2011 cereal rust update - western australia acrcp meeting – march 2012 manisha shankar & geoff...
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2011 Cereal Rust Update - Western Australia
ACRCP Meeting – March 2012
Manisha Shankar & Geoff Thomas
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• 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
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2012 Wheat Rust Disease Reports in Western Australia
2011 Wheat leaf rust 2011 Wheat stripe rust
2011 Wheat stem rust
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2011 Barley leaf rust 2011 Oat, stem and leaf rust date
2012 Barley and Oats Rust Disease Reports in Western Australia
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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
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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)
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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
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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)
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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
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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