Mycosphaerella leaf spot

Disease

Mycosphaerella leaf spot

Mycosphaerella pyri (Auersw.) Boerema

Distribution: Widespread, although of minor economic importance in sprayed commercial orchards.

Photos

Small, black pycnidia develop in the interior of older lesions.

Small, black pycnidia develop in the interior of older lesions. Turner Sutton, NC State Univ.
A

Lesions are primarily circular, 3–5 mm in diameter, and have a grayish white interior, with a distinct purple margin; small, black pycnidia develop in the interior of older lesions (A). The fungus occasionally attacks the fruit, producing small, dark lesions.

  • Crops Affected: pears

    Management

    Fungicide programs targeting Fabraea leaf spot will effectively control Mycosphaerella leaf spot.

    Similar Species

    The disease can be confused with Fabraea leaf spot; Fabraea lesions tend to be darker.

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