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Management Guide
| Disease Cycle | Disease Management |
|---|---|
| Ripe rot is a fungal disease caused by Colletotrichum spp. This pathogen can overwinter in grapevine buds and stem tissues, as well as on weeds and trees surrounding vineyards. During the spring and summer months spores are released and dispersed by rain splash. Under warm and wet conditions, spores can infect. The phenological stage is also critical and increases throughout the season. Grapes become moderately susceptible after berry touch/bunch closure and highly susceptible from veraison to harvest. | Disease control measures should be targeted around the susceptible phenological stages of the grape cluster. Canopy management aimed at thinning the canopy can reduce stagnant air and moisture, reducing the risk for infection. Infection risk above 0.45 according to the model is considered very high. In replicated trials, fungicides timed during high risk days was able to effectively control ripe rot. |