Cereal rust corner

Fungicide spraying in WA

Cereal rust in season 2000 — what happened?

With Dr Robert Park and Dr Colin Wellings, University of Sydney (Dr Wellings is seconded from NSW Agriculture

Cereal rusts were widespread in 2000 despite below-average winter and early spring rainfall across much of the Australian cereal-growing region.

Stem rust

There was a significant increase in the incidence of wheat stem rust in WA. Substantial yield losses were anticipated in some cases and pathotypes virulent for the gene Sr6 (Cadoux, Halberd, Spear) were more common.

In eastern Australia, stem rust was observed in the Mallee in early August, however it remained at generally low levels. There were reports of higher than expected levels of stem rust in several crops of Yitpi in SA and Victoria.

Leaf rust

Wheat leaf rust was severe to moderately severe in parts of WA, and widespread in eastern Australia. Of significance was the development of pathotype 104-1,2,3,(6),(7),11+Lr24, detected in SA, southern NSW and recentiy from one site in southern Queensland (see Cereal Rust Corner, Ground Cover, Summer 2000).

This pathotype is of potential significance for cultivars such as Janz, Krichauff, Nyabing and Sunco. However, further information is needed to fully appraise the danger it poses in 2001. Growers are encouraged to contact district advisory officers for the latest information in regard to variety choices for the current season.

Stripe rust

Low levels of wheat and barley grass stripe rusts occurred throughout eastern Australia in 2000.

Region North