Raspberry anthracnose

Taxonomy and Nature of the Pathogen
Elsinoe veneta is an ascomycete fungus within the order Myriangiales. It is recognized globally as the primary fungal phytopathogen responsible for raspberry anthracnose, a severe disease that affects various bramble crops in temperate climates.

Diseases and Host Crops
The pathogen specifically targets members of the Rubus genus, particularly raspberries and blackberries. The disease manifests as small, purplish spots on young canes, which eventually expand into sunken grayish lesions with purple margins. Leaves and fruits can also be severely affected, leading to deformation, drying, and overall poor quality of the yield.

Biology and Life Cycle
The fungus survives the dormant season as mycelium in infected canes or debris. When spring temperatures rise and moisture becomes available, the fungus produces conidia. These spores are disseminated primarily by splashing rain and wind, allowing the infection to spread rapidly from plant to plant throughout the growing season.

Environmental Conditions and Economic Impact
High humidity and rainfall are the critical factors for the rapid development of Elsinoe veneta. The economic impact is significant; it causes severe yield losses, reduces fruit size, and drastically weakens the overall health of the raspberry plantation, making the plants more susceptible to winter injury and reducing their productive lifespan.

Protection and Control Measures
Management of anthracnose requires an integrated approach to minimize the spread of the pathogen:

• Selection of disease-free, certified planting material.
• Pruning and removal of infected canes to reduce the inoculum level.
• Optimizing spacing and trellising to improve air circulation and canopy drying.
• Application of protective fungicides during early spring (bud break) and throughout the season if conditions are favorable for disease development.