Physalospora vaccinii Endophyte, commensal, inquiline, or incidental pathogen?
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Physalospora vaccinii Endophyte, commensal, inquiline, or incidental pathogen? OUDEMANS, P.V., C. Constantelos, F.V. Caruso, and P.S. McManus 1 Rutgers University, Chatsworth, NJ, U.S.A., 2 Retired; 3 University of Wisconsin
description
Physalospora vaccinii Endophyte, commensal, inquiline, or incidental pathogen?. OUDEMANS, P.V., C. Constantelos, F.V. Caruso, and P.S. McManus 1 Rutgers University, Chatsworth, NJ, U.S.A., 2 Retired; 3 University of Wisconsin. Cranberry Fruit Rot. Physalospora vaccinii. - PowerPoint PPT Presentation
Transcript of Physalospora vaccinii Endophyte, commensal, inquiline, or incidental pathogen?
Physalospora vacciniiEndophyte, commensal, inquiline, or incidental pathogen?
OUDEMANS, P.V., C. Constantelos, F.V. Caruso, and P.S. McManus
1Rutgers University, Chatsworth, NJ, U.S.A., 2Retired; 3University of Wisconsin
Cranberry Fruit Rot
Physalospora vaccinii
Location of P. vaccinii on the Cranberry
Cranberry Infection
Inquilinism is the use of a second species as a platform or cavity for the living circumstance of the beneficiary species.
Spore Trapping
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Pattern of Spore Release in Relation to Bloom Stages
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Pattern of Spore Release in Relation to Bloom Stages
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Pattern of Spore Release in Relation to Bloom Stages
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5/4 5/24 6/13 7/3 7/23 8/12 9/1 9/21 10/11
2007sp
2008sp
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In-bloom 2007
In-bloom 2008
In-bloom 2009
Pattern of spore release in relation to bloom stages
Comparison Spore Release in Massachusetts and New Jersey 2009
Date (2011)
May Jun Jul Aug Sep Oct
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leaf
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date MA vs spores MA doy vs spores NJ
Incidental pathogen is an organism with the propensity to be a pathogen under certain climatic or growing conditions.
0.020.040.060.080.0
100.0120.0140.0160.0180.0200.0
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MA9MA12 W
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Location (Bed)
Appr
esso
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NJ DE MA WI
Occurrence of Physalospora In other States
AVG. # APP. PER LEAF
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Indar/Abound Mancozeb Control
AVG. # APP. PER LEAF
AVG. # APP. PER LEAF
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Indar/Abound Mancozeb Control
AVG. # APP. PER LEAF
Results taken in June (left) and October (right) 2009 showing the effect of fungicide treatments on appressorium counts from different treatments. There appears to be no effect of fungicide use for fruit rot on the appressoria infection rate
Effect of Fungicide Regimes on Appressorium Counts - NJ
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Leaf Infection
Treatment
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% fr
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A comparison of different treatment regimes on leaf infection
Appresoria per leaf (postharvest) Current season only
Fruit rot (at harvest)
AVG. # APP. PER LEAF
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DM CQ ST MQ
AVG. # APP. PER LEAF
AVG. # APP. PER LEAF
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DM CQ ST MQ
AVG. # APP. PER LEAF
Results taken in June and October 2009 showing the effect of variety on appressorium counts from Bog 3 NJ. There appears to be a small effect of variety on the appressoria infection rate
Effect of Cultivar on Appressorium Counts - NJ
UMASS
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Results taken in June (left) and November (right) 2009 showing the effect of variety on appressorium counts from State Bog, UMass. There appears to be no effect of variety on the appressoria infection rate. However, the November sample is more in line with the NJ data
Effect of Cultivar on Appressorium Counts - MA
Conclusions
• P. vaccinii exhibits a 2-yr life cycle.
• The fungus is widespread
• Leaf infection is essential for survival
• Fruit infection seems incidental
Conclusions (continued)
• Outbreaks should be predictable
• Fungicide timing targets fruit infection
• Fungicide resistance is unlikely
