If you click on the tabs at the left you will find various training materials (powerpoint) and online courses developed by Beth Grafton-Cardwell. These materials are designed for you to improve your knowledge of citrus IPM.
Other essential Citrus IPM references by the University of California are:
UC IPM guidelines for citrus that provides pest and natural enemy sampling methods and control methods. http://www.ipm.ucdavis.edu/PMG/selectnewpest.citrus.html.
Integrated Pest Management for Citrus Manual (new 2012 edition) that provides photos and descriptions of all of the key pests and diseases of California citrus. http://anrcatalog.ucdavis.edu/IntegratedPestManagement/3303.aspx