Publication Date

1990

Document Type

Report

DAFWA Collections

Biosecurity, pests, weeds and diseases

Abstract

Trial 90PE10

Strategic variety mixtures to reduce septoria diseases of wheat. Evaluation of wheat lines for suitability to mixing for septoria control.

Location: Mt. Barker Research Station

To determine components of partial resistance to both Septoria species to ensure that lines with components that are complimentary are chosen for evaluation as mixtures for Septoria control.

Trial 90MT12 and 90ME10

Assessing effects of a paired variety mixture to reduce Septoria.

Location: Borden and Mt Barker Research Station.

To assess the effects of a variety mixture on Septoria diseases.

Trial 90MT11 and 90JE9

Evaluating variety mixtures to reduce septoria, using a range of crossbreds.

Location: Mt. Barker Research Station

To identify varietal combinations from a range of genotypes for using in mixtures to reduce Septoria diseases.

Trial 90BA50 and 90MT60

Mixing varieties with a range of maturities for possible disease and agronomic benefits.

Location: Badgingarra Research Station and Mt Barker Research Station.

To evaluate disease control and other agronomic effects from growing varieties with different maturities as mixtures.

Glasshouse screening for resistance to S. nodorum in wheat (with R.E. Wilson)

During the year 16 sets of material were screened. Material comprised stage 1.2 and stage 2 lines as well as experimental Triticum tauschii material.

Tests were conducted on Triticum tauschii lines and synthetic hexaploid derivatives. Derivatives are called synthetic because their production imitates the natural cross of durum with the primitive grass species %. tauschii which in theory resulted in the first bread wheat.

Trial 90MT15 and 90E12

Time of planting and variety effects on septoria diseases of wheat. (with W. Smith, Esperance)

Location: Mt. Barker Research Station and Esperance Downs Research Station.

To establish earliest practical planting times for differing varieties to minimize the impact of Septoria diseases and maximize yield.

Trial 90BA15 (90ES20 was discontinued because of very severe Rhizoctonia and absence of leaf disease)

Location: Badgingarra Research Station.

To compare a range of new products for control of Septoria diseases with the current standard chemical - TILT.

Trial 90A4

Is seed infection a significant source of early inoculum of septoria nodorum?

Location: Avondale Research Station.

To evaluate the effect of seed borne infection of S. nodorum as early season inoculum.

Are ascospores a significant source of infection of septoria nodorum?

Location: Badgingarra and Mt Barker Research Station.

To determine the extent of ascospore dispersal of Leptosphaeria nodorwn from wheat stubble.

Unusual disease occurrence.

Leaf rust (Puccinia recondita) of wheat

Location: Esperance and Mt. Barker, Jerramungup

Leaf rust has occurred in Western Australia, perhaps for the first time in over 10 years. A late wheat leaf rust epidemic developed along the south coast between Esperance and Mt Barker.

It was first apparent at trace levels on early-sown crops in September around Esperance. Because rainfall was below average in many areas until October, the rust did not increase until late in the season. It reached yield-damaging levels in some later sown crops with severe epidemics observed in the Esperance and Jerramungup districts. The rust strain is new to Western Australia. Its mode of entry is unknown but is likely to have been by wind from South Australia and its appearance relatively early in 1990 suggests it reached Western Australia in 1989. It apparently remained undetected, surviving through a summer with favourable rains.

Number of Pages

53

Keywords

Western Australia

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