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Peronospora grisea . [Descriptions of Fungi and Bacteria].

1983; CAB International Publishing; Linguagem: Inglês

10.1079/dfb/20056400766

2514-5606

CAB International UK, S. M. Francis, A. M. Berrie,

Plant Pathogens and Fungal Diseases

Abstract A description is provided for Peronospora grisea . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Hebe cookiana, H. elliptica × pimeleiodes, H. hulkeana, H. loganeoides, H. obtusata, H. salicifolia, H. speciosa, H. stricta, H. stricta var. macroura . DISEASE: Downy mildew of Hebe (shrubby veronicas) causing large and conspicuous brown lesions on the leaves. The undersurface of these areas becomes covered in a fairly dense pale grey to brownish down. Young shoots may also become dry, withered and die thus checking the growth of the plant. Young plants in nurseries can be severely affected and while older plants are not killed the large brown lesions on the leaves are very disfiguring. The oospores have been found in the leaf tissue of herbarium material from New Zealand, but not yet in British material. GEOGRAPHICAL DISTRIBUTION: Australasia (New Zealand); Europe (Britain, France, Germany). TRANSMISSION: No reports. Oospores have been found in leaf material from New Zealand but not in British specimens. No great quantity of the latter however has been available for examination. Infection from other species of Veronica is a possibility and a list of the species of Veronica on which a downy mildew has been recorded are given below. Note, however, that Jafar (1962) found in his inoculation experiments that the pathogen was host specific to each single species of Hebe and to the two species of Veronica, V. arvensis and V. tournifolia that were included in the tests.