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[SANET-MG] GM canola is a nuisance weed
GM canola volunteers are posing a significant weed problem. Along with
the "weed" problem there is the problem of the patent. In Canada selling
a GM polluted crop may require that the the polluted farmer pay the
corporation for the weeds that pollute crop. The judge in a famous
pollution case sugested that the farmer should require that the
corp[oration should come and pull up their property from the polluted
Published in Agron J 98:107-119 (2006)
Persistence of Glyphosate-Resistant Canola in Western Canadian Cropping
K. N. Harkera,*, G. W. Claytona, R. E. Blackshawb, J. T. O'Donovanc, E.
N. Johnsond, Y. Gane, F. A. Holmf, K. L. Sapsfordf, R. B. Irvineg and R.
C. Van Ackerh
a Agric. and Agri-Food Canada (AAFC), Lacombe Res. Center, 6000 C&E
Trail, Lacombe, AB, Canada T4L 1W1
b AAFC, Lethbridge Res. Center, Box 3000, Lethbridge, AB, Canada T1J 4B1
c AAFC, Beaverlodge Exp. Farm, Box 29, Beaverlodge, AB, Canada T0H 0C0
d AAFC, Scott Res. Farm, Box 10, Scott, SK, Canada S0K 4A0
e AAFC, Semiarid Prairie Agric. Res. Center, Box 1030, Swift Current,
SK, Canada S9H 3X2
f Dep. of Plant Sci., Univ. of Saskatchewan, Saskatoon, SK, Canada S7N 5A8
g AAFC, Brandon Res. Center, Box 1000A, R.R. 3, Brandon, MB, Canada R7A 5Y3
h Dep. of Plant Sci., Univ. of Manitoba, Winnipeg, MB, Canada R3T 2N2.
Lacombe Res. Centre Paper no. 1080
Canola (Brassica napus L.) is the most important oilseed crop in western
Canada. Its prevalence across the Canadian Prairies influences the
occurrence and impact of canola volunteers as weeds. Here we determined
the persistence of canola seed in cropping systems so effective
volunteer management strategies can be developed. In mid- to
late-October of 2000, approximately 770 seeds m–2 of glyphosate
[N-(phosphonomethyl)glycine]–resistant (GR) canola were scattered on
plot areas at seven western Canadian sites. From 2001 to 2003 the plots
were seeded to a wheat (Triticum aestivum L.)–field pea (Pisum sativum
L.)–barley (Hordeum vulgare L.) rotation or a fallow–field pea–fallow
rotation in five different seeding systems involving seeding dates and
soil disturbance levels, and monitored four times each year for canola
plant density. Crop seeding date did not consistently influence
volunteer canola density. With some exceptions, higher levels of soil
disturbance led to higher volunteer canola densities. The vast majority
of canola seedlings were recruited in the year following seed dispersal
(2001). Across all locations, rotations, and seeding systems, and
averaged over preplanting (PREP) and in-crop prespray (PRES) intervals,
canola densities were 6.2, 0.7, and 0.0 plants m–2 in 2001, 2002, and
2003, respectively. Canola volunteers were usually most abundant at PREP
and PRES intervals; total recruitment at those intervals averaged across
all seeding systems in the continuous cropping rotation was 3% (25
plants m–2). Preventing seed production in new canola volunteers in 2001
reduced canola densities in subsequent years (2002 and 2003) below those
required to mitigate weed–crop competition influences in most crops.
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