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Primarily tests of a optoelectronic in‐canopy sensor for evaluation of vertical disease infection in cereals
Author(s) -
Dammer KarlHeinz,
Schirrmann Michael
Publication year - 2022
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.6623
Subject(s) - canopy , biology , disease , environmental science , materials science , optoelectronics , agronomy , remote sensing , medicine , botany , geography , pathology
BACKGROUND Health scouting of crops by satellite, airplanes, unmanned aerial (UAV) and ground vehicles can only evaluate the crop from above. The visible leaves may show no disease symptoms, but lower, older leaves not visible from above can do. A mobile in‐canopy sensor was developed, carried by a tractor to detect diseases in cereal crops. Photodiodes measure the reflected light in the red and infrared wavelength range at 10 different vertical heights in lateral directions. RESULTS Significant differences occurred in the vegetation index NDVI of sensor levels operated inside and near the winter wheat canopy between infected (stripe rust: 2018, 2019 / leaf rust: 2020) and control plots. The differences were not significant at those sensor levels operated far above the canopy. CONCLUSIONS Lateral reflectance measurements inside the crop canopy are able to distinguish between disease‐infected and healthy crops. In future mobile in‐canopy scouting could be an extension to the common above‐canopy scouting praxis for making spraying decisions by the farmer or decision support systems. © 2021 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.