*2.1. Experimental Site*

UAV-based surveys were performed over one hectare of *Actinidia deliciosa* (A. Chev.) CF Liang et AR Ferguson cultivar 'Hayward' in San Giorgio della Richinvelda (Friuli Venezia Giulia, NE Italy, 46.039◦N 12.864◦E). The orchard was 20 years old, grown in a 5 × 5-m T-bar plantation without anti-hail netting, with a micro-irrigation system (micro-sprinkler, 20 mm/hour) and with the following soil properties: 8% gravel, 36% sand, 59% silt, 5% clay and 1.04% organic matter (w/w). The first symptoms of KD were recorded in 2015 after an irrigation pipe broke in the central rows of the orchard. Later in 2016, the disease rapidly spread towards the border of the field, compromising approximately 30% of the field. From 2017 the field was regularly inspected to check the pattern of disease spread. In that year, the disease a ffected almost the entire orchard, compromising approximately 70% of the field, and by 2018 only a few plant rows on the eastern boundary were still apparently healthy. At the end of 2018, the field was definitively explanted. From the first appearance of the disease, the orchard was irrigated by following the usual agronomic practices and avoiding both drought stress and excessive irrigation.
