4 MAINE AGRICUIvTURAL EXPERIMENT STATION. 1909. 



of these including Spaeropsis malorwn, have been found to pro- 

 duce decay of the fruit. 



On account of the general lack of spraying, apple scab, caused 

 by Venturia inaequalis (Cke.) Alderh., probably does more to 

 reduce the profits from Maine orcharding than any other dis- 

 ease. During the winter of 1907-08 hundreds of barrels of 

 Maine apples which were quite free from scab when placed in 

 storage were found to be in the condition represented by Fig. 

 I when taken out after six or eight weeks — quite thoroughly 

 covered with small black specks, usually smaller than those 

 shown in the photograph. This condition was new to the writer 

 and none of the orchardists consulted had experienced a like 

 trouble before.* Microscopic examination and cultures from 

 the diseased spots invariably showed the apple scab fungus and 

 nothing else. This abnormal development of scab was doubtless 

 due to several factors, the principal one being that the entire 

 growing and harvesting season was very wet, and the vegetative 

 development of the fungus continued up to and during the har- 

 vest time. The moist apples, covered with spores, were then 

 placed in rather warm cellars, resulting in the infection of the 

 fruit and the formation of the small scab spots in storage. 



In view of all that has been written and published on the com- 

 mon diseases of the apple, here mentioned, it hardly seems nec- 

 essary to remind Maine orchardists that much of the loss result- 

 ing from fungi is unnecessary and can be avoided by proper and 

 comparatively inexpensive treatment. To any who request the 

 Station will send a circular on How to Fight Apple Enemies. 



The Deveeopment oe Scab Upon Limed Potato Soies. 



In Bulletin No. 149 attention was called to the fact that while 

 liming had proven very beneficial to the clover and grass crops 

 in Aroostook County that it should be applied with caution to 

 potato soils in short rotations on account of its liability to largely 

 increase the amount of potato scab.t The following is a brief 

 summary of an experiment therein reported. 



* Prof. F. C. Sears of the Mass. Agricultural College has lately told 

 the writer that this development of scab in storage is not uncommon on 

 stored apples in Nova Scotia. 



T Me. Agr. Exp. Sta., Bui. 149, p. 316 (1907). 



