Vol. 15—1961 - NorthEastern Weed Science Society

144.
Results
Table 5 shows the herbicides used and the weed control rgtinga
each month prior to cleaning the plots of existing weeds•
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TABLE5. HERBICIDES APPLIEDK>NTHLY OURIm THE1960 SEASON
AND WEEDRATINGSJUSTPRIORTO EACHAPPLICATION
The first application was made Hay 16.
Plot Numbers correspond to same plots
a8 in Tables 2, 3, and 4.
PLOT RATE WEEDCONTROL RATINGS
2
NO. HEIUlICIDE(lb./A) l
JUNE16 JULY15 AUG.12 NOV.3 AVERAGE
4 EPTC 4 5.1 5.3 6.3 , 5. 1 5.8
6 CDIC (spray) 8 7.3 3.0 6.7 5.7 5.7
7 CDIC 8 7.7 6.0 7.3 7.0 7.0
12 CIPC 8 5.0 5.3 6.0 4.7 5.2
I Atrazlne 1 9.0 8.3 8.7 9.0 8.8
3 Simazine 1 8.0 6.1 8.0 8.3 7.8
(Treatments below were applied July 1 and August 12 only)
2 Atrazine 2 7.0 8.7 1.0 9.0 7.9
11 Simazine 2 7.7 1.7 6.7 9.0 7.8
1 All herbicides were applied as granular except as indicated.
2WeedControl Ratinas: 1 • no control; 9. clean
A rating of 7 meant that only a very few small weeds
were present an~ plotl could be' cleaned" quickly.
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Of the treatuents applied monthly. the beet weed control resulted
from simazine 1 tb.tA andatrazine i lb../A. Second best, but satisfactory
weed control; was CDEC8 lb./A granul~r. Consistently poorer ratings
resulted fromCDEC8 Ib./A as spray, ~PTC 4 lb./A, and CIPC 8 lb./A.
The plots receiving atrazine 2 Ib./A and simazine 2 lb./A "wben
needed" reqUired two weedings and two appUcations for the seasOIl. Check
plots were weeded five times.
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Stand counts and height measurementa of the plants ware taken
November8, 1960 to evaluate tbe~njury fro. herbicidal treatments. The
results showed that (1) TaXU8and Juniperus apparently were not affected
by the treatments. (2) stand of ericaceous planta was not affected by
the treatments, (3) height measuremeuts gave significant differences for
Azaleas only. The measur$ments showe4 ~nbibited growth of Azaleas fro.
two years appllcatioll8 of EPTC'(S lb. first year and 4 lb. second year);
CDEC(10 lb. first year and 8 lb. second year); S1mazine (2 lb. both years).