Vol. 15—1961 - NorthEastern Weed Science Society

184.
Table 1. Average n\DDberof poison ivy stems in six l/lOOth-acre replicated
plots one. two and three years followlng a 11ngle herbicide appli­
~aiiPfl=(~rJ:t= 19~?J.:io_eJ:t&blilhldJglI01 ~v~ 1 n =8!!!P&l£ grihlrg.= ==
,
_Y!.aI,'
,
AyeI,a,&e_npl!eI,~f"p~i.!on!"I. .!.t.!P'!.~e!: ~l.2t
, , , , ,
_
" ATA 2.4.5-T '2.4.5-tP ' Ammate' 2.4.5-T'
Ester , Aaine' Check
'4 Ib/Aa 1 ' 4 lb/A' 4 Ib/A ' 150 1b/A,' 4 lb/A'
, " 1 , , , ,
------------------------------------
Treatments Around Trees
1960 • 22.5*
1
33.8* 52.3* 54.8* 69.0* ' 181.8
1
1959 26.0* I' 42.2* 76.3* 90.5*
, 111.5* , 477.0
" '
1958 1 0.3* 12.5* 12.0* 5.8* 12.5* , 136."7
Treatments Between Trees
1
1960 ' 15.3* 21.2 17.0* 31.7' 30~2 112.5
1959 • 27.5* 35.0* 46.2* 44.2* 48.2* , 233.0
I,
1958 ' 0.3* 2.8* 11.2* 2.2* 6.3*, , '55.0
, • 1 1 , •
. }...
------------=----------------------­
a All herbicide rates were applied in' 200 gallons of water per treated
acre. 'Rates of all herbicides. except Ammate. are expressed as pounds
per acre of active ingredient. AalDateie given as the n\DDberof
pounds of formulated herbicide per acre.
* Denotes significance from check at the 51' level. '
,
, In each of the 'thre. years following tha slngle application.
ATA. 2.4.5-T Ester. 2,4.5-'1? 2.4.5;'T Amine. and Ammatehave given a
significant reductioa in u~ber of poison ivy8tems in'plots'around
trees when compared with the check~ 'lbe foregoing' treatments have
also given' a .'ignificant reduction in pobon lVy stems ,in plots between
trees during 1958 and 1959. one'and twO years after treatment.
In 1960. however. only ATAand 2.4.5-~ significantly reduced the
number of stems in plots between trees i • · ' "!
1.- Schube;t70sca; i.- 1959. Comparisons of five herbicides used to
kill established poison ivy ln a mature apple orchard. Proc. 13th
Annual Meeting NEWCC:57-59.
2. 1960. Evaluation of five herbicides for
kiliing- ;stabiisied poison ivyln an apple orchard one andtvo
years following a single treatment. Proc. 14th Annual Meeting
NEWCC:219-220.