Insect Fact Sheets  (Tree insect information)

Plant Disease Fact Sheets   (Tree disease information)

Woody Ornamental Inset, Mite, and Disease Management, Pennsylvania State University

Penn State Department of Horticulture

PLANTS National Database   (Tree availability resource)

Poisonous Plants Information Database, Cornell University

Tree Fruit Production Guide

Virtual Foliage   (Tree identification)

University of Connecticut Plant Database  (Tree identification & resource info)

International Society of Arboriculture  (Arborist organization)

TCIA Careers in Arboriculture

Tree Care Industry Association  (Arborist company organization)

PA Urban Forestry Council  (Pennsylvania community trees organization)

Ornamental and Shade Trees, Pesticide Applicator Guide

Pesticide Applicator Recertification Credit Information

Pesticide Labels and MSDS Sheets