Vol. 16—1962 - NorthEastern Weed Science Society

209
TABLEII
Average Weed Cont~l ExhibitedbtiilACTHAL
Formulations Applied on Ilex crenat&convexa
Percent WeedrControl
DACTHAL RatEi Cr'a\)grass Purslane taiilbsqutrs. MiscellaneG\is
Form.' lbActive/A 7/6 EZ5 7/8 8(5 7/]':8/5 7/8 .8t:>
W-50 5 100 100 98 96 94 100 48 52
10 100 100 100 100 98 95 46 .j?
15 100 100 100 100 99 100 42 "46'
G-l.5F 10 100 ).(10 100 100 95 99 53 ,746
15 100 98 100 100 92 100 36 ::4"'5
G-5 5 97 94 99 99 90 92 36 38
10 100 99 100 100 93 96 36 41
15 98 98 100 96 91 94 47 50
Weeds!ft 2 of Check Plots 4 6 . 2 3 1 3 1 2
Treatments applied 10/23/59 and 6/10/60
Crabgrass, purslane and l~squarter s were the, predominant weeds in
these plots. Ragweed, commonchi,ckweed and grape frQm,pomace are included in
the miscellaneous column. Good weed control was secured in these plots
throughout late fall. The effectiveness of the two treatments could be observed
in the long period of weed control and a sharp delixwationwas observed in the
fall 'between them, and the unt.reabedcnecks , createdby' the germination and '
invasion of Poa annua at the extremities of the plots. The absence of Poa
~ in the tra'iited areas strongly suggested effectllve control of this Weed.
The results reported from P31'thenocissus tr1cu!!pidata and ~convexa
plots are' typical for all thE; herbaceous and woodY or~entals under test
during 1959--1960. "
As can be seen from the list of ornamentals which tolerated treatments
with DACTHALherbicide, plant response is quite favorable. However, duri,r\lL
1960 seven herbaceous species exhibited some degree of plvtotoxicity as shMl
in ~l'able III.