Vol. 15—1961 - NorthEastern Weed Science Society

246.
, _ .~. ,.': ; ,.~ ..'" ;'; .... ,
At both rates ~n, Zytr,ol\:wa.s applied·alone or included
­
in a combination at Georgetq.m,~there ,was an increased vigor
noted ':Ln the,soybean plantll at. tbe.endof the fifth and. tenth
weeks following planting.;.. )tot.present·no evidence has been
produced to deter.m1neeXac~.reas9nafor this phenomenon.
Two rates pf DNBPand Zytron and combinations or mixtures
of each were evaluated at Georgetown and 'Newark, ~laware, in
1960. The 31bs.1A. rate of DNBPand' 10 lb'8.1A~ rate of
Zytron gave good broadleaf weed control. Good grass control
W8$ obtained by the 10 lbs./ A. rate of Zytron and the 3 lbs./ A.
rate of the two chemicals combined.
The combination of DNBPand Zytron may be desirable in
areas Where both grasses and broadleaf weeds are a problem.
Yield increases reaulted from the use of chemicals at both
locations but demonstrated the need of knowing what weed
needs to be controlled before deciding what and how much
chemical to apply. No chemical or combination in this study
was effec t:l.ve agains'1: the morning glory.
, '
All Zytron treatments at Georgetown showed an increased ­
vigor at the end of five and ten week Periods folloWing planting,
but the exact reasons for these results were not determined.
The stunting observed in DNBPplots at the end of
the. fiye week period was not reflected in crop yields.
Literature
Cited
l~ Cole, R. H.,'Springer, F. B., Crittenden, H. W. and
Connell, W. ~. ,Delaware soybean surveys 1n1960. Unpublished
!Dimeo. 1960.
2.' Indyk, ~. W. Pre-emergence weed control in soybeans.
Proceeding. of the Thirteenth Annual RortheasternWeed Control
Conference. p, 139-143., '1959.
3. Meade, J. A.and Santelmaon, P. W. Weed control in
Maryland~.,y;bePs...Proceeding8' oftbe ,ourteenth 'Annual" Northeaste:ql
Weed, Gontrol Conference. p , 253-258. 1960.
4. ' Springer, F. B. Growing Soybeans'. Fact Sheet c-a
(AAE). p. 1-2. 1960.
5. Wil tee, M. G. A new herbicide for turf - Zytron.
Proceedings of the Fourteenth Annual Northeaa tern Weed COQtrol
Conference. p. 292-298. 1960.