Indiana Plant Diseases. 201 
experimental field at Lafayette planted with Indiana-grown Rural New 
Yorker seed. Gregory reports a 37 per cent loss in yield in a field of Barly 
Ohio potatoes in Dekalb county due to mosaie and a 100 per cent infesta- 
tion of mosaic in a field of the Bliss Triumph variety in Floyd county. 
The potato situation in the vicinity of Hammond presents a serious 
problem. In past years high yields were obtained but now 40 to 60 bushels 
per acre is representative. The plants are distinctly stunted, the leaves 
curled and wrinkled and the yield reduced to one or two small tubers. 
Imported seed, especially from the Wanatah region, is considered far more 
desirable than home grown seed. Typical mosaic symptoms are not 
present but it is suspected that the trouble is due to this disease. 
Considerable difficulty was experienced this year as a result of rotting 
of the seed pieces in the soil before the sprouts were up. This caused the 
oceurrence of many blank spaces in the fields. 
QUINCE. 
Fire blight caused by Bacillus amylovorus was reported from several 
localities. 
RADISH, 
Black-root was noted in cold frames near Indianapolis June 4. Downy 
mildew (Peronospora parasitica) and white rust (Cystopus candidus) 
were found on plants going to seed July 17. Marked hypertrophy of the 
floral parts was caused and lesions caused by both fungi were present on 
the seed pods. 
RASPBERRY, 
Anthracnose caused by Plectodiscella veneta is undoubtedly the limiting 
factor in raspberry culture in many sections of the state and was especially 
severe this year. Burkholder reports the disease present in the following 
counties: Lake, Laporte, Lagrange, Steuben, Cass, Miami, Wabash, Foun- 
tain, Bartholomew, Greene, Knox, Vanderburg, Warrick, Lawrence, Orange, 
Washington, Floyd and Jefferson. Specimens were received from Whitley 
and Madison counties and it was also found in Morgan and Marshall coun- 
ties. The coalescence of old lesions of the previous year about the bases of 
the bearing canes produces a girdling effect which causes the leaves to be 
stunted and yellowish and the fruit to ripen prematurely. Affected canes 
often die before any fruit is matured. Anthracnose lesions were noted 
on newly planted scions and the disease is undoubtedly introduced into 
new plantings with diseased cuttings. 
Leaf-spot due to Septoria rubi was found in Lake county. 
RHUBARB. 
Leaf-spot due to Ascochyta rhei was present in practically all plantings 
examined. 
