2.5-μm waveband compared with the sparsely-hairy leaves of common sunflower (Helianthus annum L.). This increased reflectance caused silverleaf sunflower's image on Eastman Kodak Aerochrome infrared color type 2443 film to be “pinkish” compared with darker magenta images for other plant species. Therefore, aerial photography may be useful to distinguish silverleaf sunflower plants from other plant species to locate its endemic areas, monitor its spread, and delineate areas needing weed control.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 5 , September 1977 , pp. 437 - 440
Copyright
Copyright © 1977 by the Weed Science Society of America 

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