  Spatio-temporal analysis typically performed in botany and in statistical
physics reveals persistent correlations of olive yields which range depend on
the size of the averaging region. Mapping spatially correlated regions reveals
areas which mimic historical spread of Olea europaea. These yield patterns are
remarkable given the intensive nature of modern agriculture, and cannot be
attributed to weather due to inability of weather variables to predict yields.
Long-range correlations between olive trees may indicate long-range
communications.
