Indiana Plant Diseases. 199 
' Burkholder reports brown rot, caused by Sclerotinia cinerea, from Knox, 
Gibson, Vanderburg, Daviess, Greene, Morgan, Henry, Montgomery, Floyd, 
Clark and Jefferson counties. He found brown ret worse in the orchards 
affected with the black spot disease and according to his observations the 
varieties Champion and Carman were most severely affected, Hale was 
less severely attacked, while the Elberta variety was affected the least. 
Except in Vanderburg county where brown rot was the worst. Burkholder 
found that spraying controlled the disease fairly well. Very little brown 
rot was found in the crop in the Decker region probably because of the care 
given to the orchards. 
Scab due to Cladosporium carpophilum was unusually prevalent in the 
Decker region and was generally present on fruit in local markets. 
Die-back attributed to Valsa leucostoma was found by Burkholder in 
neglected sod orchards in Brown, Bartholomew, Greene, Orange and Daviess 
counties. 
In the Decker region the hail storm of June 23 caused severe damage 
to fruit and limbs. Splitting and breaking down of the heavily loaded trees 
in one orchard at Decker were attributed to 1918-19 winter injury and 
Burkholder reports 1919-20 winter injury in Spencer County. 
PEAR, 
Fire blight continued its attack rather late into the season and was gen- 
erally present throughout the state. Leaf infection was noticed at 
Knightstown July 6. 
Sooty blotch was noted at Knightstown September 21. Black rot caused 
by Physalospora cydoniae was rather prevalent in the crop about Moores- 
ville. 
PLUM. 
Brown rot was unusually destructive this year. Plum pockets was re- 
ported from Delaware county. 
POTATO. 
Tipburn or hopperburn was not as severe as in 1919 although it caused 
a heavy loss in the late crop. It seemed to be worse in the central part of 
the state. Bordeaux sprays seemed to control this trouble at Lafayette. 
Fusarium wilt was the most serious disease in the northern half of the 
state and caused considerable loss. F. C. Gaylord reports the disease from 
Porter, LaPorte, St. Joseph, Elkhart, Kosciusko, DeKalb, Tippecanoe, 
Hancock, Marion, Owen and Decatur counties. Gregory found wilt also 
in Lagrange and Floyd counties. Undoubtedly much of this trouble was due 
to the use of infected seed. A field test near Valparaiso showed a marked 
reduction in yield due to the use of infected seed stock. That soil infesta- 
tion is responsible for much of the wilt is indicated by the occurrence of the 
disease in about equal percentages in test plots planted with seed from 
widely separated sources and by the abundance of the disease in a field 
planted with seed carefully selected for freedom from wilt. 
