Vol. 51â1997 - NorthEastern Weed Science Society
Vol. 51â1997 - NorthEastern Weed Science Society
Vol. 51â1997 - NorthEastern Weed Science Society
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
150<br />
alone ac eptably controls typical infestations. The most widely used and<br />
effectiv program for sicklepod in soybean revolves around chlorimuron {2<br />
[[[[(4-c 10ro-6-methoxy-2-pyrimidinyl) amino]carbonyl] amino] suflony l]benzoic<br />
acid} ap lied postemergence. Chlorimuron causes varying degrees of crop<br />
injury, lthough the injury is usually minor and does not affect yield.<br />
However, sicklepod can germinate season-long. In heavily infested fields,<br />
there ma be times when one would like to make a second application of<br />
chlorimu on to control later emerging sicklePOd' The potential for<br />
signific nt injury increases with the second application. There also are<br />
situatio s where chlorimuron alone may not adequately handle all of the weeds<br />
present. For example, chlorimuron does not control common lambsquarters<br />
(Cheno 0 ium album L.). Thifensulfuron {3-[[[[(4-methoxy-6-methyl-l,3,5<br />
triazin- -yl)amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acid} is<br />
very eff ctive on common lambsquarters but combinations of chlorimuron and<br />
thifensulfuron can be quite injurious, especially at the higher rates needed<br />
for goo control of mixtures of sicklepod and larger lambsquarters.<br />
Sulf ylurea-tolerant soybean has excellent tolerance of chlorimuron or<br />
combinations of chlorimuron and thifensulfuron, even when multiple<br />
applications are made. Without injury and stunting of the crop, one can take<br />
advanta of the earlier canopy closure which helps in suppressing lateremergin<br />
weeds. In research with drilled sulfonylurea-tolerant soybean in<br />
North Colina, where canopy closure was not impeded by herbicide injury, only<br />
one pos ergence application of chlorimuron or chlorimuron plus<br />
thifens Ifuron was necessary for season-long control of heavy sicklepod<br />
infesta ions. other research in North Carolina has shown excellent seasonlong<br />
co trol of problem weeds, including sicklepod and morningglory (Ipomoea<br />
spp.), n narrow-row soybean with a single post emergence application of<br />
glyphos teo<br />
HTC'<br />
due to<br />
observe<br />
amino]s<br />
[[[[(4,<br />
benzoic<br />
insecti<br />
would a<br />
plus an<br />
herbici<br />
Anot<br />
conveni<br />
cotton.<br />
posteme<br />
There a<br />
However<br />
that co<br />
sign1£i<br />
The inj<br />
However<br />
and the<br />
cases t<br />
to achi<br />
equipme<br />
toleran<br />
without<br />
the app<br />
The<br />
toleran<br />
applica<br />
equipme<br />
also can help growers avoid potential injury that sometimes occurs<br />
ertain pesticide interactions. For example, injury is commonly<br />
when nicosulfuron {2-[[((4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]<br />
Ifonyl]-H,N-dimethyl-3-pyridinecarboxamide} or primisulfuron {2<br />
-bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl]<br />
acid} is applied to corn previously receiving an organophosphate<br />
ide applied in the furrow. sethoxydim-tolerant corn, for example,<br />
low growers to use organophosphate insecticides for control of insects<br />
effective herbicide for grassy weeds without injury due to<br />
e/insecticide interactions.<br />
er important benefit from HTC's is the option to use easier or more<br />
nt application methods. This benefit will be particularly evident in<br />
Several herbicides are available that can safely be applied<br />
gence over-the-top of cotton for annual or perennial grass control.<br />
so are a few that can be applied over-the-top for broadleaf weeds.<br />
prior to the 1996 growing season, there was no herbicide available<br />
ld be applied over-the-top for broadleaf weed control without<br />
ant risks of injuring the crop, delaying maturity, and reducing yield.<br />
ry can be avoided by directing the herbicides to the base of the crop.<br />
directed applications require a height differential between the crop<br />
weeds. Cotton grows very slowly early in the season, and in many<br />
e height differential necessary for directed applications is difficult<br />
ve. Directing herbicides to small cotton requires precision<br />
t, and it is a very slow and very tedious operation. With bromoxynilor<br />
glyphosate-tolerant cotton, one can spray overtop small cotton<br />
worrying about injuring the crop. Special equipment is not needed,<br />
ication is much easier to make, and it can be done much more quickly.<br />
bility<br />
e also<br />
ion is<br />
t.<br />
to apply herbicides over-the-top without concern over crop<br />
gives growers the potential for aerial application. Aerial<br />
of great value when wet fields preclude use of ground
Change language