http://www.gramarye.u-net.com/Slow/General/Tree/Tpest.html
Tree pests and diseases

http://www.fred.net/sports/410.htm
Controlling pests & diseases in gardens

http://www2.viaweb.com/gardenshop/conpesanddis.html
Controlling Pests and Diseases A gardener's guide to safe, effective controls for insects, diseases, and animal pests

http://www.russellipm.com
Products for the management of home and garden pest effectively and without chemicals

http://www.pestcontrolportal.com
Pest Control search engine and portal site.

http://users.pandora.be/guy.de.kinder/links/plantenziekten.htm
Many weblinks for pest and diseases.