. Bulletin of the Department of Agriculture. Agriculture. iul. 903, U. S. Dept. of Agricuitu. The Grape Phylloxera in California. Phylloxera viti/oliac: Fig. L—Phylloxera nodosities shown on Zinfandel grapevine: a, Nodosities on terminal rootlets; 6, nodosity showing Phylloxera feeding; c, adult louse; d, molted skin of same. Fig. 2.—Phylloxera tuberosities on smaller root: a, Infested portion of root; 6, normal portion of root. Fig. 3.—Section of grapevine root showing adult louse with eggs in situ. Fig. 4.—Sections of root infested: a, Nev ly formed tuber- osity; b, advanced stage of tu
. Bulletin of the Department of Agriculture. Agriculture. iul. 903, U. S. Dept. of Agricuitu. The Grape Phylloxera in California. Phylloxera viti/oliac: Fig. L—Phylloxera nodosities shown on Zinfandel grapevine: a, Nodosities on terminal rootlets; 6, nodosity showing Phylloxera feeding; c, adult louse; d, molted skin of same. Fig. 2.—Phylloxera tuberosities on smaller root: a, Infested portion of root; 6, normal portion of root. Fig. 3.—Section of grapevine root showing adult louse with eggs in situ. Fig. 4.—Sections of root infested: a, Nev ly formed tuber- osity; b, advanced stage of tuberosity; c, side view of older form of tuberosity; d, tuber- osity causing the cracked condition of bark; c, yoimg colony of insects as found on 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 Department : Supt. of Docs. , Govt. Print. Off.
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