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Abstract Detail



Host/Plant Pathogen Interactions and Plant Health Management

Annis, Seanna L. [1], Case, Tyler [1].

Factors affecting the germination of pseudosclerotia of Monilinia vaccinii-corymbosi.

Monilinia vaccinii-corymbosi (MVC) causes mummy berry disease in blueberries and is the most important fungal pathogen affecting lowbush blueberry (Vaccinium angustifolium) in Maine. MVC overwinters as pseudosclerotia and germinates in the spring to produce apothecia and ascospores that attack developing leaf and flower buds in blueberries. Identifying when apothecia are present in the field is crucial for determining the timing of fungicide applications to control this disease. Development of a model for the timing of germination of pseudosclerotia will aid in determining when to scout fields for apothecia. Pseudosclerotia require a maturation period in soil after they fall from the plant and a chill period before they will germinate. Lab and field experiments indicate that pseudosclerotia chilling requirements (time between 0 and 7 °C) significantly impact the percentage of pseudosclerotia that germinate apothecia. Pseudosclerotia that have been chilled for 800 hours only produced stalks and a minimum of 900 chill hours are required for the formation of apothecia. As chill hours increase, the number of apothecia that germinate from pseudosclerotia have been observed to increase up to 1600 chill hours. We are continuing to examine the effects of chill hours on development of pseudosclerotia.


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1 - University of Maine, School of Biology and Ecology, 5722 Deering Hall, Orono, ME, 04469-5722, USA

Keywords:
Vaccinium
Monilinia
Blueberry
apothecia
pseudosclerotia.

Presentation Type: Oral Paper:Papers for Topics
Session: 55
Location: Salon 2/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 4:30 PM
Number: 55006
Abstract ID:1280
Candidate for Awards:None


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