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Take‐all severity and yield in winter wheat: relationship established using a single plant assessment method
Author(s) -
POLLEY R. W.,
CLARKSON J. D. S.
Publication year - 1980
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1980.tb01193.x
Subject(s) - biology , crop , winter wheat , grain yield , agronomy , yield (engineering) , dry weight , horticulture , zoology , metallurgy , materials science
SUMMARY Random samples of 500–600 single plants were taken from four winter wheat crops in eastern England during 1977–79 to establish the relationship between grain yield and severity of take‐all ( Gaeuman‐ nomyces graminis (Sacc.) Arx & Olivier var. tritici J. Walker) on the roots at harvest. In each crop separate samples were taken from areas of stunted plants with much take‐all infection and from areas with apparently normal growth. The root system of each plant was assessed for take‐all severity using four infection categories: healthy, slight (less than 25 per cent of the root system infected), moderate (25–75 per cent) and severe (more than 75 per cent). The assessment figures were compared with ear number, grain number and grain dry weight, which were also recorded for each plant individually. Shght take‐all had no effect on yield. Moderate take‐all had no effect on the number of ears per plant but significantly reduced grain number per plant, 1000‐grain weight and grain dry weight per plant by 6–9, 10–6 and 15–6 per cent respectively. The reduction in grain dry weight per plant associated with severe take‐all was between 53.1 and 61.6 per cent. Estimates of minimum national loss caused by take‐all in winter wheat in the years 1977–79 were 0‐9, 2–6 and 2–8 per cent respectively.