Remote Sensing of Spider Mite Damage in California Peach Orchards Keywords: Aerial Imagery Integrated Pest Management Partial Least Squares (pls) Regression Prunus Persica Remote Sensing Spectral Reflectance Spectroradiometer-猫眼课题宝

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E. Luedeling;A. Hale;Minghua Zhang;W. Bentley;L. C. Dharmasri

Remotely sensed information is increasingly being used in modern agricultural production systems. While most efforts to detect crop statuses or processes affecting crops have focused on field crops (e., several recent studies have looked into applications of remote sensing techniques in orchards. Perez-Priego et al. (2005) and Suarez et al. (2008) used spectral signatures of olive leaves and canopies for detecting water deficiency, while Sepulcre-Canto et al. (2007) related spectral information with olive yield and fruit parameters. In citrus, Ye et al. (2007) related the electromagnetic reflectance of canopies to yields, whereas Min and Lee (2005) used remotely sensed vegetation indices to approximate leaf nitrogen content. Other researchers have used remote sensing to estimate the chlorophyll content of orchard crops (Zarco-Tejada et al., 2004), the extent of chilling injury on citrus fruits (Menesatti et al., 2005) or infection of apple leaves with the fungus Venturia inaequalis (Cooke) Wint., the causal agent of apple scab (Delalieux et al., 2007). In California, remote sensing is widely used in field crop but has so far found little to no application in tree crops. Due to the large extent of the fruit and nut production area in the state and the high value of the crops that are produced, improved monitoring and management strategies are needed to remain competitive in the increasingly global market for tree and nut crops. Such innovations are also necessary to meet presumably rising irrigation water costs and to manage agricultural pests in the face of tightened pesticide regulation. Growers of peaches (Prunus persica L.) in California are currently facing particular economic strains. Historically, profit margins have been high for California peach growers, because of the state's favorable climate and strong domestic demand for fresh and canned peaches. In recent years, however, competition by foreign producers has increased substantially, with the value of imports from Chile already amounting to a quarter of the value of the national production (CDFA, 2008; FAO, 2008). This competition has led to a 9% decrease in the peach production area and a 27% drop in total production in California between 2004 and 2006 (CDFA, 2008). Since farm wages cannot realistically be expected to decrease, technological progress seems the most viable way forward to increase the competitiveness of peach production in California. Remote Sensing can be a valuable tool for thoroughly monitoring orchards at low cost at a spatial resolution that is high enough to allow …

Remote Sensing of Spider Mite Damage in California Peach Orchards Keywords: Aerial Imagery Integrated Pest Management Partial Least Squares (pls) Regression Prunus Persica Remote Sensing Spectral Reflectance Spectroradiometer

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