Vol. 15—1961 - NorthEastern Weed Science Society

54.
EPrAMFORNfJ1GRASS .CONTROL IN POTATOES
E.H. Ralm.:ad.~,W.
Abstract.
F""nOnnaUe/ .:
Eptam (ethyl N, .';'d1-n-prOlJT~thio~arbamate) was evaluated ~for
control of
northern nutgrass. (._ eaCul8ntus.L~) '1npotatoes in 19,8, ~959, and 1960.
This herbicide was ap. "a'Evaiiina ,lites and .rates, 88 a ,spray and in granules,
and with and with~t soil-1nc0rJ?Oratipn.." .
As for time of applicatiOn,:eontroJ.wa5cocd" with applicat~n either just
before pl.anting or just .atter drag-off. I;n 1960, ~en nutsrass infestation
was particularly:il8aV7 r: the. bet-orep1.anUUc~ QP11eatioll:.iBJS"~114J1tJ3" $Ore
eff~tive. Split-applic~tion8, i.e., just after drag-off and just before the
. 188~ cultivation, werendt -sigti11'1e8.i1tly better than' single applications either
just before planting orj~ti alter draa~.Qtt. .. .
. - , .. '. ~ '. .: .
As tor rate of application" .6 Ib/A was slightly better than 4 Ib/A,
especially when applied .juSt a.t'tei"drali;~tt.;· .
Sprays and granulars" were equally effective in over-all apPlications made
just prior to the last eulti.vation. .•. . " .': •
" I"",' '[
All pPtam applications were incorporated with the sollexcEWt in 1958.
In that year, when the herbicide 1I1S applied at S and 10' lb/Atlve days after
planting to soil comp~tecfby' 3/4 inches at rain, contralot "nu~grass was poor.
However" ~n the same rates' were applied just after drag-ott to loose,
freshly-cll1tivated8oil,c~trol of 'nutgrass was good.
None ot the Eptam treatments had a:rry harmtul effects· to po'tiatoes with
regard to emergence, Plant vigor, yields, or percent dr7matter ~in tubers.
1. Assoc. Prot. of H