Vol. 16—1962 - NorthEastern Weed Science Society

BxceUentcrebgraes COM.1 was obtalned'lKl:h Bactha1 and giatiifhr
Zytron ln 1960 and also In 1961.'" , I
Ch1ol'dane,.at 80 IbsiacMr rate. gave SObel!C:oiltrol 1111960arid:
excellent contl'Oltb 1961. ,! ' },;.(;
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CalctUIII a'r.enate gave.fab control in botlli 1960 and 1961. ; AU"~a
treated ln' 1960ilndre-treatad :tIl,'1961 indicate. excellent control in 196\'~
Good and· excellent· control wer.) obtdned by doubU.** aad tripling the t"
reco_dad rate 'of applicatiOWl fot:' this chemicd:.'l':t! '."
v),:):
lneffective.
FHA. wIlich 11 not r~oaed for
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pre-e~*ftce control. was 'j
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The u.eR1cal compleX'fpl.e poor control;'!lo'
ZytroR emulsion gave ·e.callent control ia J t 960 . but it also 8e"'rely
injured the desirable grasses. Zytron M2025 which~.used in 1961 gav~
excellent control of crabgrau ;"','4id not injure 'file desirable gras.e~~J
Dipheny1acetonitrU geve excellent control at the higher rat.eof
application (28.4 tbs> per acre)'. lCalcium ptopyl'~odateand Upjohnptoduct
U4513 were ineffective e. pre-emat .. nce crabgra8s'i1njrs. Grase'in pl'ots
treated,with U451~ ap~ared stunted two weeks after treatment. Five weeks
after the date of. application. the turf in these plots was severely injured
and did,not recover.
Atealtreated with eft"~Ca1c1um arsenate. Zytron emulsion. or
Chlordane 1n 1960'aadnot re-t~~ in 1961 had the, lowest re-infestation
of crabgra... 'lbe apparentreli«~ control of t~ chemicals could have;
come about by' control of new seed Which may have come into these areas or'
possibly by.agreater kill oLthe eid.st1ng seed in 1960. The fact that
some degree of control was found 01t.1the plots which were hand seeded wit~ :
crabgrass indicatel the possibillt"of some carryover of these chemlea~."
from the 1960 to t.he 1961 season. ( 'I '
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