Fast and effective monitoring and surveillance techniques are crucial for the swift implementation of control methods to prevent the spread of Huanglongbing, a devastating citrus disease, and its invasive psyllid vector, Asian citrus psyllid, Diaphorina citri , into South Africa, as well as to control the native vector, African citrus triozid, Trioza erytreae . Monitoring for citrus psyllid pests can be improved by using semio...