The Rural Voice, 1978-11, Page 31•e
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rootworms. Rotate away from corn on corn
to prevent rootworm damage, especially if
you observed large numbers of beetles in
August 1977."
Lofgren says there have been a few
instances where corn plantedon small grain
or soybean ground has been damaged
severely. In most cases, this involved the
northern corn rootworm which moves into
other crops or weeds to feed more often
than the western rootworm adult. Accord-
ing to Lofgren, this happens most often
during droughty conditions when the corn
dries up before the beetles have laid eggs.
Normally, first-year corn should be
treated only if large numbers of beetles
were observed moving out of corn into
other fields such as weedy small grain
stubble.
Brucellosis
dropped dramatically this year
The incidence of brucellosis in Canadian
beef and dairy herds has dropped
dramatically in the past year. Between
August 31, 1977 and August 31, 1978, the
number of herds under quarantine fell
fmni 1.441 to 528.
Ontario, the only rentainingregion with
"Non -designated" status in the national
disease eradication program, still has the
highest incidence of brucellosis in Canada.
But here, too, the level has fallen sharply.
As of August 31, 1978, Ontario had 327
herds under quarantine. compared with
1,016 herds a year earlier. This means
about 0.5 per cent of the province's 67,000
herds are under quarantine.
"With this downward trend, the prov-
ince could possibly be down to 200 herds
under quarantine by next year. And at that
point, it will each the 0.3 per cent incidence
level required to get low -incidence'
status." says Dr. John McGowan. Agri-
culture Canada's Assistant Deputy Mini-
ster in charge of the Health of Animals
Branch.
He points out that when Ontario
achieves low -incidence status, Ontario's
dairy and beef farmers will have less
stringent controls on the movement of
cattle. Now these producers are required
be law to have cattle tested for brucellosis
at least 30 days prior to a change of
ownership. Cattle being moved from
Ontario to farms in other provinces must
undergo two tests 90 days apart.
"While the incidence of brucellosis is
dawn dramatically. the picture could
reverse just as fast if producers aren't
careful." P. Nii•Gol,an warns.
He urges producers to take a few simple
precautions.
"Brucellosis has a fairly long incubation
period, in which the disease cannot be
detected. To prevent the introduction of
the disease, cattle being transferred from
one farm to another should be tested first
on the farm of origin, then kept in isolation
and retested on the new farm at least 30
drys after arrival. Cows should be tested at
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1HJ RURAL VOICE/NOVEMBER 1978 PG. 31