Forecasting sclerotinia disease on lettuce: a predictive model for carpogenic germination of Sclerotinia sclerotiorum sclerotia
Clarkson, John P., Phelps, Kath, Whipps, John A., Young, Caroline, 1961-, Smith, Julie A. and Watling, Marlyn. (2007) Forecasting sclerotinia disease on lettuce: a predictive model for carpogenic germination of Sclerotinia sclerotiorum sclerotia. Phytopathology, Vol.97 (No.5). pp. 621-631. ISSN 0031-949XFull text not available from this repository.
Official URL: http://dx.doi.org/10.1094/PHYTO-97-5-0621
A predictive model for production of apothecia by carpogenic germination of sclerotia is presented for Sclerotinia sclerotiorum. The model is based on the assumption that a conditioning phase must be completed before a subsequent germination phase can occur. Experiments involving transfer of sclerotia from one temperature regime to another allowed temperature-dependent rates to be derived for conditioning and germination for two S. sclerotiorum isolates. Although the response of each isolate to temperature was slightly different, sclerotia were fully conditioned after 2 to 6 days at 5 degrees C in soil but took up to 80 days at 15 degrees C. Subsequent germination took more than 200 days at 5 degrees C and 33 to 52 days at 20 degrees C. Upper temperature thresholds for conditioning and germination were 20 and 25 degrees C, respectively. A predictive model for production of apothecia derived from these data was successful in simulating the germination of multiple burials of sclerotia in the field when a soil water potential threshold of between -4.0 and -12.25 kilopascals (kPa) was imposed. The use of a germination model as part of a disease forecasting system for Sclerotinia disease in lettuce is discussed.
|Item Type:||Journal Article|
|Subjects:||S Agriculture > SB Plant culture|
|Divisions:||Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)|
|Journal or Publication Title:||Phytopathology|
|Publisher:||American Phytopathological Society|
|Official Date:||May 2007|
|Number of Pages:||11|
|Page Range:||pp. 621-631|
|Access rights to Published version:||Restricted or Subscription Access|
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