Sydney, Australia
August 2, 2007
University of Sydney
Plant
Breeding Institute (PBI)
Cereal Rust Laboratory
Cereal Rust Report Season 2007
Volume 5, Issue 1, 2 August 2007
Colin Wellings*, Robert Park and Harbans Bariana
The University of Sydney, Plant Breeding Institute
*(on secondment from NSW Department of Primary Industries)
Email:
colinw@camden.usyd.edu.au
Ph: 02-9351 8826, Mobile: 0424 093 236
Rust Alert
The 2007 winter cereal season has
begun well across the majority of regions in eastern Australia
(NSW, Victoria,
South Australia) and WA (southern districts) with adequate
autumn rainfall allowing timely sowing and in some
cases replenishing sub-soil moisture reserves. Crop
establishment has generally been above average in these
areas although some localities have struggled with water
logging. In contrast the central and northern areas of WA and
parts of southern Queensland remained dry in the period ending
31 May, delaying sowing operations.
First Report of Wheat Stripe
Rust
Two samples of stripe rust on wheat were received at PBI on
24th July. The sample from wheat (Condamine, Queensland) was
scant, although the sample from triticale (Bingara, northern
NSW) was more substantial. The samples have been transferred to
susceptible wheats in order to establish cultures that will then
be assessed for pathotype identity. Although the pathotype of
these samples has not been identified, it is expected that the
northern location of these first reports will likely yield the
dominant WA pathotype, 134 E16 A+. There have
been no reports of stripe rust on the Yr17 varieties as at the
time of writing. Field nurseries at PBI are currently in the
early tillering stage. The new pathotype (134 E16 A+ Yr17+) is
establishing in these nurseries and data on
disease response will be distributed as soon as possible.
Other Rust Samples
A number of rusted grass samples have been received at the PBI
Rust Laboratory in the period April to June 2007. The obvious
concern from cooperators was the possibility that these grasses
could be supporting inoculum build up of cereal rusts in the
early phase of cereal crop establishment. Samples were
accessioned and transferred to a range of susceptible cereal
test varieties, including barley, oats, wheat and rye. In each
case, no rust culture could be established, confirming that
these grass rusts were not supporting cereal rust pathogens.
The grass samples that were collected and dispatched were
largely from Phalaris spp and one Fescue sample. The rusts on
these naturalized grasses were likely forms of Puccinia coronata
although P. brachypodii was also a possible candidate. Wheat
stem rust (P. graminis tritici) and wheat stripe rust (P.
striiformis tritici) have in the past been recorded on Phalaris
in Australia.
Cereal rust samples may be
collected and posted in paper envelopes to the following
address:
Australian Cereal Rust Survey
Plant
Breeding Institute
Private Bag 11
Camden NSW 2570
The Australian Cereal Rust
Control Program is supported by growers through the Grains
Research & Development Corporation.
Original report:
http://www.seedquest.com/News/releases/2007/pdf/19975.pdf
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