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Crop and Pasture Science Crop and Pasture Science Society
Plant sciences, sustainable farming systems and food quality
RESEARCH ARTICLE

Definition of infection period for field infection of scald in Victoria

JS Brown

Australian Journal of Agricultural Research 42(5) 811 - 817
Published: 1991

Abstract

Conditions suitable for infection of barley with Rhynchosporium secalis were determined by exposing seedlings to inoculum from scald-infected barley plants growing in the field. Maximum infection occurred when the duration of leaf surface wetness was c. 12 h and the average temperature during those periods was c. 6¦C. On this basis potential infection periods were defined as periods of leaf surface wetness of >12 h duration with an average temperature of >6¦C during the period. Meterological records indicated that during the 1983-89 growing seasons there was an average of 91 periods of leaf surface wetness per year at Walpeup and 104 at Horsham and that c. 20% were potential infection periods. The modal duration of leaf surface wetness category was >9-12 h at Horsham and >0-3 h at Walpeup and the modal average temperature category during periods of leaf surface wetness was >6-9¦C at both locations. None of the six most commonly occurring combinations of duration and temperature during periods of leaf surface wetness met the criteria for potential infection periods defined above.

https://doi.org/10.1071/AR9910811

© CSIRO 1991

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