Colletotrichum acutatum on ornamental lupin in United Kingdom
Anthacnose of ornamental lupin (Lupinus polyphyllus and its hybrids) due to Colletotrichum acutatum (EU Annex II/A2) was observed for the first time in autumn 1989, in three nurseries in East Anglia, United Kingdom. The disease was observed on seedling, pot-grown plants under protection and field-grown plants. In 1989, only a few crops were affected but the disease was widespread on container-grown lupins, mainly grown under protection in Cambridgeshire, Devon, Hampshire, Yorkshire and Lancashire. Losses on ornamental lupin had also been reported in France, New Zealand and USA. Studies were carried out on seed transmission of C. acutatum and on its host range. Seedborne infection was demonstrated on lupin. In pathogenicity tests (using isolates from lupin seeds), symptoms of C. acutatum developed only on plants of Lupinus spp. Slight symptoms were observed on Pisum sativum, Vicia sativa and Lathyrus odoratus, but none on Vicia faba, Phaseolus coccineus, P. vulgaris and Onobrychis viciifolia. Further studies are needed to determine whether isolates from Lupinus spp. can infect other hosts of C. acutatum, notably anemone and strawberry.
Sources
Reed, P.J.; Dickens, J.S.W.; O'Neill, T.M. (1996) Occurrence of anthracnose (Colletotrichum acutatum) on ornamental lupin in the United Kingdom.
Plant Pathology, 45(2), 245-248.