188 Proceedings of Indiana Academy of Science. 
DISEASES ARRANGED BY Hoss. 
APPLE. 
Blotch (Fig. 1) caused by Phyllosticta solitaria was severe on the sus- 
ceptible varieties throughout the southern half of the state and was noted 
at Peru by F. P. Cullinan, in DeKalb county by C. T. Gregory, and as far 
north as Delphi, Columbia City, Steuben county and Lake county by C. L. 
Burkholder. The Mann and Maiden Blush should be added to the list of 
‘ 
Vig. 1. Apple blotch. 
susceptible varieties in the 1919 report. At Mitchell. Prof. Greene noted 
abundant fruit infection June 10 and petiole lesions were noted at Moores- 
ville June 11. Unsprayed Northwestern Greenings at Knightstown showed 
as high as 91 per cent fruit infection and 39 per cent petiole infection and 
at Mooresville as high as 97 per cent fruit infection and 83 per cent petiole 
infection. Counts made by Burkholder in Clark county showed 97 per 
cent fruit infection on unsprayed Ben Davis trees. Good control was se- 
cured with Bordeaux sprays 2, 4 and 6 weeks after petal fall, while sulphur 
dust, Bordeaux dust and dormant sprays were ineffective. 
Seab (Fig. 2) caused by Venturia inaequalis was especially severe in the 
southern part of the state but rather light in the northeast quarter of the 
state where its ravages are usually the worst, according to reports by 
Burkholder and Cullinan. Burkholder reports very little scab on unsprayed 
check plots in Whitley county except upon Ben Davis and Fameuse. On 
the other hand, the same observer reports that scab was more severe in the 
region between Crawfordsville and the Ohio river than in the preceding 
three seasons. At Mooresyille, June 25, scab was noted to be abundant on 
