Alternaria carolinaeana Unamuno, 1941

on Dahlia

Alternaria carolinaeana: colony, spores, on Dahlia pinnata

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).

mod 30.x.2017