Alternaria helianthinficiens Simmons, Walcz & Roberts, 1986

on Helianthus

parasite

Brownish black leaf spots with caespituli. Conidiophores brown, septate 5-7 x 20-100 µm. Conidia solitary brown, with long beaks, 12-18 x 60-300 µm, with 1-2 longitudinal septa.

host plants

Asteraceae, monophagous

Helianthus annuus.

references

Ondřej (1996a).