The effect of rainfall and temperature on the incidence of seed-borne Microdochium nivale in winter wheat in Scotland 1991-2000

TitleThe effect of rainfall and temperature on the incidence of seed-borne Microdochium nivale in winter wheat in Scotland 1991-2000
Publication TypeConference Paper
Year of Publication2002
AuthorsCockerell, V., M. A. Jacks, and A. M. I. Roberts
Conference NameProceedings Crop Protection in Northern Britain 2002
Pagination133-138
Conference LocationDundee
Abstract

An analysis of disease test results from winter wheat seed samples
submitted to the Official Seed Testing Station for Scotland between 1991 and 2000 showed that the incidence of seed-borne M. nivale fluctuated from year to year with average infection ranging from 3% in 1995 to 42% in 1997. In eight of the ten years examined average infection was higher than the 5% advisory threshold. In the two years when the average infection level was below 5% there were samples that exceeded this threshold. There appears to be no real regional differences in incidence of M. nivale seed infection in the main wheat growing areas of Scotland. The correlation between mean infection with M. nivale and total rainfall during the period 15 May – 30 June was 0.74 (p=0.015). The mean level of infection generally increased with increasing rainfall. However, the year
2000 was inconsistent with the general relationship, having low infection levels in a year with high rainfall. There did not appear to be a relationship between mean M. nivale levels and mean temperature for the same period 15 May – 30 June.

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