University extension online
University extension online sites may be helpful and can be identified by searching topics of interest followed by .edu
Plant Disease Management Handbook
Descriptions of plant disease to make diagnoses, determine causation and recommend treatment or remediation options
Insect Management Handbook
Great Plant Picks (GPP) is the primary educational program of the Elisabeth C. Miller Botanical Garden which debuted in 2001 with the first recommendations for a comprehensive palette of outstanding plants for the maritime Pacific Northwest.