The Rural Voice, 1978-06, Page 22resistant plants the blocking process did
not work.
• Machado said the resistant strains of
lamb's quarter and the other weeds
probably had always existed in low
proportions but only had a chance to
multiply when atrazine knocked out the
other strains.
He said other herbicide -tolerant weeds
are likely to develop in situations where the
same crop is grown over a number of years,
particularly if only one herbicide is used.
He now is working out the inheritance
patterns of broad -lead tolerance in
broad -leaf weeds.
Although there have been no reports of
the failure of Atrazine to do its job in Perth
County, Pat Lynch, soils and crops
specialist in Perth feels' the problem has to
exist.
It's just a matter of time, he said, before
Perth farmers discover weeds overpower-
ing the effects of the herbicide. He said he
has had calls about the problem in
neighbouring counties already.
Farmers should be alerted to the
possibility of Atrazine not doing a complete
job for them, he said. There are a number
of other chemicals. most of them cheaper.
that will do the same job, he said, so it isn't
a serious problem.
In the U.S. corn belt. where monoculture
has been practised much longer than in
Ontario, atrazine weed tolerance is not yet
a problem. Bandeen explained that
growers there are not totally dependent on
chemical control but make wide use of
scufflers to control weeds.
He said most Ontario farmers outside
the traditional corn -growing area do not
own this type of cultivating equipment but
that it may have to play an increasing role
in weed control.
Future weed control may rely on rotating
herbicides and crops and involve cultiva-
tion as well. But for the present. Bandeen
recommended that farmers use the
herbicide dicamba to control broadleaf
weeds in corn.
Traditional farming practices aggravate
the problem, he said. citing the case of
farmers who use farmyard manure
supplied by animals eating forage made
from weed -infested corn. The manure
contained seeds that spread the resistant
weeds from one corn field to a whole farm.
International
co-operation
on soybeans
International co-operation in plant
breeding will likely prove a boon to farmers
in both Canada and the USSR, and
ultimately to consumers as well. Soybeans
are becoming an increasingly important
crop on both sides of the world, but
production of this high protein and very
versatile crop demands a fairly long
growing season.
Plant breeders are constantly seeking
shorter season soybeans that will be
adapted to new areas where the crop is not
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PG. 22. THE RURAL VOICE/JUNE 1978.