Four parasites of the California red scale—Aphytis chrysomphali (Mercet); Aphytis lingnanensis Compere, formerly known as Aphytis “A”; Prospaltella perniciosi Tower, Oriental Strain; and Comperiella bifasciata Comp., Chinese strain—are established in certain citrus areas in southern California.

Louis Dawsen, E. J. Dietrick, Lloyd Andres, Garn Stanworth, Wayne Melander, Ken Ara-kawa, and Robert Small, of the technical staff, University of California, Riverside; J. R. La-Follette, of the California Fruit Growers Exchange; Arthur L. Chandler, of the Mutual Orange Distributors; and the County Agricultural Commissioners and their staffs, of Los Angeles, Orange, Riverside, Santa Barbara, San Bernardino, and San Diego counties, co-operated in the studies reported here.

The above progress report is based on Research Project No. 1493.