Pear scab

Pear scab is a serious fungal disease caused by the pathogen Fusicladium pyrorum (often referred to as Venturia pyrina). This specific pathogen attacks pear trees, leading to significant economic losses in commercial orchards and private gardens. The fungus primarily thrives in temperate climates where pear trees are widely cultivated.

The disease affects leaves, fruits, and young shoots. Symptoms include olive-brown spots covered with a velvety fungal coating. As the infection progresses, leaves turn yellow and drop prematurely. On fruits, the scab causes dark, hardened lesions, often resulting in cracking, deformity, and reduced shelf life of the fruit.

The development of the disease is strictly dependent on climatic conditions, specifically high humidity and frequent rainfall. The pathogen overwinters on fallen leaves and infected twigs. During spring, spores are released and carried by wind and splashes to susceptible plant tissues, initiating the primary infection cycle.

Pear scab causes significant harm by reducing both the quantity and quality of the harvest. Severely infected trees struggle with photosynthesis due to premature defoliation, which stunts growth and reduces overall tree vigor. If left unmanaged, the repeated infection cycle can lead to the death of young shoots and total crop loss.

Effective control requires an integrated approach. Sanitation is crucial: all fallen leaves must be collected and removed, and dead or infected branches should be pruned and burned. Chemical control involves the application of fungicides at critical development stages, such as green tip, bloom, and petal fall, to prevent initial infection and limit secondary spread.

• Sanitary pruning of infected branches during the dormant season.
• Removing or burying fallen leaves to eliminate overwintering sources.
• Selecting scab-resistant or tolerant pear cultivars for new plantations.
• Applying fungicides following regional agricultural advisory protocols.