Water Vapor Pressure Deficit in Portugal and Implications for the Development of the Invasive African Citrus Psyllid .

African citrus psyllid ( (Del Guercio)) is a vector insect of the bacterium Liberibacter africanus, the putative causal agent of Huanglongbing, the most devastating citrus disease in the world. The insect was found on the island of Madeira in 1994 and in mainland Portugal in 2015. Present in the north and center of the country, it is a threat to Algarve, the main citrus-producing region.