Abstract
7. An abrupt increase in effectiveness took place between October 6 and November 4. The increase in effectiveness in November appears to have been associated with an increase in soil moisture and a decrease in air temperature. The trees remained sensitive throughout the winter and spring months. ILITERATURB CITED AREND, J. L. AND L. L. COULTE. 1953. Chemical frill girdling for pine release in lower Michigan. Down to Earth. 8 (4): 2-4. EMRICK, WALTE E. 1953. An easy way to kill your bull (digger) pines. Univ. California Ext. Service Leaflet (Madera County): 1-9. EMRICK, W. E. AND 0. A. LEONARD. 1954. Delayed kill of interior live oak by fall treatment with 2,4-D and 2,4,5-T. Jour. Range Mangt. 7: 75-76. GODDARD, RAY E. 1954. Killing small undesirable hardwoods by use of the Cornell tool. Down to Earth 10 (2): 5. HARRIS, G. H. 1926. The activity of apple and filbert roots especially during the winter months. Proe. Amer. Soc. Hort. Sci. 23: 414-422. LEONARD, 0. A. 1952. Result of a cutsurface experiment on interior live oak. Research Rept., 13th Western Weed Control Conference: 53-54. MCCUILrY, W. G. AND R. A. DARROW. 1952. Control of post and blackjack oaks with growth-regulator herbicides. Proc. Fifth South. Weed Conf. 137140.
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