The citrus thrips is a small insect pest that causes some cosmetic damage, but seldom causes yield reduction, tree kills, or lower the nutritional value or eating quality of citrus fruits. In California however, economic and marketing factors have prompted the massive, unnecessary overuse of insecticides to kill this pest. (Author/MA)

Presented are units prepared by the participants of Arizona's Migrant Teacher Institutes which were organized to train participants in the implementation of individualized instruction. Part I describes what a learning center is, how to begin and evaluate learning centers, and the distinguishing features between a teaching unit and a resource unit.…