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Herbicides and seed production by two perennial ryegrass cultivars grown in weed‐free conditions
Author(s) -
OSWALD A. K.
Publication year - 1981
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1981.tb01539.x
Subject(s) - perennial plant , germination , agronomy , weed , biology , cultivar , yield (engineering) , crop , clopyralid , weed control , horticulture , materials science , metallurgy
The effects of five herbicides on seed yield and viability of perennial ryegrass cv. S24 were tested at two sites. Benzoylprop‐ethyl, chlorfenpropmethyl, difenzoquat, ethofumesate and flam‐prop‐isopropyl were safe to use at doses recommended for use in other crops. When applied at three times the recommended dose, only difenzoquat reduced the yield and germination of seed and benzoylprop‐ethyl reduced seed germination. The recommended doses of difenzoquat and ethofumesate were safe when applied on cv. Barlenna at different growth stages. Difenzoquat reduced seed yield only after three times the recommended dose was applied to tillered plants. Ethofumesate, even at three times the recommended dose, did not affect seed yield but plant numbers were reduced by early treatment. The results suggest that the herbicides tested may be safe to use in perennial ryegrass seed crops at the recommended doses but more work is needed on the safety of difenzoquat in relation to crop growth stage.