{"id":2644,"date":"2024-06-03T14:04:37","date_gmt":"2024-06-03T12:04:37","guid":{"rendered":"https:\/\/pinova-meteo.com\/proizvod\/apple-scab-venturia-inaequalis"},"modified":"2025-07-17T08:55:17","modified_gmt":"2025-07-17T06:55:17","slug":"apple-scab-venturia-inaequalis","status":"publish","type":"product","link":"https:\/\/pinova-meteo.com\/en\/product\/apple-scab-venturia-inaequalis","title":{"rendered":"Apple scab – Venturia inaequalis"},"content":{"rendered":"

Apple Scab on Leaves and Fruit<\/strong><\/h2>\n

Causal Agent:<\/strong> Venturia inaequalis<\/em><\/p>\n

Apple scab is the most widespread and economically significant disease of apples both globally and in our region. The disease leads to a reduction in both yield quantity and fruit quality. Given that apples represent the most intensively cultivated fruit species in Croatia, annual expenses for pest and disease control range between \u20ac1,000 and \u20ac1,500 per hectare<\/strong>, with apple scab alone accounting for approximately 50%<\/strong> of those costs. In fact, almost the entire plant protection program for apples is structured around managing this disease, with 15 to 20 fungicide treatments<\/strong> typically applied per season.<\/p>\n

\n

What Parts of the Tree Are Affected?<\/strong><\/h3>\n

Apple scab primarily affects leaves and fruit<\/strong>, although young shoots and flowers<\/strong> may also be attacked under certain conditions.<\/p>\n

\n

Symptoms<\/strong><\/h3>\n

On leaves<\/strong>, symptoms appear as dark olive to rusty-black circular spots with indistinct edges. These spots often merge, leading to leaf distortion and premature defoliation. On fruit<\/strong>, lesions develop into corky, cracked areas that significantly reduce market value.<\/p>\n

\n

Biology of the Fungus<\/strong><\/h3>\n

The pathogen Venturia inaequalis<\/em> overwinters in two primary ways<\/strong>:<\/p>\n

    \n
  1. \n

    As mycelium or conidia<\/strong> on the bark of heavily infected trees, often between bud scales or in crevices of young shoots.<\/p>\n