Download PestFax Issue 15, July 2016 - Department of Agriculture and Food

PestFax Issue 15, July 2016
1 of 9
https://www.agric.wa.gov.au/print/node/5739
Jul 2016
Mostly low levels of powdery mildew reported this week
Net blotch in susceptible barley varieties
Barley leaf rust in the south
Sclerotinia appearing in northern agricultural areas
Some aphids and mites about
Wheat powdery mildew
Dalwallinu
Danjinning
Geraldton
Kulinbah
Morawa
Moningarin
Nukarni
Wyola
Yorkrakine
There have been reports of low levels of powdery mildew in many wheat crops this week. Matt Willis (Elders)
has found low levels of the disease in tillering Calingiri wheat at Wyola and Yorkrakine as well as booting
Calingiri at Moningan, while Ciara Beard (DAFWA) has received reports of powdery mildew in some crops in the
Morawa area. Last week she found the disease just starting in nil treatment trial plots she inspected at Geraldton
and Dalwallinu. Her trial at Geraldton is investigating early fungicide treatments such as seed dressings and
in-furrow compared to Z31 growth stage foliar spray for disease control. This week she has found the disease
has progressed quickly up the canopy in nil treatment plots and is also starting to show in all plots including
those treated with fungicide at seeding. Ty Henning (TekAg) has reported a Mace wheat crop at stem elongation
with less than 10% powdery mildew in Kulinbah as well as an early sown Mace crop at milk stage with
widespread infection in Danjinning. Geoff Thomas (DAFWA) has reported seeing low levels of powdery mildew
in Zen wheat (Z31/32) at Nukarni.
22/07/2016 11:07 AM
PestFax Issue 15, July 2016
2 of 9
https://www.agric.wa.gov.au/print/node/5739
Wyalkatchem wheat from trial at Wooree, near Geraldton, with powdery mildew infection, 20th July.
It appears the recent cold weather has slowed disease progression in some areas but growers need to be
vigilant as the weather warms up (15–22°C) if the humidity is high, as the disease can quickly move up the
canopy and it is crucial to control before it becomes severe and develops in upper canopy and heads.
For more information on diagnosing and managing powdery mildew in wheat refer to DAFWA’s:
Powdery mildew in barley and wheat article PestFax Issue 12
Diagnosing powdery mildew in cereals page
Powdery mildew in wheat YouTube video.
For more information contact Ciara Beard, Plant Pathologist, Geraldton on +61 (0)8 9956 8504 or Geoff
Thomas, Plant Pathologist, South Perth on +61 (0)8 9368 3262.
Barley powdery mildew in some areas
Dalwallinu
Lower Great Southern
West Kendenup
Woolocutty
Joe Delaney (Elders) has found low levels of barley powdery mildew on tillering Mundah barley plants that are
stressed from waterlogging in Dalwallinu. Blakely Paynter (DAFWA) also reports finding a scattered infection of
the disease in tillering Baudin while inspecting crops at Woolocutty. Kith Jayasena (DAFWA) reports Baudin
barley at Z25 with powdery mildew at west Kendenup. This is the first crop with the disease he has seen in the
region this year. He has spore traps at nine sites in the lower Great Southern and has been detecting powdery
mildew spores in them since 22 June.
22/07/2016 11:07 AM
PestFax Issue 15, July 2016
3 of 9
https://www.agric.wa.gov.au/print/node/5739
Joe Delaney (Elders) provided this photo of the powdery mildew infection in Mundah barley affecting stressed
plants in Dalwallinu.
As with wheat powdery mildew growers need to be vigilant if mild, humid conditions of 15-22°C and over 70%
humidity persist.
For additional details visit the DAFWA pages:
Powdery mildew in barley article in PestFax Issue 11
Diagnosing powdery mildew in cereals
Management of barley powdery mildew in 2016 - fungicide resistance.
Registered foliar fungicides for cereals in Western Australia
For more information contact Geoff Thomas, Plant Pathologist, South Perth on +61 (0)8 9368 3262 or Kith
Jayasena, Plant Pathologist, Albany on +61 (0)8 9892 8477.
Hyden
Tambellup
Blakely Paynter (DAFWA) has found all susceptible varieties of barley in national variety trials at Hyden with
spot-type net blotch infection. He reports inspecting plots of tillering GrangeR barley with between 30-60%
infection levels. Kith Jayasena (DAFWA) reports both spot-type and net-type net blotch in Flinders barley in
Tambellup.
Distinctive brown circular lesions of spot-type net blotch
22/07/2016 11:07 AM
PestFax Issue 15, July 2016
4 of 9
https://www.agric.wa.gov.au/print/node/5739
When managing net blotches in barley the crop should continue to be monitored for further development of the
disease and in crops where disease continues to progress, an application of a registered fungicide leading up to
stem extension can help reduce epidemic development.
