1. UC IPM
Leaf yellowing in about one-quarter of an orange tree canopy due to citrus greening or Huanglongbing, caused by a phloem-inhabiting bacterium spread by the Asian citrus psyllid, <I>Diaphorina citri.</I>.
Leaf yellowing in about one-quarter of an orange tree canopy due to citrus greening or Huanglongbing, caused by a phloem-inhabiting bacterium spread by the Asian citrus psyllid, Diaphorina citri..
Credit: Michael E. Rogers