A recent severe outbreak of Xylella fastidiosa associated with 'olive quick decline syndrome' (OQDS) was reported in Apulia (Southern Italy). In this study an on-site real-time loop-mediated isothermal amplification (real-time LAMP) was developed for detecting X. fastidiosa in host plants and insects. A marked simplification of the DNA extraction procedure was obtained by heating the samples in a portable Smart-Dart device and using an optimized enhancer reaction buffer. The connection to a tablet or Smartphone allowed to visualize the results of the reaction in real time. Compared to PCR and ELISA, with which it showed comparable results in terms of sensitivity and reliability in the X. fastidiosa detection, this simplified real-time LAMP procedure proved to be "user friendly", displaying the advantages to be an on-site detection method of easy handling, rapid execution and low cost.