Physalospora vaccinii Endophyte, commensal, inquiline, or incidental pathogen? OUDEMANS, P.V., C. Constantelos, F.V. Caruso, and P.S. McManus 1 Rutgers.

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Presentation transcript:

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

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

Pattern of Spore Release in Relation to Bloom Stages

Pattern of spore release in relation to bloom stages

Comparison Spore Release in Massachusetts and New Jersey 2009

Incidental pathogen is an organism with the propensity to be a pathogen under certain climatic or growing conditions.

NJDEMAWI Occurrence of Physalospora In other States

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

A comparison of different treatment regimes on leaf infection Appresoria per leaf (postharvest) Current season only Fruit rot (at harvest)

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

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