Observations on the Biology and Control of the Treehopper Heliria Praealta (Fowler) in Orchards of the Pacific Northwest

by Edgar John Udine, Edmund Bryan Lambert, Frank Leslie Duley, Joseph Benjamin Shepherd, M. A. Yothers, Robert Hale Nelson, Russell Rutherford Whitten, Victor Leo Stedronsky, William Alvin Douglas, Arvid John Johnson, Carroll Clayton Cassil, Latimer Ludwig Kelly, Paul B. Allen, Thompson Elwyn Woodward, Thomas Laffin Baggette