It is important that samples of net blotch are sent for pathotype testing. Net blotch leaf samples should be mailed
in paper envelopes to Jason Bradley, Plant Pathology, DAFWA, Locked Bag 4, Bentley Delivery Centre WA
6983.
For further information on symptoms and management of net blotches, see DAFWA’s Diagnosing spot-type net
blotch and Managing spot-type net blotch in continuous barley.
For more information on barley diseases contact Kithsiri Jayasena, Plant Pathologist, Albany on +61 (0)8 9892
8477 or Geoff Thomas, Plant Pathologist, South Perth on +61 (0)8 9368 3262.
Esperance
Pallinup
Tambellup
Andrea Hills (DAFWA) reports Baudin barley at Z33/34 stage with leaf rust on the fourth leaf. As Baudin is rated
very susceptible to leaf rust it will be sprayed with prothioconazole 210g/L + tebuconazole 210g/L at flag -1
emergence. Other barley varieties she inspected had rust at lower levels and will be monitored to see if the
disease develops with warmer weather as the disease develops rapidly in moist conditions when temperatures
are between 15-22°C. Kith Jayasena (DAFWA) has also found leaf rust in the Flinders barley at Tambellup in
which he reported finding spot-type and net-type net blotch. He also reports barley leaf rust on Bass barley (Z33)
at Pallinup which was initially treated with Hombre seed dressing. Kith comments that growers should spray any
infections early because if the disease gets away it is difficult to manage.
More detailed information about barley leaf rust can be found at DAFWA’s:
More barley leaf rust reported article in PestFax Issue 12.
Diagnosing barley leaf rust page
Barley leaf rust YouTube video.
The Sydney University, Australian Cereal Rust Survey has pathotype analysis underway on samples received
from early rusts in volunteers and crops, with results available for the earliest sample received, which was off
volunteer Bass barley from Pallinup in March. This information can be found at Cereal rust situation, July 2016
with earlier issues found at Cereal rust reports.
For more information contact Kithsiri Jayasena, Plant Pathologist, Albany on +61 (0)8 9892 8477
East Chapman
Merredin
Walkaway
Ciara Beard (DAFWA) reports finding sclerotinia in a 404 canola crop which was at 30% bloom in Walkaway.
Symptoms appear as water soaked grey lesions on leaves and some leaves are broken and have fluffy white
growth. Apothecia are still present at the site. The crop has now been sprayed to assist in preventing any further
22/07/2016 11:07 AM
PestFax Issue 15, July 2016
5 of 9
https://www.agric.wa.gov.au/print/node/5739
infections. In a grower's 404 canola crop at east Chapman she has found stem infection starting with the crop at
60% bloom. Ciara has trials at both sites looking at different products for optimal disease control. In a separate
trial at east Chapman which is at 50% bloom she has found leaf symptoms just starting.
Stem infection of sclerotinia in 404 canola at East Chapman reported by Ciara Beard (DAFWA).
Sclerotinia infection in Ciara Beard's trial plots.
Doug Abrecht (DAFWA) reports that sclerotinia was also identified the week of 21-28 June in Nuseed GT50
canola seeded on 5 April 2016 at Merredin Research Station. There was also evidence of a low level of blackleg
lesions on the leaves. At the time 30% of the canola plants were flowering, some had pods 20-40mm long and
the crop was 800-1000mm high. Sclerotinia infection was identified on leaves in the lower third of the canopy
with some infections clearly related to petals which had dropped onto leaves. There was no evidence of infection
in canola sown on 22 April (budding start of stem elongation) or 25 May (4-5 leaves) in the same trial. The
infected crop was sprayed with 400mL/ha Prosaro in 100L/ha water on 5 July using a ute mounted boom spray
with low drift nozzles. Inspections of the sprayed plots on 11 July and 18 July have revealed that the infection
was no longer active.
More detailed information on sclerotinia can be found at:
Further updates on sclerotinia in canola article in PestFax issue 14
Sclerotinia in canola update 2016 YouTube video
Managing sclerotinia stem rot in canola page.
For more information contact Ravjit Khangura, Senior Plant Pathologist, South Perth +61 (0)8 9368 3374.
Russian wheat aphid update
The good news continues that Russian wheat aphid has not been found in Western Australia since the
beginning of June, when it was first declared to be present in South Australia and Victoria. Growers and
consultants are urged to continue to report cereal crops which have been inspected and where no aphids were
found. Likewise, please report any aphids found especially those suspected to be Russian wheat aphids.
