Phytophthora lacustris
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Phytophthora lacustris Brasier, Cacciola, Nechw., T. Jung & Bakonyi 2013
This oomycete is widely distributed and has been reported to infect mainly forest and fruit trees. It has been also frequently isolated from water and from soil. The species name is derived from the latin word 'lacus' (= lake or pool). For example, it has been reported from tree nurseries that have experienced waterlogging.
P. lacustris has been described as a saprotroph and an opportunistic pathogen (Nechwatal et al., 2013). Symptoms on infected trees include chlorosis and defoliation, as well as root and crown rot. Infected seedlings might die. It has been further reported as causing fruit rot. In soil infestation tests, P. lacustris results in a loss of root dry weight by about 50% and stem inoculations cause small to moderately long bark lesions (Nechwatal et al., 2013).
Morphologically, P. lacustris is similar to Phytophthora gonapodyides. It is sexually sterile and oospores have not been observed. Sporangia are egg-shaped to pear-shaped with an average size of 45 x 30 µm (Nechwatal et al., 2013).
