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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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528<br />

Pre- andpost ..emergejljCec:rabgrass contHi in lawn' turf l<br />

'i t .... "., -<br />

R. B,. ~~'~C. R. Skog~~<br />

If man could find a cheap,*,fticfent andsaf~;bbeinical to control the'<br />

"d"""""'" '~""I"'" ,','<br />

conrnoncrabgrasses', Digitaria l'cblt*mwn and D " ungulntUs, tu,;f, t:ech~<br />

nicians would be able to solve many chronic compla' 's. The crabgrasses"he '<br />

versatile in that they grow vigorously under the various cutting heights normally<br />

employed for turfgrassesi'!~ 3/16 inches;,,:r~~er unmowedconditions,<br />

they grow into robust plants often reaching three feet in height. Because of<br />

their sun..loving hab,it and heat,to+uance they ~f..1~,t,and grow under ~ry<br />

high temperatures whel) basic l~~ ~asses fail. 1JlIae, grasses can aho :N~y<br />

adapt to fmile or infertile soil conditions var~9 greatly in reac:ti~ All<br />

of these factors may need to be c:onsidered in attempting to develop a themical<br />

control.<br />

Methpd§ and Hatedals<br />

, ~ ". ' :l<br />

All rates of applicationare,'iven in pounds '-. acre. Injury reJdinS.<br />

are read aSI 0 = no 'injury, 5= complete kill. Plant counts were made,p'¥,:<br />

counting crabgrass plants in two one-foot squares per plot. The average of<br />

plant counts was calculated and uS,ad to compute t~~ ~rcent control over check.<br />

Pre-ernergEince<br />

site<br />

The area selected for the pre-emergence tria!F.was a level, well-d:l'aned<br />

on Bridgehampton silt loam. The grass stand was several years old and<br />

consisted" ~nd.iJll1n1shing ordef"9f Col onialbentlW~ss, Kentucky bluegrass and<br />

Red fescue,. ,',_, " :/,:: " '<br />

,j--"""".' (.•.. ::"-'" '.·',-·Jr~""J<br />

In order to provide a untform stand of crabgraas'the test area was overseeded<br />

with crabgrass seed in November of 1960. Seed from 1959 and 1960 was<br />

mixed and broadcast over the entl'nLarea'<br />

inch and scarified with a verticut.<br />

J,' "<br />

after it< hlld been mowedto 3/4 of an<br />

'~.i: ,F'.<br />

Throughout ibe :1961 growin9('~~'$on the 9raS$,:JI8,~owed as neede,d at ,a,<br />

height of 3/40:f~ninch. Hea~~c:~ippings we~e ~~~, ,Frequent 11gh1

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