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George Koumbarakis, graduate student in irrigation, University of California, Dauis, at the time the following study was made, assisted in the work.

A high early yield of marketable fruit was the goal achieved in an experiment in the breeding of hybrid tomatoes that started in 1947.

An outbreak of Oriental fruit moth— not Oriental fruit fly—caused appreciable crop damage in a small number of peach orchards near Kingsburg during the harvest of 1954. This was the first damaging flare-up of Oriental fruit moth —OFM—in the main peach belt of California.

Peach powdery mildew—a fungus disease incited by Sphaerotheca pannosa (Wallr.) Lev.—attacks leaves, twigs, and fruit of peach trees.

The citrus replant problem varies greatly in severity in different soils and areas. Part of that variation appears to be related to the rootstock originally grown on the soil and the nature of the rootstock used for replanting.

Concentrations of sulfur dioxide—an important plant-damaging constituent of the atmosphere—vary from 0.01 part per million—ppm—to 0.24 ppm, and average about 0.06 ppm in the south coastal plain of California.

Studies of tilled and nontilled citrus and avocado orchards show manure to be efficient in supplying nitrogen to tilled soil.