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To prevent the spread of diseases in humans, animals or plants, determining whether potential vectors are infected is crucial. For example, early detection of the citrus disease Huanglongbing, which has been a scourge on the citrus industries around the world, is a critical need. This vector-borne disease is transmitted by  Diaphorina citri , the Asian citrus psyllid, which carries the putative bacterial phytopathogen,  Candidatus  Liberibacter asiaticus ( C Las). In this investigation, we introduced Laser-Induced Breakdown Spectroscopy (LIBS) to reveal key biochemical differences between  C Las-infected and non-infected psyllids. The emission spectra captured from laser ablation of  C Las-infected and healthy psyllids were processed through the principal component analysis (PCA) method and compared. Thirteen peaks from seven different elements were detected in  D .  citri . The  t -test showed that  C Las-infected  D .  citri  were deficients in zinc, iron, copper, magnesium, calcium, and nitrogen. The PCA showed that LIBS can successfully differentiate between  C Las-infected and healthy  D .  citri  by comparing their elemental profile. In this work, we demonstrated a method that allows for a fast and precise compositional microanalysis of an insect vector which can contribute to the early detection of citrus huanglongbing

Laser-induced breakdown spectroscopy (LIBS) as a novel technique for detecting bacterial infection in insects