A manual of dangerous insects likely to be introduced in the United States through importations Year: 1917 (1910s) Authors: United States. Bureau of Entomology Pierce, W. Dwight (William Dwight), 1881-1967 Subjects: Insects, Injurious and beneficial Publi

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Identifier: manualofdangerou01unit Title: A manual of dangerous insects likely to be introduced in the United States through importations Year: 1917 (1910s) Authors: United States. Bureau of Entomology Pierce, W. Dwight (William Dwight), 1881-1967 Subjects: Insects, Injurious and beneficial Publisher: Washington, Govt. print. off. Contributing Library: The Library of Congress Digitizing Sponsor: Sloan Foundation
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Text Appearing Before Image: ' Text Appearing After Image: a bed Fig. 6.—Apple psylla {Psylla mali): a, Adult; 6, injured twig; c, nymph; d, eggs on shoot. (TheobalOj Distribution: Europe, Central Russia.Theobald, F. V. Insect Pests of Fruit, 1909, p. 153. U S Dept. of Agncultuce, Manual of Dangerous Insects. Plate VI.
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