Vol. 15—1961 - NorthEastern Weed Science Society

76.
,
Table 2.
Cron and weed response to combinations of CDAAand CDl!t applied
at planting. Observations taken five weeks later.
Treatment
mDt CDAA I"ettuce Toinatoes,
1. e 4 3.$ S.S " '·h.5 1.0 1.0 ' 9.0 9.0
2. 4 8 2.5 5.5 4.0, 7.0 7.0 9.0 9.()
3. 8 0 8.0 6.5 6.5 7.5 8., 8.5 6.5
4. 0, 8 ,3.0, 7.0 7.5 8.5 8.0 5.5 9.0
$. 6 ,3 ,4., 1.0. 6.$ , 8.0 6.0 ' 9.0 8.5
-' .
6. 3 6· " ).0 .6.$ , $.0 7., . 7.,' 8.5
7. 6 6 3.0 6.0 s.s " 7.0 - 8.5 8.5
~.
9.
6
0
0
6
8.5 7.0
...'
8.0
7.5
7.$
,7.0
7.5
1..5,
'" 7.0
5.5
6.5
7.0
10. 3 3 7.0 6.0 7.$ ,6'.0 '8.0 7.0 7.0
li. 3 a 9.0 7.5 8.0 6.0 6.0 $.0 4.0
12. 0, ' .; :,6..0 7.5 as 6S 8.0· '3.0 4.0
13. 4 2, 7.0, ·7 ..$ 8S 8.0 8.0 7.5 6.0
14. 2 4· 7.$ 7.5 8.5 8.5 8.0 . 6'~0 5.5
15. 4 4 5.5 7.5 7S 7.0 8.0 7.0' 7.5
16. 4 0 8.5 8.0 8.5 7.5 8.? 6.5 4.5
17. 0 4 7.$ 8.0 8.0 8.0 8.5 . ,'~5 7.0
18. 2 2 8.0 7.5 7.5 7.5 9.0 6.0 6.0
19. 2 0 8.0 8.0 8.0' , '7.5 9.0 : 4.0' 4.0
20. 0 2 ,8.0 ,8.0' 7.5 1.0 9.0 3.0 5.5
2l. 2 1 8.5 8.5 8.5' , 9.0 . 9.0 : ,.0 6.0
22. 1 2 6.0 8.0 8.5 8.5 9.0 4.0 7.0
23. 1· 0, 9.0 : 8~0 9.0 ' 8." 8., 3., 4.0
24", -0 .~ 8., , :8.0 8.0 8.0 8.0 ,.5 6~0
2,~ , Check 8.0 7.5 8.0 ,6., 7.0 3.5 3.0
.' '
11'9,- perfect c;rOPJ 7 • acceptable; " -stunting;,·, BM'ere damage; 1 .. kill.
Y 9 • perrtte~ control; 7 -acceptable; " -additional weeding needed; ,
1 .. cQmPl~e .ground cover.
of'eDED ~ weaJcon grasses. However" COIIbina.-tionstotaling 'onlly'4 to 6
pOlllldBof. chemical, especially,' at 1-1 ratios, gave good cohtrol ot both
broad;l.eaves and grasses... . ' . . '" . .
,,Perhaps the IIlOst ~port~t;' 'aspect. aftheee re8Ults was that' weed cont~l
improvement _e obtained by --.ne of 'cOmbinations Without any 8.pparelxt increase
in crop sensitivity. except for lettuce. 'With' this crop CDAApr'dYedtoo
toxic whether applied alone or in canbination. Of course, at very.low rat'es
the toxicity disappeared, but weed control is quest.ionable at these levels.
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