14 April2012
2009
August
Volume9,6,Number
Number21
Volume
Crop Watch is distributed for SARDI through Jon Lamb Communications.
Cereals
Pulses
Observations on the Eyre Peninsula last week revealed
stubbles, made by “Blackspot Manager”, are now available
release into sowing periods (red line in graphs) increasing
clear differences in the pathogen populations of NFNB
the risk of blackspot.
at Elliston and Streaky Bay. At Elliston, Maritime was
Blackspot infection on field peas is reduced if pea crops are
severelyafter
affected
and other
varietiesspores
had just
low
levels
planted
the numbers
of airborne
have
reduced.
of infection.Manager’
At Streaky
Bay, growers
Maritimein was
uninfected
‘Blackspot
enables
different
regions of
and
Commander,
Schooner,
Sloop
SA,
Flagship
and
the state to identify the risk of blackspot associated with
particular
sowing
dates.
Fathom were
moderately
infected. These plots are still
Any
communication
the model
South Australia
at the
tillering stageregarding
and so adult
plant inresistance
may
should
be
directed
to
Jenny
Davidson
at
SARDI,
83039389
not be expressing very strongly. This illustrates how
or
[email protected]
variable
NFNB can be. The disease resistance ratings in
website -
Cereals
Rust Status
“Blackspot Manager”
available on website
for 2009
Stripe rust has now been found more widely with a
large 5m diameter hotspot in a crop of Mace at flag
leaf emergence near to Wudinna on the Eyre Peninsula.
Also a Gladius crop has shown infection near to Loxton
Predictions
of blackspot spore release from infected pea
in
the Mallee.
Several
new season
reportsfor
have
fromAustralia.
crops
for the 2009
ten also
sites come
acrossinSouth
in
the Lower
Mid North
including Redhill
(Mace),
Developed
by and
Department
of Agriculture
and Food
Western
Balaklava
(Scout),
Mallala
(Mace)
and
Avon
(Gladius).
Australia (DAFWA), these updates can be accessed at the
Where growers have used flutriafol in furrow, their
http://www.agric.wa.gov.au/cropdiseases
wheat
appears to remain clean of rust. under
These‘Crop
crops
disease forecast 2009’ ‘South Australia’
may well need a late spray to protect their two top
Interpretation of how to use the output is included on
leaves after the early fungicide treatment wears off.
the website.
Mace and Wyalkatchem are also more vulnerable than
The outputs will be updated every 1-2 weeks until mid
other
to infection
thetohead
so early
June, varieties
using current
weather in
data
help and
growers
and
control
is
advisable.
agronomists determine the optimum sowing dates for
field peas.
These first predictions indicate few spores have been
released yet, due to the lack of rain over summer and early
Severe
of net formhas
netcaused
blotchthe
(NFNB)
has been
autumn.infection
Rain in December
blackspot
observed
in
a
crop
of
Fleet
at
Urania.
Whilst
virulence
fruiting bodies to start maturation, and if rain occurs on a
weekly
from now,
then spores
will reach
theirfirst
peak
in
in
Fleetbasis
has been
observed
previously,
this the
time
earlyatowhole
mid May
at has
mostbeen
sitesbadly
(blue line
in graphs).
that
crop
affected.
However, a delay in autumn rains will delay the spore
Net form net blotch
the Sowing and Disease Guides are generally the worst
a variety is expected to perform and some regional
variation may be observed.
Whilst Navigator has rated an MR or MR/MS in NVT
trial plots, we have observed it to be susceptible
to NFNB using a range of isolates in controlled
There
have been
no The
reports
wheatofstripe
or leaf in
rust
environment
tests.
MRofrating
Navigator
the
over-summering
anywhere
in
Australia
to
date.
Stem
rust
Sowing and Disease Guides is therefore likely to be
has
however been
observed
downgraded
in 2013
nearerontovolunteer
an S. cereals in north-
Rusts
ern NSW and southern Western Australia. Barley leaf rust is
Reports
of severe
spottingbarley
in Hindmarsh
likely to be
also
common
on volunteer
in southernare
Western
all due toWhilst
the spot
form
ofimmediate
net blotchrisk
(SFNB)
which
is
Australia.
there
is no
from any
of the
very
much
less
damaging
than
NFNB.
It
is
questionable
rusts in SA, stripe rust is likely to be present in NSW and
rust
spores
can of
travel
large
distances
on thefrom
windfungicide
into
whether
many
these
crops
will benefit
SA
fromas
both
and NSW.are
So,not
despite
the lack of
sprays
theWA
treatments
very effective
in
many
volunteers
SA through
summer
and
early
autumn,
already
infectedincrops
and yield
losses
from
the
disease
growers
should
continue to take precautions to manage
are relatively
minor.
these diseases.
