The Rural Voice, 1990-09, Page 60ADVICE
(... wheat stubble, cont'd)
"Don't wait until it becomes a major
problem."
Pat Lynch , former OMAF field crop
specialist and currently consulting
agronomist with Cargill Ltd., agrees
that many cereal growers should plan a
fall herbicide application to keep Can-
ada thistle and field bindweed in check.
He also agrees that fall is the most
strategic time to attack the root system
of field bindweed: "Weeds such as
bindweed, after grain harvest, will start
to grow again and are in a very vulner-
able stage. At bud time, they're going to
be trying to fill up those roots again, so
we've got a good opportunity to control
them."
"A well-timed September applica-
tion is far superior to a June application
for these perennial weeds."
Not unlike herbicide applications at
other times of the year, timing is impor-
tant with fall perennial weed control.
"The one critical thing about this post-
harvest application," Lynch says, "is the
fact that the bindweed must be actively
growing. It's at that bud to flower stage.
It's a very critical period of time that this
herbicide must get on."
"With any of the problems that I
have experienced in terms of poor con-
trol, I've been convinced that it comes
back to the fact that the stage of growth
wasn't right, or the plant was not ac-
tively growing ... If I could have my
way, I'd be spraying in September when
there was lots of moisture, on a nice
warm day."
In general, the season for this appli-
cation begins in late August and ends by
the time of the plowing match.
Once the herbicide has been applied,
it requires approximately ten days be-
fore tillage or killing frost in order to
translocate effectively into the root sys-
tem.
Over the past 15 years, perennial
weeds have become more prominent in
the overall weed spectrum of Ontario
field crops. Given the acknowledged
success of fall -applied herbicide pro-
grams and the inherent difficulties of
controlling Canada thistle and field
bindweed through either in -crop herbi-
cides or tillage, it's fair to say more
farmers than ever will be looking at
wheat -stubble as a golden opportunity
this fall.°
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•
to t...* A
Holland Equipment Limited
P.O. Box 339, 20 Phoebe Street, Norwich, Ont. NOJ 1P0 (519) 863-3414
SEPTEMBER 1990 57