Spectral Characteristics of Citrus Greening (Huanglongbing) Ashish Mishra, Graduate Research Assistant, CREC, UF (amishra@ufl.edu)

摘要

Huanglongbing (HLB), also known as citrus greening is one of the most destructive disease in citrus due to the non-specific nature of disease symptoms and absence of a reliable early detection method, this disease can not identified in trees effectively in the grove. Hyperspectral imaging may have the potential to detect HLB-in at earlier early stages. A FieldSpec spectroradiometer (350-2500 nm) was used to detect HLB-infected trees. Discriminability, spectral derivative analysis and spectral ratio analysis were used to distinguish HLB. It was found that the spectral bands of green to red and near infrared have the ability to discriminate HLB-infected trees from healthy trees. These wavelength regions include green peak wavelengths at around 530-564nm, 710-715 nm (red edge), and near infrared wavelengths of 1041 nm and 2014 nm.