New breakthroughs in management of Rhizoctonia solani AG8
Daniel HüberliM. Connor, K. Gajda, S. Miyan, B. MacLeod, DAFWA, R. Battaglia, L. Forsyth, B. Parkin, T. Klein, Syngenta Australia, M. Clarke, G. Robertson, Bayer CropScience, R. Correll, Rho Environmetrics, J. Desbiolles , University of South Australia, Paul Bogacki, & Alan McKay, South Australian Research and Development Institute
24 February 2015
Outline• What & where is it?• Rotation with canola to manage disease levels• Fungicides – new actives for in-furrow delivery
Management for all soilborne diseases:
– identify what it was last year– respond at or before sowing
What does it look like?
barley > Wheat > oats
Have you looked at the roots?
Spear-tipping on roots
Below detectionLowMediumHigh
Risk levels:
54 / 123 paddocks have medium-high risk so far
184 focus paddocksGRDC project ‘Putting the Focus on Profitable Crop and Pasture Sequencing’
2014*BDLLowModerateHigh
20132012
20112010
PreDicta B pre-sow soil levels of Rhizoctonia in DAFWA’s 184 focus paddocks – last 5 years
GRDC project ‘Putting the Focus on Profitable Crop and Pasture Sequencing’
Rotation can be used to manage Rhizoctonia inoculum & disease
Rhizoctonia levels under different crops
Crop2012 samples 2013 samples
Pre-sow Harvest Pre-sow HarvestWheat 4 82 19 77Barley 8 299 9 14Canola 9 4 43 13Lupin 8 14 14 39Pasture 19 35 21 53
DNA levels (pg DNA/g soil) in pre-sow & harvest soil samples:
Rhizoctonia
inoculum reduced under canola
PreD
icta B risk
High
Med.
BD
L
Low
0
0.5 1
1.5 2
2.5 3
1/6/111/7/11
1/8/11
1/9/11
1/10/111/11/11
1/12/11
1/1/121/2/12
1/3/12
1/4/12
1/5/121/6/12
1/7/12
1/8/121/9/12
1/10/12
R. solani log(pg DNA/g soil+1) 2011 crop:
Barley
Wheat
Canola
Fallow
2011 crops2012 barley
Rhizoctonia disease reduced by canola in barley 2012
0
20
40
60
80
100
Canola Fallow Wheat Barley
Roo
t dis
ease
(%
)
2011 treatment
Root disease
a ab ab b
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Canola Fallow Wheat Barley
Pat
ch a
rea
(sqr
t. m
2 )2011 treatment
Patch area
aab ab b
And cultivation still works!
New in -furrow fungicides• Trials WA (DAFWA) & SA (SARDI & UA)• Evergol® Prime
– Seed & in-furrow– a.i. penflufen
• Uniform®
– In-furrow & split application– a.i. azoxystrobin &
mefenoxam
SA
RD
I, P.
Bog
acki
Liquid banding fungicides: a new way to control root diseases
EverGol ® Prime 40 ml/100 kg seed & 30ml/ha in-furrow
TreatedUntreated
SA
RD
I, P.
Bog
acki
0
0.05
0.1
0.15
0.2
0.25
0.3
Net
yie
ld g
ain
(t/h
a)EverGol ® Prime: combined site analysis (WA & SA) for net treatment yield responses in barley
Yellow p<0.05
$33$52
Net profit: $320/t barley. EP = $145/L
Seed40ml
Seed80ml
IF60ml
IF80ml
IF120ml
Seed 40ml + IF 30ml
Uniform ® 300 ml/ha split application: 50% on surface + 50% in-furrow
TreatedUntreated
SA
RD
I, P.
Bog
acki
Net
yie
ld g
ain
(t/h
a)
Wheat BarleySeed = Vibrance ® 360ml/100 kg seedIF = Uniform ®
IF300ml
IF400ml
IF+Surf150+150ml
IF+Surf200+200ml
Seed +IF 200ml
Seed0
0.1
0.2
0.3
0.4
0.5
0.6
*
*
*
*
*
*
*
**
*
$48
$71 $71$122
Net $: assume $320/t barley. Uni. = $63.30/L
Uniform ®: combined site analysis (WA & SA) for net treatment yield responses in wheat & barley
The next innovation
New GRDC funded project at DAFWA is mapping Rhizoctonia patches
Three key messages• Rotate with canola to reduce Rhizoctonia• In-furrow fungicides provide some control, but
are not a silver bullet• Cultivate 10cm-below-seed (knife points) at
sowing
