Vol. 15—1961 - NorthEastern Weed Science Society

70.
gives an average of data from the four tests. The treatments in
each test were replicated four times, and the weed control averages
were based on average quadrat counts of the four replicates in
each experiment.
TABLE 1.
SUMMARYOF GRASS WEEDCONTROLAND TOMATOINJURY
- -DiPhen~~d-t-A;e;age-p;r~e;t-c:n~r:1-I-A;erage-I;j:r; ;a~i;gY'-
- -
Lb/A I Grass Weeda!! I Tomatoes
- -.­- - - - - -,­- -1­ - - - - -
I
2
54
I
1.0
4 I
88
I
1.1
6
92
1.2
8
96
.I
1.7;
.......... ­- - - -
I,
- - - - - - -
_ ~ ~'I ......~ ......__ ..... '_ - - - - ..... ­ ......- ......­ - -
1/ Four we-eksafter treatment
l/, InjUry Rating Scale: 1 •
4 •
no injury,
severe, 5
2 = slight,
.. death of
3
plant = moderate,
Broad1eat weec\ contX'ol was generally poorer than grass weed
control, due chie.f1y,to the 'occaf;iona1 presence in the plots of
Jimsonweed and ragweed, ,two species not. controlled by diphenamid.
P~gweed, however, was satisfact.orily controlled in a1l trials at
6 Ib/A. Tomato yield data were collected in two t.ests. There was
no depression in weight of ripe fruit at harvest. and, in fact., nonsignificant.
increases in yields were obtained at the 4, 6, and 8 ~
rates.
Other:Vegetable Crops -- Excellent results were obtained with
.diphenamid in two vegetable crop tests. Table 2 give,s the results
of one of these tests and Table 3 presents t.he responses of t.he
crops tested to dipheaamid.
TABLE 2.
THE EFFECT OF DIPHENAMIDON GRASS AND BROADLEAF
WEEDSIN VEGETABLECROPS
- -R~t; ~i- Averag;; No: We;d,;jsq:
'Ftlr 'I :-A;e;age-Pe'r;e;t.-c~ntrol.!l
Lb/A 'I' Grasses' 'Broadleaves I Grasses I Broadleaves
----~-----~~-~.~-~~----------------
0'" I' 4107'\ ,