The pilot project conducted by IPSP-CNR, in collaboration with the University of Bari and “Centro di Ricerca, Sperimentazione e Formazione in Agricoltura” of Locorotondo, aimed at “a better understanding of the susceptibility of some important perennial crop species to the Apulian strain of X. fastidiosa (denoted CoDiRO), by testing the susceptibility of major Mediterranean crops such as grapes, citrus, peach and plum, but also of forest species such as oak or other temperate trees. [...] Results from needle inoculations revealed the high susceptibility of olives, oleander and Polygala myrtifolia (high rate of infected plants) to the CoDiRO strain. From these hosts, the bacterium was successfully re-isolated and symptoms resembling those associated to X. fastidiosa (leaf scorching, die back, discoloration) were recorded during the experiments. Conversely, the experimental plants for the remaining species (citrus, grapes and Q. ilex) did not support bacterial infections nor developed symptoms” (excerpt from the EFSA scientific Report). Therefore, Giuseppe Stancanelli, head of EFSA’s Animal and Plant Health Unit, stated: “These findings confirm that the CoDiRO strain of X. fastidiosa causes olive dieback”.