Studies have been done by Fundecitrus that found the first four stages of orange tree shoot development are the most attractive ones to Huanglongbing (HLB) spreading psyllids. These stages, (V1 to V4) are critical to take care of in a young orange trees life, insecticides should be used to keep the pesky psyllids away. “This is because the insecticides applied to the leaves do not have a systemic action, that is, they do not move within the plant and do not follow the growth of the shoots,” said Juan Arenas, the postdoctoral fellow responsible for the work.
