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ranged from 74 6 to 80 6 76 5 to 78 1 and 78 3 99. Development of a consistent green­ (B.D.G.) Agriculture and Agri-Food Canada, 107
to 79 3% for FHBi FDK and DON respectively house inoculation method for Fusarium Science Place, Saskatoon, SK S7N 0X2, Canada.
Fusarium head blight pressure was low in 2019 avenaceum for screening germplasm of
and 2020 most likely due to drier than normal Pisum sativum Clubroot caused by Plasmodiophora
weather conditions which were unfavorable S PANDIT S CHATTERTON AND C VUCURE­ brassicae Woronin can dramatically reduce
for the disease The models will be used to VICH University of Lethbridge, 4401 University quality and yield of brassica crops The resting
power an interactive online digital viewer and Drive, Lethbridge, AB, T1K 3M4, Canada; (S.C., spores can persist in soil for many years Crop
provide early warning of potential FHBi FDK C.V.) Lethbridge Research and Development rotation is an important management strategy
and DON epidemics in prairie cereal crops Centre, Agriculture and Agri-Food Canada, because a 2­year break from a host can reduce
5403–1 Avenue South Lethbridge, AB, T1J 4B1, concentrations of resting spores in soil Bait
98. Greenhouse and field evaluation of Canada. crops can reduce inoculum le vels by stimula­
Amisulbrom for clubroot management ting the germination of resting spores and the
Z YU S F HWANG AND S E STRELKOV De­ Fusarium avenaceum is the most dominant resulting Zoospores ultimately die if a suscep­
partment of Agricultural, Food and Nutritional pathogen in the pea (Pisum sativum) root tible host is not available to complete the life
Science, 410 Agriculture/Forestry Centre, rot complex in the prairies Management of cycle Also application of lime to raise soil pH
University of Alberta, Edmonton, AB T6G 2P5, fusarium root rot (FRR) is challenging as fully levels above 7 2 reduces clubroot severity in
Canada. resistant cultivars are absent and control op­ part by inhibiting resting spore germination
tions are limited to crop rotation To develop The interaction of bait crops and liming on
Clubroot caused by Plasmodiophora brassi­ a screening system for breeding purposes spores of P. brassicae was not known The
cae is an important constraint to Canadian three experiments were conducted In the first efect of selected field/cover crops (wheat bar­
canola (Brassica napus) production The fun­ experiment disease severity (DS) of two culti­ ley soybean field pea perennial r yegrass) on
gicide amisulbrom a quinone inside inhibitor vars ('CDC Meadow' and 'Carmen') in response concentrations of spores in soil and the com­
(QiI) was evaluated for efectiveness as a clu­ to seed soak inoculation by three F. avena­ bined efect of growing wheat a potential bait
broot management tool Liquid (GWN10440 ceum isolates at four concentrations (1000 crop and three liming rates on concentrations
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1000 g active ingredient (ai) ha ) and fertiliZer 5000 10000 50000 macroconidia/ml water) of spores were assessed in short­duration (8
formulations (GWN10750 700 g ai ha ; was measured Results indicated that 10 000 weeks) studies under controlled conditions
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GWN10751 1000 g ai ha ; GWN10752 1500 macroconidia/ml was the best inoculum dose Wheat reduced the concentrations of spores
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g ai ha ) of amisulbrom were compared on to achieve moderate disease severity 'CDC compared to a no­plant control However the
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clubroot susceptible and moderately resistant Meadow' had significantly higher DS at all ino­ hypothesis that root weight of a crop would
canola hybrids under greenhouse conditions culum concentrations compared to 'Carmen' be correlated with spore reduction was not su­
and in field trials conducted in Edmonton in In the second experiment 13 pea germplasm pported This indicated that crops with more
2019 and 2020 No significant diferences were lines were screened in a Fusarium disease nur­ extensive root systems did not induce more
obser ved among the amisulbrom treatments ser y and in a greenhouse using the seed soak spore germination or reductions in spores In­
in the field in 2019 possibly due to excessive method Germplasm lines 'K­2' '5005' and creasing the rate of lime reduced spore num­
raining In 2020 treatment with amisulbrom '5004' had significantly lower DS in the 2019 bers and there was no interaction between
resulted in significant reductions in the field nurser y while none of the lines performed growing wheat and applying lime Therefore
clubroot disease severity index (DSI) in the diferently from the susceptible control in 2020 the two approaches do not counteract each
field; the best control (nearly 60% reduction field or greenhouse trials Due to inconsistent other and can both be used by growers
in DSI) was obtained with GWN10752 and results between greenhouse and field scree­
GWN10440 Under greenhouse conditions the ning four diferent inoculation methods were 101. Estimating fresh weight of pea shoot
treatments were tested at low (1 x 10 resting then compared in two cultivars ('CDC Meadow' using measurable morphological traits
5
spores g soil) and high (1 x 10 resting spores and 'CDC Dakota') The inoculation methods X KONG Y KONG AND Y ZHENG School of
7
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g soil) inoculum pressure Clubroot severity were 1) seed soaking; 2) pipetting inoculum Environmental Sciences, University of Guelph,
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decreased with increasing amisulbrom rate to seed at planting; 3) pipetting inoculum to 50 Stone Road East, Guelph, ON N1G 2W1,
for all fertiliZer formulations with a DSI < 20% lower stem and roots two weeks afer planting; Canada.
obser ved in both cultivars following treatment or 4) soaking roottrainers in inoculum two
with GWN10752 at the low inoculum le vel weeks afer planting Root soaking resulted in Non­destructive estimation of shoot fresh
The greatest reductions in DSI were achieved consistent FRR development in both cultivars weight (FW) using measurable morphological
with the liquid formulation GWN10440 at both and will be tested further on more germplasm traits can potentially benefit robotic har ves­
the low and high spore concentrations While lines ting and other decision­making processes
both liquid and fertiliZer formulations of ami­ in pea shoot production To predict shoot
sulbrom show promise as part of an integrated 100 Growing wheat and liming to manage FW nine regression models were developed
clubroot management strategy the fertiliZer clubroot including two power models using stem
form may be more suitable for Canadian cano­ S C DRURY B D GOSSEN AND M R MCDO­ diameter (SMD) or stem length (SML) as a

la growers given the costs of equipment time NALD Department of Plant Agriculture, Univer­ variable and se ven linear models using part
and labour sity of Guelph, Guelph, ON N1G 2W1, Canada; or all the following variables SMD SML leaflet

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