USDA pear psylla control lantern slide collection 1941 | United States Department of Agriculture pear psylla control lantern slide collection
1941
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.
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