NPDN 2007 Meeting - Remote detection and quantification of wheat infected with Wheat streak mosaic virus in the Texas Panhandle

NPDN National Meeting 2007

Poster Abstract

Remote detection and quantification of wheat infected with Wheat streak mosaic virus in the Texas Panhandle

Authors: David C. Jones, CHARLIE M. RUSH

Affiliations: Texas Agricultural Experiment Station, Bushland, TX, USA

Wheat streak mosaic virus (WSMV) is the predominate viral pathogen of hard red winter wheat throughout the Texas Panhandle but little has been done to quantify disease incidence on a regional level. In 2005 – 2006, a survey was conducted to quantify WSM. Satellite images of 26 counties in the Texas panhandle were acquired during the growing season and used to classify the vegetative status of wheat. Ninety three fields were selected for ground truth data and tested for WSMV. Normalized difference vegetative index was calculated during January 2006 to mask all areas except green vegetation. Images taken throughout the season were processed using maximum likelihood classification. Out of 93 fields, 58 tested positive for WSMV. These fields were used as training classes for the classification. The total area observed was 6.4 million ha of which 2.3x105 ha were classified as wheat. The first image set, acquired in January 2006, showed that 2.1x105 ha were classified as healthy. The model classified 1.7x104 ha as infected by WSMV. Although other variables mimicked WSM symptoms, the classification accuracy, based on ground truth data, was 95%. This suggests that Landsat imagery can be used to detect and quantify WSM on a regional basis.

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