Mycosphaerella leaf spot

Disease

Mycosphaerella leaf spot

Mycosphaerella pyri (Auersw.) Boerema

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


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.