Vol. 16—1962 - NorthEastern Weed Science Society

lA.aistant Profeasor of Orn.mental Horticulture, Col18ge of Agriculture,
Th. Penn.vlvant • .Rt:A~. n"fv "9_"n4 1)a" 'D .. __ .1 _'.
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Pr .. ~1abt'WetdcCoftt~ol
Chilo Baramaki 1
in Ha~ rtantillg8 . 1:>'
Dudng.l':60. Pft)Ia1sing,re*ult:iI were obtaiMd 'tnt1ie ueeofpre-plane'
herb:LdJe. inrtbaoontrol of '.filS!!.' in pfttl1tA~,I\S pl*iiJt:iog.. , The te.t8 vm
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expanded thi' year by inclucling narigolds in the tut.... '.ISroof tbe..o~:o
promising chemical. in 1960 were kept and three other. added.
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The te,te were made in a Hagerst.l)l!ID.ilt l~gtll'lchwa. Z'Otottl1~rrL,
several times to a depth of 5-6 lnches. Pivo herbicidal at tbree concentrations
plu. an entreated check were replicated three times in a split
plot design. Bach plot had an area of 100 square feet.
The herbicide' were applied on June 5, 1961. The air tempe•• cure w••
in the SO's and the so11 temporature at 6 inches depth was 6BoF. The herbicide.
u~ad included Casoror., EP1~, St~uffer a-1607, Ti11am and Vorlex. Bacb
of the fir.t four chemicals were applied by fir.t mixing tha chemical with
a .ufficient 8IIIOuntof water to maleea gallon of mixture and then sprlnkliq
this amount on eech plot.
The.e plot. were rototi11ed to a depth of 2-3 incbes immediately after
herbicide application. Vor1ex we. injected into tba sol1 with a fUllllgun.
ODahundred eighty one ,injection., each approximafl8ly 9 inches apart wera
made in each plot. All of the plots were heavily weterad aftar treatment.
Spry, a dwarf double Prench mari801d was planted in all of the plot.
at different date. following soil treatment. Bight plant. were transplant.d
in each plot at tbe following interYal after treatment: one day, two day.,
one week, -.0 weeks, three week., and four weeks. Another planting ws.
made in the fiftb week in the Vorlex treated plots.
USUltTS A!mDISCySSION
The plots were checked for weed prevalence on July 5, and August
17, 1961, which were approximately 4 and 10 week. after treatment. Tha data
on weed prevalence I.e .UIIIJlar:lzedin Table 1. After four weaks weed control
in all treatment. was good except in the check plot. and tho.e treated with
Vorlo at ~ and I.iquart per 100 lMluarefeet. After 10 week. good weed
control wa. obaerved in the plotl t ....at.d with c.aoroo at 2, 4 and 8 poUDda
per acre, EPTCat 10 pound. per acre, and R-1607 at 5 and 10 pound. per
acre.
The predomineat weed. were: tuableweed, gre.p pigweed, green and
yellow foxtail, lambaquarter, winter cree., Pennsylvania smartweed, and
hairy crabgrae.. Le.ser frequent .. eds included: canada thlaUe, bitterdock,
dog fennel, three •• eded mercury, pur.lane, ca.mon ragwe.d, black