The Agronimic Services team at Mid Valley Ag has a diverse background in Agronomy, Horticulture and Viticulture. The focus of the team is to assist the Pest Control and Certified Crop Advisors of Mid Valley Ag and their clients in all aspects of crop production from site evaluations for new plantings, fertility and crop protection recommendations. The Agronomic Services team can help customers stay updated on local production and sustainability practices. Additional activities include research and evaluation of new fertility and crop protection products before they are brought to commercial sales as well as providing nutrient management plans, soil and leaf lab analysis and water quality assessments for our customers. The Agronomic Services team works closely with the Extension and Research staff from the University of California in investigating diseases, insects or weed problems.


16401 E. Highway 26
P.O. BOX 593
Linden, CA. 95236
Phone: 209-931-7600
Fax: 209-931-0747
Admin Fax: 209-931-7666

Technical Services

Allan James, Ph.D. | Manager/Agronomist
Education and Experience:
B.S. Iowa State University, Agronomy 1962, B.S. Iowa State University, Crop Protection 1963, Ph.D. Iowa State University, Plant Physiology 1968
Stan Grant | Viticulturalist
Crop Specialties:
Wine Grapes
Education and Experience:
B.S., Geography, CSU-Hayward & M.S., Soil Science, Soil fertility emphasis, U.C. Davis. ARCPACS Certified Soil Scientist & Horticulturist (No. 02341). Over 20 years professional viticulture and soil science experience. Authored 15 articles and many more presentations. For more information, please refer to Progressive Viticulture
Ben Duesterhaus | Resource Agronomist
Education and Experience:
B.S. in Agronomy and MS in Agricultural Seed Science from Texas Tech University, Previously, he has worked in the cotton seed industry in Texas and Arizona for 7 years before moving to California in 2007 as a Technical Service Representative for BASF in Northern California and Hawaii.
Tracy Miller, CCA, PCA | Staff Agronomist
Crop specialties:
Almonds, Walnuts, Cherries, Stone Fruit
Education and Experience:
A.S. Modesto Junior College, Ag Economics, 1995 | B.S. CSU-Fresno, Agricultural Business and Minor in Plant Science/Plant Health, 1998 | California Pest Control Advisor, 1998 | Certified Crop Advisor, 2000

Previously worked as a retail / independent PCA since 1998 before joining the Technical Services Team at Mid Valley Ag in 2014. Key role is to help support the sales staff through problem-solving, new research, and development of sound pest and agronomic programs. Key interests include IPM, soil and plant nutrition, foliar nutrition, plant growth regulators, and irrigation water quality.
Jeff Severson
Julianna Kaiser