High Altitudes Limit The Incidence of Huanglongbing snd Its Vector, Diaphorina Citri, in Citrus Orchards

Abstract Citrus fruit are important crops in many regions of the world and valuable sources carbohydrates, fibre health-promoting compounds. Like other crops, production these fruits is affected by a range pests pathogens that can affect sustainable development citriculture. The most devastating huanglongbing (HLB), bacterial disease caused species liberibacters, spread insect vectors. Currently, there no remedy for HLB, management relies on use disease-free seedlings, rouging diseased trees, pesticides to suppress populations Our studies HLB Indonesia Bhutan have shown citrus grown at higher altitudes (above 1000–1200 m ASL) remain free from main vector disease, psyllid Diaphorina citri, despite climatic conditions being favourable insect. Thus, without polluting agrochemicals may be possible. However, this would dependent HLB-free propagation material, strict control movement trees into areas adoption appropriate agronomic practices pathogens.