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Effects of Herbicides on Red Pine Nursery Stock

  • C. H. Winget (a1), T. T. Kozlowski (a1) and J. E. Kuntz (a2)

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.

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References

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Effects of Herbicides on Red Pine Nursery Stock

  • C. H. Winget (a1), T. T. Kozlowski (a1) and J. E. Kuntz (a2)

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