All Issues

Throughout Northern California the codling moth infestation in 1948 was much more serious than that encountered in any recent year. The cause of this is not known although it may have been associated in part with the lateness of the season.

Exploratory tests conducted in the summer of 1948 suggest the possible use of a virus as a means of biological control of the alfalfa caterpillar.

The citricola scale,Coccus pseudo-magnoliarum Green, increased in numbers in 1948 in western Riverside and San Bernardino counties. It disappeared from economic consideration in those areas during the winter of 1933-34 and remained relatively unimportant until 1947 when it began its current build-up.

Biological control of Baker mealybug on pears was studied during 1948 in experimental work carried out in conjunction with the normal spray program.

The recent major freeze caused severe injury to both crop and trees of many subtropical evergreen fruit trees of the State.

California red scale,Aonidiella aur-antii—the most important pest of citrus-is attacked by several natural enemies, principally the golden chalcid, the lindorus ladybird and the twice-stabbed ladybird.

Approximately 300 million pounds of castor beans were imported during each of the past eight years.

Two new strains of Mary Washington asparagus—numbers 499 and 500—have been developed by the Division of Truck Crops and released to growers for trial.

A machine that will thresh parts of a plant, individual plants, or a small number of plants and is particularly adapted to obtaining onion and carrot seed has been developed by the Division of Truck Crops.

Internal parasites—such as stomach worms—in horses can be controlled with phenothiazine administered in repeated small dosages in a routine seasonal treatment program.