Yellow
leaf spot
Net blotch
Crop Watch is an electronic newsletter service
Recent leaf
glasshouse
testing of adult
plants
with crops
new isolates
provided by SARDI.
Yellow
spot is common
in many
wheat
and
of
net
blotch
has
suggested
that
Hindmarsh
is
similar
in
mostly where wheat is sown into
wheat
stubbles.
Net
blotch
If you would likeCrop
to Watch
receive
this
newsletter
please
is an
electronic
newsletter
service
resistance
as
Keel
to
the
new
NFNB
population
and
not
as plants with new isolates
Recent
glasshouse
testing
of adult
by SARDI.
Some varieties, notably Axe, are also showing
yellows
send your emailprovided
address
to Jon Lamb, Jon Lamb
susceptible as previously feared. The
of suggested
both varieties
of netrating
blotch has
that Hindmarsh is similar in
If you
would like to receive this newsletter please
symptoms
which can be confused
with
yellow
leaf
spot
[email protected]
Communications
resistance
Keel as
to the
new NFNB population
and not as
as adult plants is probably MS and
not asasbad
Barque
send
your
email address to Jon Lamb, Jon Lamb
from a distance. These latter symptoms
display
"Crop Watch
request"
.
susceptible astypically
previously feared.
The rating- oftitled
both varieties
Communications [email protected]
has been to the previously predominant
strain.
Baudin
on
plants is probably MS and not as bad as Barque
as yellowing back from the leaf astipadult
and
are not caused
- titled "Crop Watch request".
the other hand is clearly quite susceptible
new predominant strain. Baudin on
has been toto
thethe
previously
by
any disease
whereas
leaf
spot
yellow
the
other
handhas
is clearly
susceptible to the new
population
and should
not yellow
be grown
where
NFNB
isquite
a risk.
population
and lower
should not
be grown where NFNB is a risk.
lesions with tan centres scattered
across
leaves.
Most varieties will be susceptible Most
as seedlings
the as seedlings to both the
varieties will to
be both
susceptible
older Fleet
and new
populations
NFNB. Fleet has shown good
older and new populations of NFNB.
has
shown ofgood
to both populations at the seedling and adult
resistance to both populations at resistance
the seedling
and adult
plant stages in growth room tests.
plant stages in growth room tests.
Pulses
Faba bean diseases increasing
Rust on faba beans has been observed in the Mid
North of South Australia and also in Victoria, and
chocolate spot on faba beans has been observed
on Eyre Peninsula. These diseases will continue to
increase, particularly as temperatures are reaching
20°C. Fungicides will be necessary to control diseases
and reduce yield loss. Earlier sprays show a better
response to disease control.
FEEDBACK WELCOME
The SARDI Pathology team invites you to
contribute to this publication by reporting local
observations or commenting on items in
the newsletter.
FEEDBACK WELCOME
Comments
should go
to: to
The SARDI Pathology
team invites
you
Hugh Wallwork
(cereals) local
contribute to this publication
by reporting
[email protected],
observations orJenny
commenting
on items in
Davidson (pulses and oilseeds)
the [email protected]
newsletter.
with a copy to Jon Lamb Communications
Comments
should
go to:
[email protected]
Hugh
Wallwork
(cereals)otherwise the name
Unless
specifically requested
[email protected],
and location and/or company of the reporter may
be included with published comments.
Jenny Davidson
(pulses and oilseeds)
Reports, particularly of early sightings of rusts or
[email protected]
where diagnosis is not certain, would have added
value
if accompanied
by a paper-packed sample.
Jon
Lamb Communications
with a copy to
Please do not send samples in plastic bags.
[email protected]
Comments
should go
to:
Unless specifically
requested
otherwise
the name
and location and/or company of the reporter may
Hugh Wallwork (cereals)
be included with published comments.
FEEDBACK WELCOME
The SARDI Pathology team invites you to
contribute to this publication by reporting local
observations or commenting on items in
the newsletter.
Unless specifically requested otherwise the name
and location and/or company of the reporter may
be included with published comments.
Reports, particularly of early sightings of rusts or
where diagnosis is not certain, would have added
value if accompanied by a paper-packed sample.
Please do not send samples in plastic bags.
[email protected],
Reports, particularly of early sightings of rusts or
where
diagnosis
is not(pulses
certain,and
would
have added
Jenny
Davidson
oilseeds)
value if accompanied
by
a
paper-packed
sample.
[email protected]
Please do not send samples in plastic bags.
with a copy to
Jon Lamb Communications
[email protected]