Google Web Directory
http://directory.google.com/Top/Science/Biology/Botany/Plant_Pathology/Publications/Extension_Publications/
Looksmart.com
http://rr.looksmart.com/eus1/eus317837/eus317921/eus53672/eus54102/eus53675/eus1136810/r
Open Directory Project
http://dmoz.org/Science/Biology/Botany/Plant_Pathology/Publications/Extension_Publications/
Alexa
http://www.alexa.com/browse/general/?&CategoryID=190433&mode=general&Start=1&SortBy=Popularity
"Information by host plant on diseases and damages affecting trees and perennial flowers from the University of Illinois Extension."
AllCommunity.com
http://search.allcommunity.com/Science/Agriculture/Forestry/Forest_Insects_and_Diseases/
Bortone Web Directory
http://www.bortonevivai.it/public/dwodp/odp.php?c=/Science/Agriculture/Forestry/Pests_and_Diseases/
Britannica Encyclopedia - Crown Gall - Websites - External Websites
http://www.britannica.com/EBchecked/topic/144469/crown-gall/144469websites/External-Web-sites
Chicago Botanic Garden Plant Information
http://www.chicago-botanic.org/plantinfo/PlantInfoLinks.html
"Focus on Plant Diseases"
Do It Yourself
http://forum.doityourself.com/showthread.php?t=265319
Everything Bio
http://www.everythingbio.com/links/index.php?c=/Science/Agriculture/Forestry/Pests_and_Diseases/
"Information by host plant on diseases and damages affecting trees and perennial flowers from the University of Illinois Extension."
Excite UK
http://www.excite.co.uk/directory/Science/Agriculture/Forestry/Pests_and_Diseases
"Information by host plant on diseases and damages affecting trees and perennial flowers from the University of Illinois Extension."
Farm Industry News - Precision ag on the cheap? Ideas for farmer “hackers”
http://farmindustrynews.com/news/Ideas-farmer-hackers-092304/
Google Directory
http://www.google.com/Top/Science/Biology/Botany/Plant_Pathology/Publications/Extension_Publications/
"Description and control of some common tree diseases."
Google Directory
http://directory.google.com/Top/Science/Agriculture/Forestry/Pests_and_Diseases/
Helpful Gardener - Gardening Forum - Yellowing Leaves and Brown Spots - Comments
http://www.helpfulgardener.com/phpBB2/viewtopic.php?t=2921
Iowa State University - Integrated Pest Management - Pest List for Diseases On Ornamentals in Iowa
http://www.ipm.iastate.edu/ipm/schoolipm/sites/default/files/Host_Disease_Pest_Guide_List.pdf
Iowa State University Extension - Horticulture & Home Pest News - Plant and Insect Diagnostic Clinic
http://www.ipm.iastate.edu/ipm/hortnews/2007/8-22/Update.html
Med Bio World
http://www.medbioworld.com/cgi-bin/displaycontents.cgi?table=bio
MedBioWorld
http://www.sciencekomm.at/cgi-bin/displaycontents.cgi?table=bio
NC State University
http://www.cals.ncsu.edu/course/pp318/lnx.htm
"This page ,titled "Chlorosis", describes the causal agents and hosts, symptoms, and common methods of treatment for chlorosis. It also has links to some other common disease topics."
North Carolina State University Cooperative Extension - Insects to Watch For
http://buncombe.ces.ncsu.edu/content/insects
Open Directory
http://dmoz.org/Science/Agriculture/Forestry/Pests_and_Diseases/
Penn State - Entomology - Insect Advise - Christmas Trees
http://ctrees.cas.psu.edu/related_links.htm
Penn State - Entomology - Insect Advise - General Pest Information
http://ento.psu.edu/extension/christmas-trees/related-links/pests
Pest and Disease Image Library - Black Know of Stone Fruits - Web links
http://www.padil.gov.au/viewPest.aspx?id=463
Plant Pathology
http://www.agpowermicro.org/ag323/lessons/5_1.htm
Purdue Extension - Plant and Pest Diagnostic Laboratory - The Leaves on My Trees are Turning Yellow
http://www.ppdl.purdue.edu/ppdl/hot04/7-22.html
ScienceDaily.org
http://www.sciencedaily.org/directory/Science/Agriculture/Forestry/PestsandDiseases/
The Morton Arboretum - Plant Health Care Report - This Week’s Sightings
http://www.mortonarb.org/images/stories/pdf/plant_healthcare_reports/071108_issue_13.pdf
"Good web site"
The UK Tree Care Mailing List
http://www.oak-wood.co.uk/forum/treecare/posts/13767.php
Tiscali Web Directory
http://directory.tiscali.it/Science/Agriculture/Forestry/Forest_Insects_and_Diseases
UBC Botanical Garden & Centre for Plant Research - Forum - Feneral Gardening Questions and Answer
http://www.ubcbotanicalgarden.org/forums/showthread.php?t=7436
UBC Botanical Garden and Centre for Plant Research
http://www.ubcbotanicalgarden.org/forums/showthread.php?t=14968
UKnetguide answer bank
http://www.theanswerbank.co.uk/Home_and_Garden/Question88477.html
University of Idaho Extension - Trees - Diagnosing Plant Problems - Cytospora
http://www.extension.uidaho.edu/idahogardens/tsv/dpp.htm
University of Illinois Integrated Pest Management
http://www.ipm.uiuc.edu/diseases.html
University of Maryland Cooperative Extension - Environmental Horticulture - References
http://environmentalhorticulture.umd.edu/Perennials2/Yarrow.pdf
UNL Extension - Lancaster County - Horticulture: Your Yard & Garden - Plant Pests
http://lancaster.unl.edu/hort/masterg.shtml
WebMesh
http://www.webmesh.co.uk/treelinks.htm
