It had to do with trying to find predators that would get after and kill off red scale, black scale and other pests. These were the people, who through their publications and travels, got the Citrus Experiment Station known around the world. The citrus growers marketing organization published a monthly magazine known as the Citrograph, and that Citrograph began to be circulated to a lot of citrus areas, in other parts of the world-South Africa, Australia, Italy, etc. I was amazed when I visited South Africa in 1957, and one of the citrus growers hauled out his copies of the Citrograph to show me articles that I had written, but other staff of CES had written, too. It was the research on citrus that gained us the reputation around the world.
Citrus is grown in a belt about thirty degrees north and south of the equator.
Citrus, according to some, is the third most important fruit crop in the world. Apples are first and bananas are second. I mean oranges, lemons, grapefruit, mandarins and some others. It was worse on some soils than others, but it was present almost everywhere in the citrus industry. The discovery of what it was came out of research by a horticulturist from Berkeley.