Ms. Mrunalini R. Badnakhe Profile

Mrunalini R. Badnakhe

at Indian Institute of Technology Bombay

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Proceedings Article | 14 October 2015 Paper

Disease stress detection on citrus using a leaf optical model and field spectroscopy

Mrunalini Badnakhe, Surya Durbha, J. Adinarayana

Proceedings Volume 9637, 963709 (2015) https://doi.org/10.1117/12.2194486

KEYWORDS: Field spectroscopy, Data modeling, Photosynthesis, Radiative transfer, Reflectivity, Agriculture, Remote sensing, Transmittance, Carbon, Biological research

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As citrus is progressively contributing to horticultural production, wealth and economy of a country, it is necessary to understand the factors impacting citrus production. Gummosis is one of the most serious diseases causing considerable loss of overall citrus production and yield quality. A qualitative and quantitative analysis of citrus leaf biochemical properties are necessary to monitor the crop health, disease /pest stress and production. Total leaf chlorophyll content (C_ab) represents one of the key biochemical factors which contributes in water, carbon, and energy exchange processes. Photosynthesis process in citrus will be disturbed as gummosis disease life cycle progresses. It is important to study C_ab to evaluate the photosynthesis rate and disease stress. In this study the potential of Radiative Transfer (RT) PROSPECT model to retrieve C_ab in citrus orchards was undertaken at different sites. The main goal is to evaluate the relationship between C_ab and gummosis disease stress for citrus at various phenological stages. Inversion of PROSPECT model on measured hyperspectral data is carried out to extract the leaf level parameters influencing the disease. This model was inverted with the ground truth hyperspectral reading. The testing was separately initiated for healthy and infected plant leaves. This can lead to understand the disease stress on citrus leaves. For accuracy, raw spectra are filtered and processed which is an input parameter for Inversion PROSPECT model. Here, retrieved C_ab content was correlated with gummosis disease stress in terms of oozing with R² = 0.6021 and RMSE= 0.481272.

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