solani infection with greater than 75% accuracy. infestans infection from both latent and symptomatic A. Individual disease development stages for each pathogen could be differentiated from respective controls with 89–95% accuracy. solani-infected plants with greater than 80% accuracy two–four days before visible symptoms appeared.
Hyperspectral measurements could distinguish both P. We found that respective patterns of spectral change can be related to these differences in underlying disease physiology and their contrasting pathogen lifestyles. solani, a necrotrophic pathogen, causes symptoms to appear almost immediately when environmental conditions are conducive. Phytophthora infestans, a hemibiotrophic pathogen, undergoes an obligate latent period of two–seven days before disease symptoms appear. Here, we used in-situ spectroscopy to detect and differentiate Phytophthora infestans (late blight) and Alternaria solani (early blight) on potato foliage over the course of disease development and explored non-destructive characterization of contrasting disease physiology. Challenging this capacity is the fact that dead tissue yields relatively consistent changes in leaf optical properties, negatively impacting our ability to distinguish causal pathogen identity. This can be used to assess pathogen impact on plant condition both prior to and after visual symptoms appear. In-vivo foliar spectroscopy, also known as contact hyperspectral reflectance, enables rapid and non-destructive characterization of plant physiological status.
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