217 



It is known to occur, as sliown on Map 58, in seven counties, four of 

 which lie within the northern third of the state. Its occurrence in Ran- 

 dolph and Jackson counties, in the southwest, brings it within the inten- 

 sive pear-producing region and indicates the possibility of severe loss 

 under certain conditions. 



Le.af Spot 

 Caused by Mycosphacrclla scutiiia (Fr.) Schroet. 



Leaf spot is a disease which is often- confused with the leaf blight 

 previously described. It is distinguishable, however, by its more angular 

 spots, which are usually brownish, with, at later periods, grayish centers 

 bearing several small black dots. It does not occur on the fruit or twigs. 

 Leaf-spot attack results in the early falling of leaves; hence it is of im- 

 portance in nurseries, where serious infections may materially interfere 

 with the proper development of young trees. 



The first report of this disease in Illinois was made by Burrill in 

 1912, when he recorded its occurrence in Union county. Its distribution 

 as known at present is shown on Map 5!), but it probably has a much 

 wider occurrence than the map shows. 



Control, when necessary, is gained by the use of the usual sprays. 



Quince 



This fruit is not grown commercially to any great extent in Illinois. 

 For the most i)art single trees, or a few trees at the most, are maintained 

 to supply the home table. 



ihe diseases of the quince important in Illinois are few, and prob- 

 ably result in greater losses than would be the case were trees maintained 

 in well-cared- for commercial plantings. The following are known to 

 occur in Illinois. 



Leaf Blight 



Caused by Fabraca maciilata (Lev.) Atk. 



This disease is the same as the leaf blight of pear, but its effect on 

 quince is much more marked and constitutes the chief cause of loss from 

 disease. In appearance it is similar to pear leaf-blight, but it is much 

 more commonly found on the fruit of quince, where severe infections 

 cause marked distortion. On twigs the spots are elongated, and they 

 frequently cause the death of the twigs by girdling. 



Leaf blight is known to occur in Illinois in eleven counties, nine of 

 which lie in the southern tip of the state, as shown on Map 60. The twc 

 central counties, indicate a possible northward extension of the disease 

 under favorable conditions. 



Control is had by the application of lime-sulfur spray, as for pears. 



