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Early remote detection of downy mildew on grape vine by fluorescence methods

Diedrich, Manuel and Kölbl, Christoph and Ellingen, Elias and Duschek, Frank and Selim, Moustafa and Berkelmann-Löhnertz, Beate (2022) Early remote detection of downy mildew on grape vine by fluorescence methods. XIII. International Symposium on Grapevine Breeding and Genetics 2022, 10.07. – 17.07.2022, Landau. (Submitted)

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Abstract

Pathogenic fungi severely threatens the annual yield of grapes in quantity and quality. Therefore, viticulture requires intensive fungicide applications, compared to other crops. Aimed at a reduction of fungicide input, different techniques and combined strategies are applied in viticulture. To successfully reduce losses in yields, early detection techniques are required. In this work we present premeasurements to remotely detect a pathogenic fungus on the leaves of Vitis vinifera (Müller-Thurgau). We were able to detect a leaf infection with Plasmopara viticola (causal agent of downy mildew) on potted vines within the first week after inoculation. Our results could be reproduced over multiple samples and different methods. Fluorescence mapping was used to monitor the blue-green fluorescence and chlorophyll fluorescence behaviour over a wide area of excitation wavelengths. Based on this, spectral data of fluorescence emission was recorded via fluorometric measurements with excitation at different wavelengths in the visible and UV range. Furthermore, we used laser-induced fluorescence (LIF) and hyperspectral imaging to verify our results. Additionally, we combined hyperspectral imaging with LIF. The evaluation was based on the ratio of blue fluorescence to far-red fluorescence (BFRR_UV) and normalized difference vegetation index (NDVI), which represent an established method in many agricultural applications. Eventually, we evaluated the scalability of our methods for long term measurements. Our results form a fundamental approach for the design of a laser-based stand-off detection system for the practical application in vineyards. Such a system can serve as a model technology for early detection of pathogenic diseases and opens a window for early countermeasures. As mildew infection is considered the most damaging disease in European viticulture, these early countermeasures could greatly reduce the environmental and economic cost associated with fungicide application.

Item URL in elib:https://elib.dlr.de/186149/
Document Type:Conference or Workshop Item (Poster)
Title:Early remote detection of downy mildew on grape vine by fluorescence methods
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Diedrich, Manuelmanuel.diedrich (at) dlr.dehttps://orcid.org/0000-0002-7512-6500
Kölbl, ChristophChristoph.Koelbl (at) dlr.dehttps://orcid.org/0000-0001-6518-0012
Ellingen, Eliaselias.ellingen (at) dlr.deUNSPECIFIED
Duschek, FrankFrank.Duschek (at) dlr.deUNSPECIFIED
Selim, MoustafaMoustafa.Selim (at) hs-gm.deUNSPECIFIED
Berkelmann-Löhnertz, BeateBeate.Berkelmann-Loehnertz (at) hs-gm.deUNSPECIFIED
Date:22 July 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Submitted
Keywords:vinolas, remote detection, fluorescence, LIF, hyperspectral imaging, grapevine, pathogenic fungi, downy mildew
Event Title:XIII. International Symposium on Grapevine Breeding and Genetics 2022
Event Location:Landau
Event Type:international Conference
Event Dates:10.07. – 17.07.2022
Organizer:Julius-Kühn Institut
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment
Location: Lampoldshausen
Institutes and Institutions:Institute of Technical Physics > Atmospheric Propagation and Effect
Deposited By: Kölbl, Dr. Christoph
Deposited On:16 May 2022 15:19
Last Modified:27 Jul 2022 03:00

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