It's not just Florida and California that are dealing with Huanglongbing in citrus, IT has slowly snuck up on the Mediterranean region, as well. The European Union is trying to deal with this on a regional basis. Read what Life Vida for Citrus is trying to accomplish  My question is why it has taken so long for the disease to spread to this region.  That knowledge may lead to some type of way of managing this disease.

LIFE Vida for Citrus es un proyecto europeo que nace con el propósito de proteger al sector de los cítricos desarrollando plantas resistentes a la enfermedad, y con la idea de implantar prácticas culturales respetuosas con el medio ambiente que limiten el desarrollo del vector transmisor de la enfermedad y que contribuyan a reducir la huella del carbono y del cambio climático.

LIFE Vida for Citrus is a European project born with the purpose of protecting the citrus sector by developing disease-resistant plants, and with the idea of implementing environmentally friendly cultural practices that limit the development of the disease-transmitting vector and that contribute to reducing the carbon footprint and climate change.

And the potential impact on Seville's legendary marmalade industry.

Seville's orange trees, which fill the city with their fragrance in spring, are under threat from citrus greening disease. Photograph: jmeyersforeman/Alamy