Yield reduction in barley in relation to spot-type net blotch

Authors

Kithsiri Jayasena, Department of Agriculture and Food, Western AustraliaFollow
Andrew Van Burgel, Department of Agriculture and Food, WAFollow
Kazue Tanaka, Department of Agriculture and Food
John Majewski, Department of Agriculture and Food
Rob Loughman, Department of Agriculture and Food, Western AustraliaFollow

Document Type

Article

Publication Date

9-2007

Journal Title

Australasian Plant Pathology

ISSN

Print: 0815-3191 Electronic: 1448-6032

Keywords

leaf disease, Pyrenophora teres f. maculata

Disciplines

Agronomy and Crop Sciences | Biosecurity

Abstract

To study the loss of grain yield associated with specific levels of spot-type net blotch of barley, experiments were conducted at three sites with between four and six different levels of application of the fungicide propiconazole or mixtures of propiconazole and iprodione applied to obtain a wide range of disease levels. Yield loss varied from 23 to 44%. There was a negative linear relationship between yield and the average disease severity on the top three leaves (flag, flag-1 and flag-2). The observed relationship was much stronger at the milk stage compared with early flag leaf emergence stage. On average, every 10% increase in disease severity on the top three leaves accounted for 0.4 t/ha yield loss. The yield response to disease was independent of locations and years. The disease affected grain quality, with grain protein and screenings consistently higher and grain size consistently lower than samples from undiseased barley.

Recommended Citation

Jayasena, K, Van Burgel, A, Tanaka, K, Majewski, J, and Loughman, R. (2007), Yield reduction in barley in relation to spot-type net blotch. Australasian Plant Pathology, 36, 429-433.
https://library.dpird.wa.gov.au/bs_research/86