ahs.org | Gardening Connections Links / Resources Specific Gardening Subjects
VIRTUAL PLANT & PEST DIAGNOSTIC LABORATORY
Provides the latest pest & disease information, FAQs, newsletters, reference links & other information. All from the Purdue Plant & Pest Diagnostic Laboratory.
INTERNATIONAL SOCIETY OF ARBOCULTURE
A collaboration of the ISA and the Univ. of Illinois Extension Service. Info on arboriculture and plant care along with illustrated instructions on tree pruning and tree care by Dr. Alex Shigo.