448 
Journal of Agricultural Research 
Vol. VIII, No. ia 
cultures of Sclerotium Rolfsii established the identity of the peanut-wilt 
fungus as this organism. 
(7) Counts of wilted plants in 1915 showed that 15 per cent had one 
or more diseased shoots. Similar counts in 1916 showed a larger per¬ 
centage of wilted plants. No fruits are produced by shoots attacked 
early in the season, and shoots attacked later in the season generally 
fail to mature their fruits. Diseased shoots are dry and shrunken and 
of little or no value for hay. 
(8) Preliminary tests indicated that the careful selection of healthy 
seed did not reduce the amount of wilt; probably due to the fact that 
the soil was thoroughly infested with 5 . Rolfsii . 
(9) Data relative to the value of a 3-year rotation indicate that 
S. Rolfsii lives over in the soil for three years and produces as large a 
percentage of disease on land where a 3-year rotation was practiced as on 
land continuously planted to peanuts. 
(10) Tests of six varieties of peanuts and one hog goober, Worandzia 
subterranea , planted in soil badly infested with 5 . Rolfsii showed that the 
Valencia peanut is most susceptible to this organism and that Spanish, 
Tennessee Red, and Virginia Bunch are respectively resistant in the order 
named, while Virginia Runner, African, and Hog Goober are practically 
immune to 5 . Rolfsii . 
(11) Experiments indicate that soil infested with Sclerotium Rolfsii 
should be planted to resistant varieties of peanuts in preference to 
attempting to rid the soil of this parasite by rotation. 
(12) Observations during the seasons of 1915 and 1916 indicate that 
5 . Rolfsii does not attack crimson clover planted in September or October 
for a cover crop. 
