disease_location_field
field
Leaf spot of cucumber and melon (watermelon, musk melon, cantaloupe). Symptoms begin as yellow-brown flecks, 0,5 mm diam., on the upper surface of usually the crown leaves. They have a light green halo and gradually enlarge, becoming coalescent, with concentric ringing more commonly on the upper surface. Death of the leaves can be followed by lesions, several cm diam., forming on ripe fruit. These become covered with a dark, olive-green, conidial mass; they may be sunken and also show the concentric zonation. Infection of fruit in the field may be aggravated by exposure to sunlight (10: 431). Infection of stems or petioles does not occur. The pathogen can also cause decay in transit and storage, especially of melons and squash.
Macrosporium cucumerinum
Alternaria cucumerina