Australian Cereal Rust Control Program - Continued monitoring of cereal rust pathogens in Australia

Abstract

The GRDC funded survey project monitored national rust pathotype incidence and distribution (changes) through samples received and regular crop inspections for wheat, barley and oats in seven agroecological zones in Australia; NNNSW, SNNSW, Qld, Vic, WA, SA, Tasmania between 2017 – 2022 . Pathotypes were determined using virulence testing of host differential seedlings in greenhouse tests. Disease assessments followed the “0”-“4” infection type scoring system (Stakman scale). Fungicide insensitivity test was conducted by testing isolates received from surveys plus control isolates collected prior to the advent of fungicides against different concentrations of tebuconazole. The sensitivity of five pathotypes (pts) was tested with 7 treatments (amounts of orius [ml] / [m2]). Information of the rust samples sent to PBI is stored in the Rust DB that is hosted on a FM 19 server at the University of Sydney (fmsapa0f274.shared.sydney.edu.au). Summaries of the frequencies of pathotypes isolated for wheat leaf rust, wheat stem rust, wheat stripe rust, barley leaf rust, barley stem rust, oat crown rust and oat stem rust are stored in the RDS folder of the project \\shared.sydney.edu.au\research-data\PRJ-ACRCP_Survey.