Abstract
A hyperspectral imager was used to differentiate herbicide-resistant versus herbicide-susceptible biotypes of the agronomic weed kochia, in different crops in the field at the Southern Agricultural Research Center in Huntley, Montana. Controlled greenhouse experiments showed that enough information was captured by the imager to classify plants as either a crop, herbicide-susceptible or herbicide-resistant kochia. The current analysis is developing an algorithm that will work in more uncontrolled outdoor situations. In overcast conditions, the algorithm correctly identified dicamba-resistant kochia, glyphosate-resistant kochia, and glyphosate- and dicamba-susceptible kochia with 67%, 76%, and 80% success rates, respectively.
Highlights
An increasing problem in crop production systems across the U.S Great Plains is the emergence of kochia (Kochia scoparia [L.] Schrad.) biotypes resistant to the herbicides glyphosate and dicamba.[1,2] Since 1969, kochia has been recognized as one of the most economically significant weed problems in sugar beets, as kochia densities as low as 0.1 plants m−1 of sugar beet row can cause a 10% sugar beet yield reduction.[3]
We used the differences in each spectrum found using the alternate calibration methods, which sharply drew out the difference in the location of the red edge between resistant and dicamba-susceptible kochia when compared with wheat
Downloaded From: https://www.spiedigitallibrary.org/journals/Journal-of-Applied-Remote-Sensing on 24 Feb 2022 Terms of Use: https://www.spiedigitallibrary.org/terms-of-use illumination, with seven potted kochia plants placed among spring wheat (15 to 20 cm in height and grown under identical conditions, as described previously)
Summary
An increasing problem in crop production systems across the U.S Great Plains is the emergence of kochia (Kochia scoparia [L.] Schrad.) biotypes (i.e., strains of a species) resistant to the herbicides glyphosate and dicamba.[1,2] Since 1969, kochia has been recognized as one of the most economically significant weed problems in sugar beets, as kochia densities as low as 0.1 plants m−1 of sugar beet row can cause a 10% sugar beet yield reduction.[3]. Dicamba is an effective herbicide for controlling glyphosate-resistant kochia;[8] occurrence of kochia biotypes with resistance to dicamba makes glyphosate-resistant kochia control even more challenging, and is a concern for cereal and corn producers in Montana and other Great Plains states.[2,9] First documented in wheat fields near Fort Benton, Montana, in 1994,10,11 the recent spread of dicamba-resistant kochia in six states in the Great Plains region seriously limits the herbicide tools to manage kochia under reduced-tillage systems of this region.[2,9]
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