For more information on the Russian wheat aphid, including what to look for in crops and how to report, refer to
DAFWA’s Russian wheat aphid page and Recognising Russian wheat aphids in crops YouTube video.
Bluegreen aphids
Manmanning
Tyronne Henning (TekAg) reports finding bluegreen aphids infesting 20-40% of a flowering bisurella crop in
22/07/2016 11:07 AM
PestFax Issue 15, July 2016
6 of 9
https://www.agric.wa.gov.au/print/node/5739
Manmanning. The crop will be sprayed with 250mL/ha chlorpyriphos + 150mL/ha alphacypermethrin.
Over 20% of the bisurella crop was infested with bluegreen aphids Ty Henning (TekAg) reports.
For more information refer to Cesar Australia's Bluegreen aphid PestNote and the Bluegreen aphids article in
PestFax issue 14.
Oat aphids
Benjaberring
Jenabillup
Kirkdune
Moora
Tambellup
Low levels of oat aphids in a Benjaberring Mace wheat crop at stem elongation have been reported by Matt
Willis (Elders). Jeremy Curry (DAFWA) has found Mace wheat at stem elongation in an agronomy trial at
Jenabillup with 20-40% tillers infested with oat aphids, while Tyronne Henning (TekAg) has inspected a Calingiri
wheat crop at the same growth stage in Kirkdune with under 10% oat aphid infestation. While inspecting trials at
Moora and Tambellup, Geoff Thomas (DAFWA) has found very low levels of oat aphids.
Oat aphids vary in colour from olive-green to black and have a rust-red back on their rear end.
For information on spraying insecticides refer to the DAFWA's Insecticides for control of cereal aphids.
For further reading on cereal aphids refer to the DAFWA pages:
Diagnosing cereal aphids
Aphid feeding damage to cereal crops
22/07/2016 11:07 AM
PestFax Issue 15, July 2016
7 of 9
https://www.agric.wa.gov.au/print/node/5739
Aphids in crops YouTube video.
Turnip aphids
Nalkain
Matt Willis (Elders) has inspected a Sturt canola crop at early flowering in Nalkain with up to 10% of flower
spikes on the edge of the paddock having 5-6 turnip aphids per bud.
As spring temperatures warm up, aphid numbers can be expected to increase in crops. Regular monitoring will
indicate if aphid numbers are increasing in your crop.
If more than 20% of plants are infested with colonies of turnip or cabbage aphids and aphid numbers are
expected to increase, control measures should be considered to avoid yield losses. If spraying, consider options
such as the aphicides pirimicarb or sulfoxaflor that are soft on the beneficial insects including parasitic wasps,
hover flies, lacewings and ladybirds. For more information refer to DAFWA’s Winter Spring Insecticide Guide
2016.
For more information on canola aphids and their management see the DAFWA pages:
Aphids are in canola article in PestFax Issue 14
Aphid management in canola crops
Diagnosing canola aphids
Aphids in crops YouTube video.
Blue oat mite
Southern Brook
While inspecting crops in Southern Brook Matt Willis (Elders) reports finding a few blue oat mite in a Mace wheat
crop at stem elongation.
At this time of the season, crops are advanced and feeding damage caused by mite and lucerne flea are usually
of no consequence. However, in some uncommon situations when they have built up to very high numbers, blue
oat mite have been seen causing significant leaf surface damage to cereal crops.
More information on blue oat mite can be found at:
Diagnosing blue oat mite
Blue oat mites in PestFax Issue 14
For more information contact Dusty Severtson, Entomologist, South Perth on +61 (0)8 9368 3249 or Svetlana
Micic, Entomologist, Albany on +61 (0)8 9892 8591.
