Manipulation of cover crops may improve biological control of some pests

These studies were made possible by generous funding from the Jessie Noyes Smith Foundation, New York, and the University of California Appropriate Technology Program. Several students provided valuable help in the field and laboratory: John Herr, John Farrell, Javier Trujillo, Jamin Eisenbach, Maia Massion, Eric Engbeck, Debbie Hammel, Cliff Gold, and Octavio Ruiz. The enthusiastic and patient collaboration of Stephen Gliessman, UC Santa Cruz, and farmers Ken Ratzlaff, Sebastopol, and Joe Green, Courtland, is greatly appreciated.