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Seasonal and geographical variation of powdery mildew on susceptible cereal cultivars, 1958‐68
Author(s) -
DOLING D. A.,
SAUNDERS P. J. W.,
DOODSON J. K.
Publication year - 1971
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1971.tb02903.x
Subject(s) - mildew , powdery mildew , biology , cultivar , biological dispersal , agronomy , spring (device) , poaceae , winter wheat , hordeum vulgare , horticulture , demography , population , mechanical engineering , sociology , engineering
SUMMARY Annual patterns of mildew on winter and spring barley, wheat and oats at NIAB trial sites for 1958‐68 are reported. High intensities of mildew were preceded by early infections, particularly at sites where both winter and spring crops were infected early. Relative earliness and severity of infections in all six crops of cereals were generally similar at any site. This pattern was repeated within denned mildew ‘regions’, i.e. north, east and west. Sprowston (Norfolk) was atypical of the eastern sites, showing patterns of mildew infection more characteristic of sites in the west, where mildew values were 50 % higher than elsewhere. Dates of first visible infection became later further eastwards and northwards, particularly in winter cereals. This suggested the possibility of dispersal of inoculum by prevailing winds to the north, north‐east and east, or a similar progression in climatic factors favourable to mildew development. Estimates of loss of potential yield in the trial plots of sites in each region and over the whole country were calculated for winter wheat, spring barley and spring oats using the formulae of Large and Doling, for which supplementary confirmation was provided.