All Page Links
[1] https://www.agric.wa.gov.au/sites/gateway/files/Powdery%20mildew%20Ciara%20Beard_1.jpg
[2] https://www.agric.wa.gov.au/newsletters/pestfax/pestfax-issue-12-july2016?page=0%2C6#smartpaging_toc_p6_s0_h2
[3] https://www.agric.wa.gov.au/mycrop/diagnosing-powdery-mildew-cereals
[4] https://www.youtube.com/watch?v=hsFoZ7wyuaM
[5] mailto:[email protected]
22/07/2016 11:07 AM
PestFax Issue 15, July 2016
8 of 9
https://www.agric.wa.gov.au/print/node/5739
[6] mailto:[email protected]
[7] https://www.agric.wa.gov.au/sites/gateway/files/Powdery%20mildew%20barley%20Joe%20Delaney.jpg
[8] https://www.agric.wa.gov.au/newsletters/pestfax/pestfax-issue-9-june2016?page=0%2C4#smartpaging_toc_p4_s0_h2
[9] https://www.agric.wa.gov.au/barley/management-barley-powdery-mildew-2016-fungicide-resistance
[10] https://www.agric.wa.gov.au/barley/registered-foliar-fungicides-cereals-western-australia
[11] mailto:[email protected]
[12] https://www.agric.wa.gov.au/sites/gateway/files
/Spot%20type%20net%20blotch%20Blakely%20Paynter_0.jpg
[13] mailto:[email protected]
[14] https://www.agric.wa.gov.au/mycrop/diagnosing-spot-type-net-blotch
[15] https://www.agric.wa.gov.au/barley/managing-spot-type-net-blotch-continuous-barley
[16] https://www.agric.wa.gov.au/newsletters/pestfax/pestfax-issue-12-july2016?page=0%2C5#smartpaging_toc_p5_s0_h2
[17] https://www.agric.wa.gov.au/mycrop/diagnosing-barley-leaf-rust
[18] https://www.youtube.com/watch?v=J-wLK2QKPJM
[19] http://sydney.edu.au/agriculture/documents/pbi/cereal_rust_report_2016_14_5.pdf
[20] http://sydney.edu.au/agriculture/plant_breeding_institute/cereal_rust/reports_forms.shtml
[21] https://www.agric.wa.gov.au/sites/gateway/files/Sclerotinia%20East%20Chapman%20Ciara%20Beard_0.jpg
[22] https://www.agric.wa.gov.au/sites/gateway/files/Sclerotinia%20trial%20plots%20Ciara%20Beard_0.jpg
[23] https://www.agric.wa.gov.au/newsletters/pestfax/pestfax-issue-14-july2016?page=0%2C5#smartpaging_toc_p5_s0_h2
[24] https://www.youtube.com/watch?v=OwAe12QEYMw
[25] https://www.agric.wa.gov.au/canola/managing-sclerotinia-stem-rot-canola
[26] mailto:[email protected]
[27] https://www.agric.wa.gov.au/barley/biosecurity-alert-russian-wheataphid?page=0%2C0#smartpaging_toc_p0_s8_h2
[28] https://www.youtube.com/watch?v=9GSiUTu7NU0
[29] https://www.agric.wa.gov.au/sites/gateway/files
/Bluegreen%20aphids%20bisurella%20Manmanning%20Ty%20Henning%20%28TekAg%29_0.jpg
[30] http://www.cesaraustralia.com/sustainable-agriculture/pestnotes/insect/Bluegreen-aphid
[31] https://www.agric.wa.gov.au/newsletters/pestfax/pestfax-issue-14-july2016?page=0%2C3#smartpaging_toc_p3_s1_h3
[32] https://www.agric.wa.gov.au/sites/gateway/files
/Oat%20aphids%20Jenabillup%20Mace%20Jeremy%20Curry%20%28DAFWA%29%203_0.jpg
[33] https://www.agric.wa.gov.au/barley/insecticides-control-cereal-aphids
[34] https://www.agric.wa.gov.au/mycrop/diagnosing-cereal-aphids
[35] https://www.agric.wa.gov.au/barley/aphid-feeding-damage-cereal-crops
[36] https://www.youtube.com/watch?v=RFoJaBFxTg8
[37] https://www.agric.wa.gov.au/sites/gateway/files/Winter%20Spring%20Insecticide%20Guide%202016.docx
[38] https://www.agric.wa.gov.au/newsletters/pestfax/pestfax-issue-14-july2016?page=0%2C1#smartpaging_toc_p1_s0_h2
[39] https://www.agric.wa.gov.au/pest-insects/aphid-management-canola-crops
[40] https://www.agric.wa.gov.au/mycrop/diagnosing-canola-aphids
[41] https://www.agric.wa.gov.au/mycrop/diagnosing-blue-oat-mite
[42] https://www.agric.wa.gov.au/newsletters/pestfax/pestfax-issue-14-july2016?page=0%2C0#smartpaging_toc_p0_s3_h3
[43] mailto:[email protected]
[44] mailto:[email protected]
Source URL: https://www.agric.wa.gov.au/newsletters/pestfax/pestfax-issue-15-july-2016
22/07/2016 11:07 AM
PestFax Issue 15, July 2016
9 of 9
https://www.agric.wa.gov.au/print/node/5739
This print version was generated at 10:33am on the 22nd of July, 2016.
The original document was last revised at Fri, 22/07/2016 - 10:32am
Important disclaimer
The Chief Executive Officer of the Department of Agriculture and Food and the State of Western Australia accept
no liability whatsoever by reason of negligence or otherwise arising from the use or release of this information or
any part of it.
22/07/2016 11:07 AM