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Forecasting sclerotinia disease on lettuce: a predictive model for carpogenic germination of Sclerotinia sclerotiorum sclerotia
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Clarkson, John P., Phelps, Kath, Whipps, John A., Young, Caroline, 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. doi:10.1094/PHYTO-97-5-0621 ISSN 0031-949X.
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Official URL: http://dx.doi.org/10.1094/PHYTO-97-5-0621
Abstract
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, Engineering and Medicine > Science > Life Sciences (2010- ) > Warwick HRI (2004-2010) | ||||
| Journal or Publication Title: | Phytopathology | ||||
| Publisher: | American Phytopathological Society | ||||
| ISSN: | 0031-949X | ||||
| Official Date: | May 2007 | ||||
| Dates: |
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| Volume: | Vol.97 | ||||
| Number: | No.5 | ||||
| Number of Pages: | 11 | ||||
| Page Range: | pp. 621-631 | ||||
| DOI: | 10.1094/PHYTO-97-5-0621 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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