2011 Cereal Rust Update - Western Australia

ACRCP Meeting – March 2012

Manisha Shankar & Geoff Thomas

• Wheat– Stripe rust: 3 reports only (Sep-Oct), minimal reports for

last 4 years– Leaf rust: Several reports VS & S older variety types– Stem rust: Late widespread development Great

Southern, South Eastern and Southern regions (Oct). Fungicides used. Primarily S types affected.

• Barley– Leaf rust: South and south coastal. Currently the most

problematic rust disease on cereals in WA. Significant fungicide usage for powdery will have reduce BLR expression.

• Oat– Leaf and stem rust: reported from September onwards.

Western Australia

2012 Wheat Rust Disease Reports in Western Australia

2011 Wheat leaf rust 2011 Wheat stripe rust

2011 Wheat stem rust

2011 Barley leaf rust 2011 Oat, stem and leaf rust date

2012 Barley and Oats Rust Disease Reports in Western Australia

Carnarvon - Disease establishment (4.9 hectares)

Planting Outer and inner buffer runs planted by first week of April Main planting - first week of May

1st Inoculation (last week of May) Stem rust pathotypes 34-1,2,7+Sr38 and 98-1,2,3,5,6,7

2nd Inoculation (mid-June) Leaf rust pathotype 104-1,2,3,(6),(7),11 +Lr37 Re-inoculation with both stem rust pathotypes

Good establishment of all three pathotypes by mid August Trident: 60 - 70% leaf and stem rusts Wyalkatchem: 80% stem rust

Planting Two buffer runs of Harrismith planted by third week of May Main planting - third week of June

1st Inoculation (3rd week of July): 134 E16 A+ 2nd Inoculation (3rd week of August) Good establishment of stripe rust by 2nd week of

October Harrismith: 70-80% stripe rust EGA Bonnie Rock: 70-80% stripe rust

Manjimup - Disease establishment (~4 hectares)

Yitpi / stem rust found at mid booting? (Gibson 2011)

. DOS: 10 June

. T1 =1 Sept (Z45)

. T2 = 23 Sept (Z61)

. 1st visible symptoms on 31 Aug at Z45

0

23

30

30

30

39

56

0 10 20 30 40 50 60

Untreated

Tilt @ 500 mL/ha at T1

Tilt Xtra @ 500 mL/ha at T1

Prosaro @ 300 mL/ha at T1

Folicur @ 290 mL/ha at T1

Folicur @ 290 mL/ha at T2

Folicur @ 290 mL/ha at T1 & T2

% Yield increase over untreated

(1.59 t/ha)

(1.96 t/ha)

(2.07 t/ha)

(2.22 t/ha)

(2.48 t/ha)

(2.07 t/ha)

(2.07 t/ha)

lsd (5%) = 0.1

0

23

30

30

30

39

56

0 10 20 30 40 50 60

Untreated

Tilt @ 500 mL/ha at T1

Tilt Xtra @ 500 mL/ha at T1

Prosaro @ 300 mL/ha at T1

Folicur @ 290 mL/ha at T1

Folicur @ 290 mL/ha at T2

Folicur @ 290 mL/ha at T1 & T2

% Yield increase over untreated

(1.59 t/ha)

(1.96 t/ha)

(2.07 t/ha)

(2.22 t/ha)

(2.48 t/ha)

(2.07 t/ha)

(2.07 t/ha)

lsd (5%) = 0.1

Jayasena - DAFWA

$399

$111

$83

$63

$63

$57

Folicur @ 290 mL/ha Sprayed at Z45 (1 Sept) & Z61 (23 Sept)

Unsprayed

Stem rust control on Yitpi wheat at Gibson 2011Sprayed vs Unsprayed – Z90

(Jayasena, DAFWA)

SprayedUnsprayed

T1&T2 F

T1&T2 F

T1PT2 F

UT

T1Tx

Late application of fungicides can reduced grain discolouration associated with saprophytic fungi on wheat at Gibson, Z90 (4 Nov 2011)

Jayasena (DAFWA)

Time 1 spray= T1 at Z45 (1 Sept)

Time 2 spray =T2 at Z61 (23 Sept)

F = Folicur @ 290 mL/ha

P = Prosaro @ 300 mL/ha

Tx = Tilt Xtra @ 500 mL/ha

UT = Untreated

Above average rainfall through much of wheatbelt between Nov 2011-Jan 2012 raises spectre of green bridge carryover of rust inoculum.BOM rainfall outlook suggests continuing wetter than average, potentially supporting green regrowth and rust inoculum

2011-12 Seasonal Update Western Australia

WA rainfall deciles 1 Nov 2011 – 31 Jan 2012 Chance of exceeding median rainfall Feb-April 2012