August 4, 2025

Pathogenicity, Aggressiveness, and Temperature Response of Paramicrosphaeropsis eriobotryae Associated with Almond Twig Dieback and Wood Necrosis

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Field surveys reveal Paramicrosphaeropsis eriobotryae causes vascular necrosis in almonds, showing significant temperature-dependent aggressiveness.

Paramicrosphaeropsis eriobotryae is identified as a novel and aggressive pathogen affecting almond trees.
Symptoms include vascular necrosis, wood discoloration, and dieback, confirmed through Koch's postulates.
PCA analysis shows geographic variation in aggressiveness, with southern isolates more aggressive than western ones.
Temperature significantly influences pathogenicity, with optimal growth occurring between 25-30°C, posing biosecurity challenges.

Negahban et al. (2025) studied this question.

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Field surveys reveal Paramicrosphaeropsis eriobotryae causes vascular necrosis in almonds, showing significant temperature-dependent aggressiveness.