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Relationship Between Cluster Compactness and Bunch Rot in Vignoles Grapes
Bryan Hed1, Henry K Ngugi2, James W Travis2
1Department of Plant Pathology, Penn State University, Lake Erie Regional Grape Research and Extension Center, North East, PA 16428.
Plant Disease
|February 14, 2019
Summary
Compact grape clusters with more berries per centimeter are more susceptible to bunch rot. Reducing cluster tightness through practices like basal leaf removal can significantly decrease disease incidence in Vignoles grapes.
Area of Science:
- Viticulture and Plant Pathology
- Horticultural Science
- Agricultural Entomology
Background:
- Grape bunch rot poses a significant threat to Vitis cultivation.
- Cluster compactness and floral debris retention are suspected factors influencing disease severity.
- Effective disease management strategies are crucial for Vitis interspecific hybrid production.
Purpose of the Study:
- To investigate the relationship between cluster compactness and bunch rot incidence in 'Vignoles' grapes.
- To assess the role of debris retention in exacerbating bunch rot.
- To evaluate the efficacy of cultural practices in mitigating bunch rot.
Main Methods:
- Cluster compactness was assessed subjectively (OIV code 204) and objectively (berries per centimeter of rachis).
- Statistical analyses (Kolmogorov-Smirnov, Mann-Whitney U, logistic and linear regression) were used to correlate compactness with disease incidence and severity.
- The impact of basal leaf removal on cluster tightness and disease severity was evaluated.
Main Results:
- Compact clusters (higher berries per centimeter) exhibited significantly higher bunch rot incidence and severity.
- Each additional berry per centimeter nearly doubled the likelihood of infection (OR = 1.828).
- Berries per centimeter explained over 89% of the variation in bunch rot severity.
- Debris accumulation worsened rot, especially in compact clusters.
- Basal leaf removal reduced cluster tightness and bunch rot severity by 60-82%.
Conclusions:
- Berries per centimeter is a reliable indicator of cluster compactness in 'Vignoles'.
- Reducing cluster compactness is a viable strategy for integrated bunch rot management.
- Cultural practices targeting cluster density can effectively control bunch rot in susceptible cultivars.
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