Alternaria carolinaeana Unamuno, 1941
on Dahlia

Dahlia pinnata, from Unamuno (1941a): leaf spot (A), colony (B), and, at higher magnification, six conidia (C)
gall
leaf spots 2-6 x 3-10 mmm, bumoerous, epiphyllous, mainly near the veins dark brown at first, ultimately becoming pale. Conidiophores cylindrical, ± straigh, 2-3 septate; conidia 11-22 x 43-150 µm.
hostplants
Asteraceae, monophagous
Dahlia pinnata.
references
Brandenburger (1985: 624), Unamuno (1941a).
Last modified 30.x.2017