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A New Rot of Potato Tubers——A new disease of potatoes, which 
was notified from Ireland last year, has now been described in detail 
Dr. G. H. Pethybridge.* It was first observed in 1909 in the 
plots of the temporary experiment station, established by the Irish 
Department of Agriculture, at Clifden, Co. Galway. Since then it 
has been kept under observation, and has also been received from 
other parts of Ireland. The rotting is found to be due to a fungus 
closely allied to Phytophthora infestans, but differing in certain 
essential particulars. The fungus is named P. erythroseptica, and 
ink Rot commences when the potatoes are still in the ground, 
and has been found in some varieties as early as July. In most 
intern 
Examined with the microscope diseased tissues show an abundance 
of rather wide, much branched, intercellular hyphae. No haustoria . 
were observed, and no reproductive organs of any sort could be 
discover 
1 y P. infestans, A account of the culture media and 
methods is given, and also of the experiments which prove the patho- 
genic character of the fungus. productive organs were produced 
* On the Rotting of Potato Tubers by a New Species of Phytophthora 
having a Method ofS Sexual Reproduction hitherto undescribed. Sci. Peak Roy. 
Dubl. Soe., vol. xiii, no. 35, March, 1913. 
