Fiisariii))! in Tuber Rot and JJlIt of Potato 
17 
(Jn March 15 the following notes were taken. Series A: plant 1. 
slight curling of leaves : 2. apparently sound ; 3. curling of leaves ; 
4. curling of leaves. Series B: plant 1. drooping leaves; 2. lower 
leaves drooping, upper leaves drying: 3, apparently sound; 4, 
apparently sound. Series C: plant 1, apparently sound; 2, some 
wilting: 3. some wilting: 4. some wilting. Series D: plants 1, 2, 
and 3. apparently sound: 4. wilting. By ^larch 21 the plants 
.A , , B 
Fig. 3. — Wilt produced in laboratory with Fiisanum oxysponim, and con- 
trol plant: A. control. Early Ohio variety; B. wilting of lower leaves and 
curling of upper leaves. 4 days after inoculation. Early Ohio variety. 
infected with F. oxysponim showed a pronounced folding upward 
of leaves on the midrib, wilting and rolling on the margins of the 
leaves, the folding being most pronounced in the tips of the plants. 
The plants affected least showed discoloration on the margins, 
which at times was of a yellowish tint, at times purplish to violet. 
The leaves of plants most severely aft"ected showed a yellowing and 
burning of the leaf margins. One plant, inoculated with F. oxyspo- 
nim, developed a pronounced rosette, but overcame this later, grow- 
ing into quite a normal plant (figs. 4 and 5). These symptoms 
remind one forcibly of certain symptoms of the leaf-roll disease 
which has received so much attention, and which has been made the 
