Vol. 16—1962 - NorthEastern Weed Science Society

The following comments on the various,hel'bicides are based
on observations made in 1961 and in previous years:
ATRAMETRYNE ANDPROMETRYNE:appeal" to cont.rol annual grasses
better than tl'letlzine; may be 'less effective on
ragweed than DNBPJin the absenoe of leaching rains
may be applied either at planting 01" at emergence,
and at a 2-4 pound rate may be ueffe~tive as DNBP
on annual broedlea: weeds and mol". effeotive tha~
DNBPon annual grasses,
CASORON:
DALAPON:
one pound pel" aCre does not etreotively control annual
weeds; 2 and 4 poUnds in p'l"eviob.s years has signifioantly
reduced yield. ~
DIPHENAMID: more effective on annual grasse$ than DNBP, but at 2
and 4 pound rates is less eftectiv$ on annual broadleat
weeds; requires reintorceml!lnt with other herbicides
tor acceptable total annual weed control.
, ;
DIURON: applied alone, has not consisteritly given acceptable
weed control: applied with DNBP,has frequently given
a longer period of residual weed control than DNBP
alone. The residual period was not lengthened in
1961 tests. '
~:
DUPONT~:
in combination with DNBPhas usually increased annual
grass control oyer DNBPalone; frequently the period
ot residual weed control is unaooeptably short.
peroent control ot annual broadleat weeds is not
usually exceeded by other herbialdes but often has a
short residual per fod of sa tist«ctory con trol: controls
annual grasses about half as ett~ctively as it controls
annual broadleat weeds; in heavy infestations of ann~al
grasses, usually will not give aaequate control but
usually has given more nearly satisfactory control than
other selective herbicides.
183
FALONE:
NIAGARA