Abstract:
:ABSTRACT A simple model has been developed to predict the onset of pseudothecia maturity and seasonal ascospore showers in relation to blackleg disease in canola, caused by the fungus Leptosphaeria maculans. The model considers a combination of two weather factors, daily mean temperature and daily total rainfall, to drive progress of maturity of pseudothecia on the infested canola stubble left from past crops. Each day is categorized as suitable or not suitable for progress of the maturation process. The onset of pseudothecia maturity occurs when approximately 43 suitable days have occurred. Following the onset of maturity, ascospore showers are triggered when daily rainfall exceeds a threshold. The model satisfactorily predicted the timing of the onset of pseudothecia maturity when tested with 3 years of field observations at four locations in Western Australia, which characteristically has a Mediterranean climate. The model also agreed reasonably well with the daily pattern of ascospore release observed in two locations. Sensitivity analysis was performed to show the relative importance of the parameters that describe the onset of pseudothecia maturity.
journal_name
Phytopathologyjournal_title
Phytopathologyauthors
Salam MU,Khangura RK,Diggle AJ,Barbetti MJdoi
10.1094/PHYTO.2003.93.9.1073subject
Has Abstractpub_date
2003-09-01 00:00:00pages
1073-81issue
9eissn
0031-949Xissn
1943-7684journal_volume
93pub_type
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