Author
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FITZGERALD, GLENN |
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Submitted to: Agronomy Abstracts
Publication Type: Abstract Only Publication Acceptance Date: 7/29/2002 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: The strawberry spider mite (Tetranchus turkestani) is a serious pest in California cotton and causes reddish discoloration on leaf surfaces that may be detectable through remote sensing. Once mite populations reach a critical threshold the entire field is typically sprayed with pesticide. If outbreak locations can be identified, it might be possible to control them with site specific pesticide applications. To determined whether detection is possible, AVIRIS imagery was collected over USDA-ARS cotton research fields at Shafter CA in 1999. Additionally, spectral signatures were recorded using a liquid crystal tunable filter camera system mounted on a high clearance field vehicle. Cotton plants in the field were imaged and spectra collected from 450-1050 nm for various scene components such as mite damaged areas on leaves, healthy leaves, shadow, and soil background. These signatures were used in a linear spectral unmixing procedure to unmix the AVIRIS data producing abundance maps for each scene component. The procedure successfully distinguished between a field that had been kept mite-free and an adjacent field where mites were allowed to infest the cotton crop. Areas of relatively greater mite damage (abundance) within the mite-infested field were also identified. |
