Using Remote Sensing to Distinguish Common (Isocoma coronopifolia) and Drummond Goldenweed (Isocoma drummondii)

Common and Drummond goldenweed are troublesome subshrubs that often invade rangelands in southern Texas. Both species produce a profusion of conspicuous golden-yellow flowers in the fall. Common goldenweed flowers from late September to mid-October, whereas Drummond goldenweed flowers from mid- November to early December. Plant canopy reflectance measurements made on both species showed that they had higher visible (0.63- to 0.69-gm waveband) reflectance than did associated plant species and bare soil during flowering. Flowering common and Drummond golden- weed plants had a yellow image on conventional color (0.40- to 0.70-am) aerial photographs that made them distinguishable from associated plants and soil. Computer analyses of the conventional color film transparencies showed that common and Drummond goldenweed infesta- tions could be quantified from associated vegetation and soil. Flowering common goldenweed plants could also be detected on conventional color aerial video imagery. Nomenclature: Common goldenweed, Isocoma coronopifo- lia (Gray) Greene #3 IOCCO; Drummond goldenweed, Isocoma drummondii (T.&G.) Greene, # HAPDR. Additional index words. Reflectance, conventional color photography, color-infrared photography, conventional color video imagery, rangelands, IOCCO, HAPDR.

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