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

Questions?

daniel.huberli@agric.wa.gov.au9368 3836