125 
infected fields have been analysed as to seed pathogens, 
but at most 2 — 3 per cent, were found to be infected 
by F. viticola. In viewing the means of -controlling the 
disease this fact must be kept in mind. 
A proper rotation of crops would certainly be one 
of the principal ways of combating the disease were it 
not for the existence of resistant varieties. Already in 
1918 great differences were seen in the degree of attack 
among the different varieties of garden-peas. While tho- 
plants in some parcels were very badly infected, others 
close by were seen to be wholly untouched or only 
very slightly attacked. For further information on this 
point a forthcoming paper by Professor H. Nilsson-Ehle 
should be consulted. 
It need only be said here that the only successful 
method of control seems to lie along the line of these 
resistant varieties. The varieties showing complete or 
almost complete immunity in 1918 showed the same 
characteristic in 1919. It is evident that new and excel- 
lent varieties of garden-peas may be secured by future 
breeding that shall result in a combination of the Fu- 
sarimn - resistance with other desirable characteristics. 
Literature cited. 
1. Appel, O. und Wollenweber, H. W. : Grundlagen einer Mono- 
graphie der Gattung Fusarium (Link). Arb. Kais. Biol. Anst. 
f. Land- u. Forstw. 8: 1 — 207. 1918. 
2. Hall, C. van: Die Sankt-Johanniskrankheit der Erbsen verur- 
sacht von Fusarium vasinfectum Atk. Ber. Deutsch. Bot. Ges. 
21: 2—5. 1903. 
3. Schikorra, G.: Fusarium-Krankheiten der Leguminosen. Arb. 
Kais. Biol. Anst. f. Land- u. Forstw. 5: 157 — 183. 1907. 
4. Wollenweber, H. W. : Studies on the Fusarium problem. Phy- 
topathology 3: 24 — 50. 1913. 
