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russell r whitten
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The internal application of chemicals to kill elm trees and prevent bark-beetle attack
Russell R. Whitten · U.S. Dept. of Agriculture
12 sayfa · 1941
Control / Bark beetles / Elm / Diseases and pests
Toxic and repellent sprays for the control of elm bark beetles
Russell R. Whitten · U.S. Dept. of Agriculture
12 sayfa · 1942
Control / Dutch elm disease / Elm / Diseases and pests
The Dutch elm disease and its control
Russell R. Whitten · U.S. Dept. of Agriculture
12 sayfa · 1958
Control / Dutch elm disease / Elm / Diseases and pests