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 S., 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|
|Number of Pages:||11|
|Page Range:||pp. 621-631|
|Access rights to Published version:||Restricted or Subscription Access|
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