Conidial morphology and the specialization of Bremia lactucae Regel (Peronosporaceae) on hosts in the family Compositae
1985
SKIDMORE, D.I. | INGRAM, D.S.
SKIDMORE, D. I. & INGRAM, D. S., 1985. Conidial morphology and the specialization of Bremia lactucae Regel (Peronosporaceae) on hosts in the family Compositae. Conidia of Bremia lactucae were collected from Lactuca saliva, Sonchus oleraceus, S. asper, Senecio vulgaris, S. bicolor subsp. cineraria, Cirsium arvense, Centaurea nigra and Picris hieracioides, from a wide distribution in the British Isles. There were no consistent differences between isolates taken from the different hosts in the lengths, breadths or length: breadth ratios of the conidia, the lengths of the conidiophores or the numbers of sterigmata per conidiophorc branch. Therefore, as there are no significant morphological differences between the isolates of Bremia lactucae from these hosts, the pathogen is classified upon host specialization. A review is presented of cross-infection studies in which isolates of B. lactucae had been inoculated on to a range of species of Compositae. On the basis of these investigations it is recommended that the term ‘formae speciales' is used to denote host specialization of isolates within the species Bremia lactucae.
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