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Home → Publications → Tree Planters' Notes → Tree Planters' Notes Volume 18, Number 3 (1967) → Zinc Rodent Repellents also Improve Root Growth of Douglas-Fir Seedlings, But Higher Levels Cause Mortality

Zinc Rodent Repellents also Improve Root Growth of Douglas-Fir Seedlings, But Higher Levels Cause Mortality

The impact of wildlife damage on forest plantations in the Pacific Northwest has stimulated great interest and research in control methods. At present, applying a repellent spray in the nursery before lifting trees is one method of controlling deer and hare damage on newly planted seedlings. This protects the seedlings in the field during the first dormant season. The usual treatment is to spray the seedlings with a 10-percent TMTD 2 repellent utilizing Rhoplex AC-33 3 as an adhesive. Other materials produced by several chemical firms are being evaluated for repellent characteristics in controlled pen studies conducted by the Olympia Field Station of the Bureau of Sports Fisheries and Wildlife, U.S. Department of Interior. One such material, Z.I.P.4 animal repellent, has proved as effective as TMTD. Z.I.P. ranked higher in 13 of 14 completed enclosure tests as a deer repellent and ranked better than TMTD in five of seven completed tests on hares (3). There was, however, no significant difference between Z.I.P. and TMTD in these tests.


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Author(s): Harry W. Anderson

Publication: Tree Planters' Notes - Volume 18, Number 3 (1967)

Volume: 18

Number: 3