"For permanent rat control, make all buildings rat proof. For temporary control, use either red squill or barium carbonate in meat, cereal fruit or vegetable baits. Supplement baiting with trapping and with fumigation using either calcium cyanide or car exhaust gas. Observe proper precautions in handling, storage and use of poisons."--P, [108].

The USDA pear psylla control lantern slide collection contains color lantern slides produced by U.S. Department of Agriculture Bureau of Entomology and Plant Quarantine, Fruit Insect Investigations, Pear Psylla Control. There are 13 slides of pears infected with pear psylla, 3 slides of maps, and a sllide of a chart of spraying operations in counties of Washington, Idaho, and Oregon in 1941.