Vol. 16—1962 - NorthEastern Weed Science Society

COMPARISONOF CHEMICALSroJ{'''''EMBRGENCE
JobD1t'. HaVis 2
~SS CONTROLIN TURF l
'::
493
The area used for this t.at had been ..... dto a fairway mixture
about fifteen years previously~ The grasses present were mostly
bluegress and fescues. Miscellaneous weeds were present, includlQ8
dandelion and plantain, but very little natural: crabgrass.
During the first two week. of April, 19&1, the grass was mowed
to 1 1/2 inches, fertilized with 10-6-4, and a light top dressing of
soil was applied. The area ¥as then seeded Wf.th5 pounds of weed
seeds having a high perceDtapof crabgrass, ,l'the area, 32 x 60 fe.t,
was dlvided tnto24 plots '1:'FliO feet in siH/le This provided plott
for 8 treatllle!¢s, ll\clud1ng.'a,reheck, replica_ three times. The'
area had a slight pitch to the east but not _fieient to cause
excessive washing.
Seven granular pre-emergence herbicides were applied April 14
at rates racollllll8ndedby tu "'lWfacturers, a.':.11ows:
Per 1,000 Sq. Ft.
,:"H
(Pounds)
PAX- "new" formul~~ (more arsenic~ •. Less N) 20
Bandane 7.5%
6.1
Tricalcium Arsenate 48% (1961 formu1tlion)
16
Dactha1 2.3%
10
Zytron 4.4%
8
Ca1~i~ Propyl Arson.~a 20% :r£.,
5
Diphenatrile 11. S%
6
Irrigation was not available. The spr1Dg weather was cool and
moist, rainf,dl during May"measuring 4.67 1...... Crabgrass in.the
test plots germinated about JUne 15. The fiutweek of July the turf
area was given a second appl1cation of fertiliser and sprayed with
2,4-D to kill broad-leaved weeds. The grass was mowedweekly at
1 1/2 inches. 0,1
L. t.e.,
lContribution Number1331. Maiiachusetts Agridaltural Experiment Station.
2Department of Horticulture, University of Massachusetts, Amherst.