
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/
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
Elegant Remodelers
http://www.elegantremodelers.com/HomeandHearth.html
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."
Google Directory
http://directory.google.com/Top/Science/Agriculture/Forestry/Pests_and_Diseases/
Google Directory
http://www.google.com/Top/Science/Biology/Botany/Plant_Pathology/Publications/Extension_Publications/
"Description and control of some common tree diseases."
Illinois Virtual Forest
http://ilvirtualforest.nres.uiuc.edu/id/diseases.htm
Jersey Shore Area School District
http://www2.jsasd.k12.pa.us/mhopple/nature/Eforestry.htm
"Focus on Plant Diseases"
Knowledge.com
http://directory.knowledge.com/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."
MavicaNet
http://www.mavicanet.com/directory/eng/8529.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."
Open Directory
http://dmoz.org/Science/Agriculture/Forestry/Pests_and_Diseases/
Plant Pathology
http://www.agpowermicro.org/ag323/lessons/5_1.htm
ScienceDaily.org
http://www.sciencedaily.org/directory/Science/Agriculture/Forestry/PestsandDiseases/
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 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 Illinois Horticulture Club
http://w3.aces.uiuc.edu/Clubs/Hort/hortlinks.html
University of Illinois Integrated Pest Management
http://www.ipm.uiuc.edu/diseases.html
WebMesh
http://www.webmesh.co.uk/treelinks.htm