34 Nebraska Agricultural Exp. Station, Research Bui. 10 
much heavier than on the check trees, and the number of apples 
which dropped prematurely much less. This was also noted by- 
Emerson (1905). 2. The leaves are also attacked. In unsprayed 
orchards, the foliage is sometimes so severely injured that the fruit 
never attains salable size, and scarcely any growth is made by the 
trees. It often takes two or three years of thoro spraying to bring 
the trees back to normal growth and productiveness. 3. Scab also 
impairs the keeping qualities of fruit. At harvest time in 1915 
several boxes of Winesap, Arkansas, and Ben Davis apples were 
sorted for exhibition, and for use in fruit judging. A part of each 
variety came from trees having considerable scabby fruit and a 
part from trees having no scab. All the fruit was free from visi- 
ble scab when packed. Some of the fruit was placed in cold storage 
and some in cellar storage. When the fruit was examined in Jan- 
uary, 1916, 10 per cent of the fruit in cold storage was scabby and 
68 per cent of the fruit in cellar storage was scabby. The fruit 
in cold storage was held a few days before being stored and was 
taken out 2 days before being examined. 
Development of scab in storage was also reported from various 
growers in the State. Several of these reports were followed up, 
and the fruit was examined and found to have a high percentage 
of scab. In each case the growers stated that all scab was 
culled out at packing time. Scab in storage was also noted by 
Brooks (1908), Morse (1910), Morse and Lewis (1911), Wallace 
(1913), and Morris (1914). 
There is no longer any doubt that the entrance of several 
serious soft rot fungi is facilitated by scab. Craig and Van Hook 
(1902), Eustace (1902). 
Because of the continued loss by the growers, due to scab, 
notwithstanding the more or less thoro spraying, further investi- 
gation was decided upon to determine to what causes or condi- 
tions the lack of control was due. 
The general appearance of this disease is so well known that 
space will not be taken to discuss it here. 
(1905) Emerson, R. A. Apple Scab and Cedar Rust, Nebraska Exp. Sta. Bui. 88:3. 
(1908) Brooks, Chas. Notes on Apple Diseases. New Hampshire Agr. Exp. Sta. Rpt. 
19-20:372. 
(1910) Morse, W. J. Notes on Plant Diseases 1908. Maine Agr. Exp. Sta. Bui. 164:4. 
(1911) Morse, W. J. and Lewis, C. E. Maine Apple Diseases. Maine Agr. Exp. Sta. 
Bui. 185:352-355, 390. 
(1913) Wallace, Errett. Scab Disease of Apples. Cornell Univ. Agr. Exp. Sta. Bui. 335: 
574-576. 
(1914) Morris, H. E. A Contribution to Our Knowledge of Apple Scab. Montana Agr. 
Exp. Sta. Bui. 96:75. 
(1902) Craig, John and Van Hook, J. M. Pink rot, an attendant of apple scab. New 
York, Cornell Sta. Bui. 207. 
(1902) Eustace, H. J. A destructive apple rot following scab. New York (Geneva) Sta. 
Bui. 227. Hypcoknus sp. another apple rot following scab. New York (Geneva) Sta. Bui. 255. 
