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Abstracts

nadian prairies with considerably high N fixa­ aZoxystrobin (FRAC 11) fluopyram (FRAC 7) Session 18. Student oral competi­
tion potential and nutritional value The N fixa­ and difenoconaZole (FRAC 3) but insensitive tion: Plant Health and Innovations
tion capacity of pea in Canadian environments to pyrimethanil (FRAC 9) Sensitivity to aZox­
ranges from 50 to 55% of crop N requirement ystrobin was present in isolates collected from in Agronomy
Nodulation mutants such as nod3 Sym28 asparagus in 2012 but the population trended
Sym29 and nod4 have been de veloped by towards insensitivity by 2016 with 97% insen­ 97. Weather­based models for forecasting
and managing Fusarium head blight risk
researchers in Europe for improved N fixation sitive in 2020 Isolates from 2012 were sensitive
but not e valuated in a breeding program We to fluopyram but 37% of the 95 isolates in western Canadian cereal production
evaluated the potential of 20 pea lines derived collected in 2018 and 2019 and 100% of 30 T T MATENGU P BULLOCK M S MKHABEL A
from crosses between two of these nodulation isolates in 2020 were insensitive Most isolates F ZVOMUYA M A HENRIQUEZ T OJO R

mutants (nod3 and Sym29) and Saskatchewan (99%) were sensitive to difenoconaZole based PICARD R AVILA AND M HARDING Depart­
adapted pea cultivars CDC Meadow and CDC on a mycelial growth assessment but conidial ment of Soil Science, University of Manitoba,

Dakota for N fixation and agronomic traits germination was not inhibited even a high rate Winnipeg, MB, Canada; (M.A.H.) Morden
N fixation capacity of tested pea lines ranged (100 ppm) For pyrimethanil 94% of isolates Research and Development Centre, Agriculture
from 50­80% Best linear unbiased predictions from 2018 and 2019 were insensitive These and Agri-Food Canada, Morden, MB, Canada;
(BLUPs) and orthogonal contrasts showed active ingredients which have been and are (T.O.) Soil and Ag Weather Surveillance, Mani­
that pea lines under study performed better being used on onion in Ontario no longer toba Agriculture and Resource Development,
than checks Pea lines especially those arising provide efective SLB suppression Identifica­ Winnipeg, MB, Canada; (R.P.) Crop Production
from crosses with CDC Dakota had on average tion of alternative management strategies is Extension, Manitoba Agriculture and Resource

10% more grain yield 2­3% more seed pro­ required Development, Somerset, MB, Canada; (R.A.)
tein and 5% more total N fixed than checks Ministry of Agriculture, Government of Saskat­
The amount of fixed N showed moderately 96. Photoperiodic response of in vitro chewan, Regina, SK, Canada; (M.H.) Plant and
high and significantly positive correlation Cannabis sativa plants Bee Health Surveillance, Alberta Agriculture
with days to maturity (r=0 6 p<0 01) and seed M MOHER M JONES AND Y ZHENG School of and Forestry, Brooks, AB, Canada.
protein concentration (r=0 5 p<0 01) Root Environmental Sciences, University of Guelph,
architecture and association mapping studies 50 Stone Road East, Guelph, ON N1G 2W1, Predicting the risk of Fusarium Head Blight
involving these pea lines will further explore Canada; (M.J.) Department of Plant Agricul­ (FHB) disease occurrence in cereal crops
diferent N­fixation mechanisms at interplay in ture, University of Guelph, 50 Stone Road East, is critical for determining the need for and
these lines In the future it may be possible to Guelph, ON N1G 2W1, Canada. timing of fungicide sprays Existing models
pyramid these mechanisms to produce lines for predicting FHB risk de veloped many years
with even greater N fixation capacity With the increased legality of cannabis ago may no longer be suitable for the current
(Cannabis sativa) worldwide there is high Fusarium species complex that has evolved in
95. Fungicide sensitivity of Stemphylium demand to improve production A ma ority Canada Therefore this study aims to develop
vesicarium in Ontario of commercial cultivators opt for a 12 0­hour and validate weather­based risk models
S M STRICKER E MCFAUL B D GOSSEN AND uninterrupted dark period to induce flowering around flowering for predicting FHB index
M R MCDONALD Department of Plant Agricul­ of cannabis plants; however if certain geno­ (FHBi) Fusarium damaged kernels (FDK)

ture, University of Guelph, Guelph, ON N1G 2W1, types can flower under a shorter dark period and deoxynivalenol (DON) in spring wheat
Canada; (B D G ) Agriculture and Agri-Food then longer photoperiods could be used to winter wheat barley and durum across three
Canada, 107 Science Place, Saskatoon, SK S7N improve cannabis yield To determine if the Canadian Prairie provinces Data collected
0X2, Canada. floral initiation of female cannabis explants from 15 sites in western Canada in 2019 and
respond to varied photoperiod female '802' 2020 were used to classify an epidemic at
­1
Stemphylium leaf blight (SLB) caused by explants were grown in vitro for four weeks a 5% FHBi (all crops) or 1 mg kg DON (all
Stemphylium vesicarium (Wallr ) E G Sim­ under one of six photoperiod treatments 12 0 crops) or 0 2 0 3 0 8 and 2% FDK thresholds
mons has become an important disease of 13 2 13 8 14 4 15 0 and 16 0 hours per day for barley spring wheat winter wheat and
onion in Ontario Canada and north­eastern The percentage of flowered explants were durum respectively to develop weather­ba­
USA in recent years Commercial cultivars are highest in the 12 0­ and 13 2­hour treatments sed models for Fusarium epidemics Kendall
highly susceptible so growers apply foliar with 76% and 72% respectively There were correlation and stepwise logistic regression
fungicides at 10-14­day intervals to manage no photoperiod efects on final height growth analysis identified suitable combinations of
the disease However the eficacy of several index or fresh weight These findings suggest temperature (temp) relative humidity (RH)
fungicides has declined over time Isolates of that an uninterrupted dark period of at least precipitation (prec) and solar radiation (SR)
S. vesicarium collected in southern Ontario 10 8 hours (i e 13 2­hour photoperiod) is suit­ at 4 7 10 14 days pre­anthesis and 3 days
from onion asparagus and leek in 2012-2020 able to induce flowering of the '802' genotype pre to 3 days post­anthesis for predicting FHB
were assessed for sensitivity to the technical Further research is required to investigate the risk The weather variables chosen across crop
grade active ingredients of commonly used photoperiodic response on a whole ­plant lev­ types for the FHBi models were RH temp and
fungicides Two isolates collected from oat in el to determine if in vitro studies can be used prec and for the FDK and DON models RH was
Saskatchewan in 1995 provided an historical to determine genotype­specific photoperiods selected Prediction accuracy of the models
baseline The oat isolates were sensitive to to optimiZe production

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