. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fumigation of Citrus Plants With Hydrocyanic Acid. A, B, Fumigation injury fo foliage at point of infestation with purple scale (Lepidosaphes beckii). The injury appeared most prominent on the side of the leaf opposite the in- festation. A, Upper side of leaf, showing purple scale. B, Lower side of same leaf, showing collapsed tissue opposite scale infestation. C, An immature Valencia orange injured hy exposure to sunshine following fumigation. The uninjured area was shaded by leaves. D, Twig from a fumigated tree, sho
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fumigation of Citrus Plants With Hydrocyanic Acid. A, B, Fumigation injury fo foliage at point of infestation with purple scale (Lepidosaphes beckii). The injury appeared most prominent on the side of the leaf opposite the in- festation. A, Upper side of leaf, showing purple scale. B, Lower side of same leaf, showing collapsed tissue opposite scale infestation. C, An immature Valencia orange injured hy exposure to sunshine following fumigation. The uninjured area was shaded by leaves. D, Twig from a fumigated tree, showing how the leaves are ab- scissed at the base of the blade, leaving the petioles clinging to the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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