Multispectral, Aerial Disease Detection for Myrtle Rust (Austropuccinia psidii) on a Lemon Myrtle Plantation

Rene H. J. Heim; Ian J. Wright; Peter Scarth; Angus J. Carnegie; Dominique Taylor; Jens Oldeland

doi:10.3390/drones3010025

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Multispectral, Aerial Disease Detection for Myrtle Rust (Austropuccinia psidii) on a Lemon Myrtle Plantation

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Multispectral, Aerial Disease Detection for Myrtle Rust (Austropuccinia psidii) on a Lemon Myrtle Plantation

Rene H. J. Heim, Ian J. Wright, Peter Scarth, Angus J. Carnegie, Dominique Taylor and Jens Oldeland

Drones (Basel), Vol.3(1), 25

07/03/2019

DOI: https://doi.org/10.3390/drones3010025

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Abstract

disease detection

drones

plant disease

precision agriculture

random forest

remote sensing

rust fungus

shadow

UAS

Disease management in agriculture often assumes that pathogens are spread homogeneously across crops. In practice, pathogens can manifest in patches. Currently, disease detection is predominantly carried out by human assessors, which can be slow and expensive. A remote sensing approach holds promise. Current satellite sensors are not suitable to spatially resolve individual plants or lack temporal resolution to monitor pathogenesis. Here, we used multispectral imaging and unmanned aerial systems (UAS) to explore whether myrtle rust (Austropuccinia psidii) could be detected on a lemon myrtle (Backhousia citriodora) plantation. Multispectral aerial imagery was collected from fungicide treated and untreated tree canopies, the fungicide being used to control myrtle rust. Spectral vegetation indices and single spectral bands were used to train a random forest classifier. Treated and untreated trees could be classified with high accuracy (95%). Important predictors for the classifier were the near-infrared (NIR) and red edge (RE) spectral band. Taking some limitations into account, that are discussedherein, our work suggests potential for mapping myrtle rust-related symptoms from aerial multispectral images. Similar studies could focus on pinpointing disease hotspots to adjust management strategies and to feed epidemiological models.

Details

Title: Multispectral, Aerial Disease Detection for Myrtle Rust (Austropuccinia psidii) on a Lemon Myrtle Plantation
Creators: Rene H. J. Heim - Universität Hamburg
Ian J. Wright - Macquarie University
Peter Scarth - University of Queensland
Angus J. Carnegie - NSW Department of Primary Industries
Dominique Taylor - Occupational Hygiene, Environment and Chemistry Centre (Redbank, QLD)
Jens Oldeland - Universität Hamburg
Publication Details: Drones (Basel), Vol.3(1), 25
Publisher: Mdpi
Number of pages: 14
Grant note: Macquarie University Research Excellence Scholarship
Identifiers: 991013176791302368
Copyright: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Academic Unit: Faculty of Science and Engineering
Language: English
Resource Type: Journal article

Multispectral, Aerial Disease Detection for Myrtle Rust (Austropuccinia psidii) on a Lemon Myrtle Plantation

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