First report of Phoma spp. on white lupine in north ...

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Title First report of Phoma spp. on white lupine in north America
Author(s) T. C. Paulitz, Etienne Cote
Journal Plant Disease
Date 1991
Volume 75
Issue 8
Start page 862
Abstract Lupines (Lupinus albus) collected at Ile D'Orleans and Emil Lods Seed Farm of Macdonald College in southern Quebec showed reddish brown lesions on the lower stems. Lesions originated from petiole scars and contained concentric rings of brown-black pycnidia. Similar lesions were observed on mature pods. The fungus was identified as Phoma sp. on the basis of conidial and pycnidial morphology on potato-dextrose and V8 juice agars. Leaves and stems of white lupine plants were inoculated (by airbrush or wounding) in the greenhouse with a spore suspension of Phoma spp. Plants were incubated at 20 degrees C for 48 h at 100% RH. After 1 week, inoculated plants were defoliated and characteristic lesions formed on stems. Phoma sp. was reisolated from stem lesions and was also isolated from surface-disinfested, discoloured brown seed. Similar inoculations of lucerne (Medicago sativa cv. Vernal), pea (Pisum sativum cv. Laxton Progress), soyabean (Glycine max cv. Maple Arrow) and red clover (Trifolium pratense) produced no symptoms. On the basis of these studies, the fungus is probably Phoma lupini, reported on L. mutabilis in Peru and on native lupines in the western United States..

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