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A First Assessment of the Cranberry Fruit Rot Complex in Michigan
R O Olatinwo1, E J Hanson2, A M C Schilder1
1Department of Plant Pathology, Michigan State University, East Lansing 48824.
Plant Disease
|March 1, 2019
Summary
Michigan cranberry farms experienced significant fruit rot, with incidence varying by year, cultivar, and farm. Key fungal pathogens like Colletotrichum acutatum and Glomerella cingulata were identified, impacting fruit quality.
Area of Science:
- Plant Pathology
- Mycology
- Agricultural Science
Background:
- Fruit rot diseases pose a significant threat to cranberry production.
- Understanding the distribution and incidence of these diseases is crucial for effective management.
Purpose of the Study:
- To determine the distribution and incidence of fruit rot diseases in Michigan commercial cranberry farms.
- To identify the fungal pathogens associated with rotted cranberry fruit over a three-year period.
Main Methods:
- Samples of ripe fruit were collected from eight commercial cranberry farms in Michigan over three years (1999-2001).
- Fruit rot incidence was assessed across different beds and cultivars.
- Fungal pathogens were isolated and identified from rotted fruit samples.
Main Results:
- Fruit rot incidence varied widely, with mean incidence decreasing from 33.4% in 1999 to 12.8% in 2001.
- Cultivar susceptibility differed, with Ben Lear, Bergman, and Pilgrim generally showing lower incidence than Beckwith and WSU61.
- Colletotrichum acutatum, Pestalotia vaccinii, and Phyllosticta vaccinii were frequently isolated; Glomerella cingulata emerged in 2001 and predominated in rotted fruit.
Conclusions:
- Fungal pathogens, notably Colletotrichum acutatum and Glomerella cingulata, are key contributors to cranberry fruit rot in Michigan.
- Disease incidence and pathogen distribution show variability across years, cultivars, and geographic regions within the state.
- Further research into cultivar resistance and regional pathogen prevalence is warranted for improved cranberry crop protection.
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