Mycosphaerella lupini sp. nov., a serious leaf spot disease of perennial lupin in southcentral Idaho, USA

Abstract

Mycosphaerella lupini is described as the teleomorph of Thedgonia lupini, the organism commonly associated with a leaf spot disease of perennial lupin in the U.S.A. The latter organism is also shown to be distinct from Didymella lupini, which is associated with a Phoma anamorph, and occurs predominantly on overwintered lupin stems. Thedgonia lupini, which is known to produce conidia in disarticulating chains, is shown to do so by sympodial as well as percurrent proliferation. The genus Thedgonia is accordingly emended to incorporate both types of proliferation of the conidiogenous locus. Mycosphaerella lupini is the first teleomorph linked to the anamorph genus Thedgonia.

Key Words:

• Ramularia
• Thedgonia
• Lupinus
• systematics