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Effects of Herbicides on Red Pine Nursery Stock

Published online by Cambridge University Press:  12 June 2017

C. H. Winget ,
T. T. Kozlowski  and
J. E. Kuntz
C. H. Winget
Affiliation:
Department of Forestry, University of Wisconsin
T. T. Kozlowski
Affiliation:
Department of Forestry, University of Wisconsin
J. E. Kuntz
Affiliation:
Departments of Plant Pathology and Forestry, University of Wisconsin
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Abstract

Triazines were applied to 1–0 stock (1-year-old, not transplanted) on sandy soils at ½, 1, and 2 lb/A and to 2–0 stock at 1, 2, and 4 lb/A. Simetone (2-methoxy-4,6-bis(ethylamino)-s-triazine) had no apparent effects on weeds or seedlings. All rates of 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine) and the higher rates of 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine) and 2-chloro-4-isopropylamino-6-methyl-amino-s-triazine (G–30026) controlled weeds but seriously injured 1–0 stock. All rates of 2-chloro-4,6-bis(isopropylamino)-s-triazine (propazine) controlled weeds without injuring seedlings. Atrazine and G–30026 at 4 lb/A injured 2–0 stock. Simazine at 2 and 4 lb/A and atrazine at 1 and 2 lb/A did not affect 2–1 transplants. CDAA (2-chloro-N,N-diallylacetamide) and CDEC (2-chloroallyl diethyldithiocarbamate) at 4 and 8 lb/A did not affect weeds or 1–0 and 2–0 stock. At 16 and 32 lb/A, CDAA was highly toxic to weeds and stock, while CDEC controlled weeds with only a temporary effect on seedlings at 32 lb/A. CDAA and CDEC at 4 and 8 lb/A did not affect weeds or 2–1 transplants. N-1-naphthylphthalamic acid (NPA) and sodium 2,4-dichlorophenoxyethyl sulfate (sesone) at 1.8 and 3.6 lb/A did not control weeds. Sesone injured 1–0 and 2–0, but not 2–1 red pine. Ethyl N,N-di-n-propylthiolcarbamate (EPTC) at 3 and 6 lb/A controlled weeds without injuring 1–0, 2–0, or 2–1 red pine. These experiments emphasized that many herbicides too toxic for nursery use may be useful in site preparation for planting or in plantation release.

Type
Research Article
Information
Weeds , Volume 11 , Issue 2 , April 1963 , pp. 87 - 90
Copyright
Copyright © 1963 Weed Science Society of America 

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References

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