The damage caused by many pests can often be tolerated in a school garden. Some pests can be controlled without chemicals by washing plants with a forceful spray of water, hand picking and destroying the pests, or by using barriers.
Each of the following sections on Arthropod, Mollusks, Vertebrate pests, and their Natural Enemies have a few photos of the more common garden pests. All of the photos and information are from the UC IPM website. The website has detailed information on these pests and many more. The information on the IPM website includes additional photos, Pest Identification, Life Cycle, Damage Caused by Pest, Management of Pest, and in many cases a Pest Note that can be printed out. Click this link http://www.ipm.ucdavis.edu/PMG/selectnewpest.landscape.html to go to the UC IPM Pest Index.