Em. Davison et Ag. Mckay, PYTHIUM SPP. ASSOCIATED WITH CAVITY SPOT OF CARROTS IN WESTERN-AUSTRALIA, Australasian plant pathology, 27(3), 1998, pp. 163-168
Cavity spot lesions on mature carrots from growers' properties, and ma
ture and maturing carrots from a disease nursery, were sampled for Pyt
hium spp. Over 98% of the isolates were P. sulcatum; other species iso
lated were P. irregulare and Pythium 'D'. P. coloratum was not found.
In vitro pathogenicity tests on carrots showed that isolates of P. sul
catum caused lesions while P. irregulare and Pythium 'D' did not. We c
onclude that P. sulcatum is the most common and most important species
associated with cavity spot of carrots in Western Australia.