- 13 - 
it may not be in the i.iland now. On the o+h^r hand, when 
one remembers how difficult it is to absolutely eradicate 
a soil parasite like the one in question, it seems quite 
possible that it may still be in Malta " Map lists 
Canada, Newfoundland, U.S.A., Peru, Faroe Islands, Portugal, 
So. Africa, Malta, and Japan. The map is small and not 
very clear but has dots indicating infections in the British 
Isles, France, Switzerland, Germany, Czechoslovakia, Austria, 
Hungary, Poland, Norway, Sweden, Finland, Holland, Belgium, 
and perhaps others. Pethybridge, G. H. Fungus and other 
diseases of crops 1928-1932- Ministry of Agric. and Fisher- 
ies, Bui. No. 79, 1934 is only Pethybridge article in litera- 
ture cited, but quotation cites Pethybridge (1935 in litt.) 
(17) Lindfors, T. 
1935 Potatiskraftan i Sverige: des utbredning och bekampande 
intill ar 1935. (Potato wart in Sweden; its distribution 
and control up to the year 1935) - Medd. Vaxtskyddsanst . 
Stockh. 11, 1935. (Abstr. R.A.M. 14: 787-8. Dec. 1S35.) 
Wart distribution in Sweden since discovered in 1912 
followed by apparently complete disappearance until 1928, 
360 infection centres covering 4,329 hectares. Spread largely 
by seed potatoes also by manure, domestic animals (esp. 
poultry), agricultural implements, and running water, Crows 
and other birds may be involved in spread. Hosts, by in- 
oculations, include S olanum n igrum , S. d ulcam ara, and H yos - 
cyamus niger . Wart spores said to have rema: „ed viable 13 
years in Finland and 10 years in Denmark. 
(18) Neumann, H. 
1931 Ein Versuchsfeld zur Bekampfung des Kartoffelkrebses. 
(An experimental field for the control of potato wart.) 
Oestrr. Zeitschr, fur Kartoffelban, 1931, Sonde rnummber, 
pp. 115-116. (Abstr. in R.A.M. 11: 321-2. 1932) 
Field of 1,000 sq. m. in Austria planted in 1931 to the 
susceptible var. Alma, harvested Sept. 11. Of 3,000 plants 
only 35 were free from infection and these appeared to be a 
different variety. About 200 kg. of potatoes harvested, 
i.e., approximately the quantity used for seed. Plot believed 
uniformly infected and well adapted for soil disinfection 
trials. 
(19) Pissareff, V. E. and Vesselovsky, I. A. 
1929 Translation of Russian title - Potato selection in the 
Leningrad region, - Ann. State Inst, of Exper. Agron. Lenin- 
grad, 7: 290-300. 1929. (Abstr. R.A.M. 9: 401, 1930.) 
Among the medium-early and medium-late varieties, Great 
Scot was very resistant to virus diseases, late blight, and 
wart disease ( Synchytrium endobioticum ) , but is not a heavy 
