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THE ABILITY OF PARAQUAT, DALAPON AND AMITROLE‐T TO KILL AN AGROSTIS/LOLIUM PASTURE IN JULY, OCTOBER AND APRIL
Author(s) -
ALLEN G. P.
Publication year - 1965
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1965.tb00348.x
Subject(s) - agrostis , paraquat , lolium perenne , pasture , agrostis stolonifera , lolium , agronomy , botany , chemistry , horticulture , biology , poaceae , biochemistry
Summary. Paraquat, dalapon and amitrole‐T were compared in their ability to kill a long‐established Agrostis/Lolium pasture in late July, late October and early April. Paraquat at 0.75, 1.5 and 3.0 lb/ac and dalapon at 10.6 and 15.0 lb/ac destroyed the sward most successfully but dalapon was not efficient at the April spraying. Amitrole‐T at 4.0 lb/ac had the ability to cause the sward severe chlorosis and to kill most broadleaved species but failed to achieve a substantial kill of grass at the three dates. Paraquat was judged the most efficient chemical being non‐residual and extremely rapid in action at all dates of application. Changes in botanical composition following chemical treatment are described. It is suggested that the composition of regrowth may be decided by choice of chemical and, in addition, influenced by the lime of application. Considerable reductions were achieved in the amount of Agrostis stolonifera recolonizing the plots after July application of all three chemicals but the autumn and spring treatments resulted in strong re‐establishment by this species. A substantial increase of Lolium perenne resulted from July applications and this was most marked following the application of 5 lb/ac dalapon.