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International Society for Infectious Diseases

Date: Tue 12 Jun 2018
Source: Queensland Country Life [edited]
Plant pathologists identified new strains of stripe rust from samples
sent in last year [2017] from Victoria. The new rust pathotype is
believed to be the first [to overcome] the YR 33 gene which has formed
an important part of plant resistance to stripe rust in several widely
grown wheat varieties.
It [also] marks the 1st time a new stripe rust pathogen has been
identified [in Australia] for 7 years. While farmers are not expecting
a high disease load this year [2018] due to the dry summer and autumn
meaning lack of a green bridge for rust to survive on, [they] are
encouraged to closely monitor for rust.
The samples [were] part of the Australian Cereal Rust Survey, a Grains
Research and Development Corporation (GRDC) investment. Dr Grant
Hollaway, Agriculture Victoria, said farmers should continue to
participate in the survey to help detect any changes in rust
pathogens. "Stripe rust found on any variety of wheat should be
submitted for pathotype analysis [which] enables industry to be on the
front foot with potential rust outbreaks and the detection of new
pathotype mutations and incursions as soon as they occur."

[Byline: Gregor Heard]
Communicated by:
[Stripe rust (also called yellow rust) of cereals is caused by the
fungus _Puccinia striiformis_. The disease affects wheat (_Triticum
aestivum_), durum wheat (_T. turgidum_), some barley varieties,
triticale (wheat/rye hybrids) and a number of wild grasses. It causes
yellow stripes on leaves which leads to loss of photosynthetic ability
and plant vigour, as well as stunting of plants. Yield losses of 40 to
100 per cent have been reported in wheat.
Spores are wind dispersed in several cycles during the cropping
season. Grasses and volunteer crop plants may generate a "green
bridge", providing inoculum for the next crop cycle. Disease
monitoring is important so that timely action can be taken to limit
the spread of the pathogen as well as build-up of inoculum. Disease
management may include the use of resistant varieties, fungicide
applications and control of pathogen reservoirs. Monitoring and
resistance breeding programmes have been established in different
regions for early detection of new rust strains and to attempt to stay
ahead of pathogen evolution.
While stem rust (_Puccinia graminis_) poses a huge potential threat to
world wheat production, stripe rust is currently causing the most
damage to wheat crops on a global scale. New strains of both rusts
with increased virulence and additional fungicide resistances have
been reported in recent years from wheat-growing areas worldwide.
Climate warming allowing survival of wheat rusts on green bridges into
higher latitudes is another example of pathogens extending their range
due to climate change (see also ProMED-mail posts,,, Projects for double
resistance breeding to manage both stripe and stem rusts
simultaneously are in progress (see ProMED-mail post
Australia (with states):
and <>
Stripe rust symptoms on wheat:
and <>
Stripe rust on barley:
<> and
Ryegrass with stripe rust:
and <>
Additional news story:
Information on wheat stripe rust:
and <>
_P. striiformis_ life cycle:
Stripe rust global tracking, current race analysis & distribution:
<>, and
_P. striiformis_ taxonomy and synonyms:
and <>
Global Rust Initiative:
- Mod.DHA]
[See Also:
Stripe rust, wheat - India: (PB) alert
Stripe rust, wheat - UK: (02) Red 24 & Blue 7, new strains
Stripe rust, wheat - UK: new strains
Stripe rust, wheat - Canada, USA
Stripe rust, durum wheat - Mexico: new strain
Stem & stripe rusts, wheat - Europe, Asia, Africa: new races
Stripe, stem & leaf rusts, wheat - Ethiopia
Stripe rust, wheat - UK (02): new strains susp
Stripe rust, wheat - USA: new strains susp
Stripe rust, wheat - UK: Kranich strain, 1st rep
Stripe rust, wheat - India: (PB) alert
Stripe rust, wheat - Europe: origin of strains
Fusarium head blight & stripe rust, wheat - USA: (MO)
Stripe rust, wheat - USA: (NE)
Stripe rust, wheat - Pakistan, Mexico
Stripe rust, wheat - India: (JK)
Stripe rust, cereals - France
Stripe rust, wheat - Spain: (CL) Warrior strain
Stripe rust, wheat - UK: Warrior strain, alert
Stripe rust, wheat - India: (PB, HR)
Stripe rust, barley - Australia: (NS)
Fungal diseases, cereals - Australia: (eastern, south) alert
and additional items on stripe rust in the archives]
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