Strawberry Deficiency Symptoms: A Visual and Plant Analysis Guide to Fertilization

Plant Physiologist, Department of Soils and Plant Nutrition, University of California Berkeley.

His lifelong research remained focused on how macro and micro mineral nutrients, under different light and temperature regimes, influence plant growth, which in turn was expressed in the yield, quality and time of maturity of agricultural crops. Because of his experimental needs and expertise, he had a strong interest in and influence on the construction and use of controlled-temperature greenhouses, plant-growth chambers and phytotrons, and on the design and construction of the Oxford Research Unit greenhouses on the Berkeley campus. He was one of the pioneers who laid the foundations for plant analysis as a diagnostic procedure for efficient mineral nutrition of plants.

He helped develop the concept of critical nutrient deficiency values in plants, and, using a combination of growth chambers, water culture and field plots, experimentally determined these critical values for many of California's important crops.

Staff Research Associate, Department of Soils and Plant Nutrition, University of California Berkeley

University of California, Berkeley Entomologist William Allen's work helped the California strawberry industry become the nation’s primary strawberry producer. Allen’s main scientific contributions were identifying spider mites, lygus bugs, root weevils, and aphids as the most economically significant strawberry insect pests.

Allen was a pioneer in the then-emerging field of integrated pest management to help the industry concentrate on the economically significant insects. As a result, the industry began using pesticide more judiciously and slowed the rate at which insects developed resistance to the chemicals.