Annals of Applied Biology (2000) 137, 213-221

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G.L. Bateman, S.G. Edwards, J. Marshall, L.W. Morgan, P. Nicholson, M. Nuttall, D.W. Parry, M. Scrancher and A.S. Turner (2000)
Effects of cultivar and fungicides on stem-base pathogens, determined by quantitative PCR, and on diseases and yield of wheat
Annals of Applied Biology 137 (3), 213-221
Abstract: The polymerase chain reaction (PCR) was used to identify and quantify all fungal pathogens of wheat (Triticum aestivum) stem bases in nine field experiments at three locations in England. The main aim was to apply quantitative PCR to provide robust data on the efficacy of new fungicides against the individual components of the stem-base disease complex. Cyprodinil most effectively controlled eyespot by decreasing both pathogens, Tapesia yallundae and T. acuformis (the most widespread species), and sometimes contributed to increased yields. Prochloraz controlled eyespot less consistently, its effectiveness dependent mainly on the presence of T. yallundae or on rainfall events soon after application. Azoxystrobin contributed to yield increases most consistently. Although it decreased sharp eyespot and its pathogen, Rhizoctonia cerealis, these effects were insufficient to account for much of the yield increases. The effects of fungicides on eyespot were sometimes greatest on the most susceptible cultivars. Amounts of Tapesia DNA were usually consistent with cultivar susceptibility ratings. The only pathogens of brown foot rot present in significant amounts were Microdochium nivale vars nivale and majus. They appeared not to affect yield or to respond greatly to fungicides. The susceptibility of cultivars to these pathogens was sometimes similar to their susceptibility to eyespot, suggesting that they may respond to the same host resistance genes or may in some cases be secondary colonisers of eyespot-infected plants.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Paul Nicholson, Simon G. Edwards

Research topic(s) for pests/diseases/weeds:
control - general
surveys/sampling/distribution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Oculimacula yallundae Wheat (Triticum) United Kingdom
Microdochium nivale Wheat (Triticum) United Kingdom
Ceratobasidium cereale Wheat (Triticum) United Kingdom
Oculimacula acuformis Wheat (Triticum) United Kingdom
Microdochium majus Wheat (Triticum) United Kingdom