The University of California has published a 365 page book on alfalfa production written by UC Extension specialists, farm advisors, and faculty.
The book costs $65. It can be purchased on-line or is available at the UC Cooperative Extension office in Tulare. Irrigated Alfalfa Management for Mediterranean and Desert Zones (UC ANR publication 3512) was written for the Central Valley and California desert alfalfa production areas and is intended for growers, pest control advisors, and allied industry.
There are color photographs of disease symptoms and insect pests, including a diagnostic key. The 24 chapters cover alfalfa production from start to finish, from selecting varieties through harvest to marketing and economics. There are chapters on organic alfalfa, grazing, and manure application.
The chapters can be viewed on the internet at alfalfa.ucdavis.edu/IrrigatedAlfalfa/.