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Digital imagery useful for pyrethrum analysis

Image analysis expedites process of determining pyrethrum flower number and pyrethrin yield

Date:
January 11, 2016
Source:
American Society for Horticultural Science
Summary:
Using digital image analysis, scientists developed a rapid, nondestructive method for determining pyrethrum flower number. The utility of using this approach for biomass assessment in pyrethrum is discussed in the report.
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Pyrethrum is a perennial, herbaceous plant grown mainly for the production of pyrethrins. Pyrethrins have insecticidal properties and are commonly used in natural and organic products as a pest control agent. Determining pyrethrin yield, which is measured by flower biomass and pyrethrin ester content of the biomass, has traditionally been accomplished by manually harvesting and counting pyrethrum flowers. These methods are quite labor-intensive, can be destructive to the sampled area, and may cause damage to surrounding crops.

Now, researchers have successfully used digital imaging analysis to measure pyrethrum flower number before the flowers are harvested. Jason Scott, David Gent, Frank Hay, and Sarah Pethybridge published a report in HortTechnology in which they say that image analysis has the potential to enable rapid, nondestructive assessment of flower number for pyrethrum. In the study, the scientists compared digital analysis to the traditional manual method. They found that automated recognition of flowers consistently detected 88% of the flowers detected by manual recognition. "When compared with hand collection and physical counting of flowers from sampling units, the system recognized ≈32% of all flowers collected," the authors noted.

"The key advantages of this automated system are the speed and ease of image collection, and subsequent flower estimation. This enables a much greater plot area to be sampled for yield estimation than manual sampling," the researchers said. "The image analysis approach will greatly improve the speed of estimating an important component of pyrethrum yield."

The authors added that the system could be easily modified for any crop where the color and size of a flower or other plant tissue can be differentiated from the background canopy.


Story Source:

Materials provided by American Society for Horticultural Science. Note: Content may be edited for style and length.


Journal Reference:

  1. Jason B. Scott, David H. Gent, Frank S. Hay and Sarah J. Pethybridge. Estimation of Pyrethrum Flower Number Using Digital Imagery. HortTechnology, October 2015

Cite This Page:

American Society for Horticultural Science. "Digital imagery useful for pyrethrum analysis: Image analysis expedites process of determining pyrethrum flower number and pyrethrin yield." ScienceDaily. ScienceDaily, 11 January 2016. <www.sciencedaily.com/releases/2016/01/160111152802.htm>.
American Society for Horticultural Science. (2016, January 11). Digital imagery useful for pyrethrum analysis: Image analysis expedites process of determining pyrethrum flower number and pyrethrin yield. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2016/01/160111152802.htm
American Society for Horticultural Science. "Digital imagery useful for pyrethrum analysis: Image analysis expedites process of determining pyrethrum flower number and pyrethrin yield." ScienceDaily. www.sciencedaily.com/releases/2016/01/160111152802.htm (accessed May 26, 2017).

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