228 



Leaf blight of cherry is known to occur in 84 counties. Its distri- 

 bution, as shown on Map ?T, indicates a wide-spread and common occur- 

 rence in all parts of the state. 



It was estimated to have causeed a 1 to 2 per cent crop-loss during 

 the seasons of 1922 and 1923. 



Its control is relatively easy, by the use of either lime-sulfur or 

 Bordeaux mixture just after the petals fall and again about two weeks 

 later. If lime-sulfur is used lead arsenate and iron-sulfate should be 

 added. 



The black cherry, Prunus scrotina Ehrh., which has been commonly 

 domesticated, is subject to a leaf blight very similar in appearance to 

 the preceding and caused by a similar fungus (Coccomyccs liitescens 

 Higg.). Its known distribution in Illinois on black cherry is shown 

 on Map 78. 



Bacteri.\l Shot-hole 



Caused by Pscudonionas pruiii E. F. S. 



This disease is similar to the disease of the same name on peach 

 and plum, and is caused by the same bacterium. It has been foimd on 

 cherries in Saline county, in the southern part of the state, and in Kiio.\ 



county in the northern part. 



Grape 



Grape-growing on a commercial scale is not general in Illinois but 

 it has been developed in more or less restricted areas. Xevertheless, 

 there are to be found in the neighborhood of every town of any size one 

 or more growers who cater to the local market, and it is unusual indeed 

 to find a farm which does not have one or more vines producing grapes 

 for home consumption. According to the 1920 census there were 

 l,(f42,527 grape-vines of bearing age in the state, yielding a crop of 

 10,339,018 pounds in 1919. In addition there were 180,172 vines not yet 

 of bearing age. The distribution of these vines in the state is shown on 

 Map 79. 



Concentration of grape-production on a commercial basis occurs 

 especially in territory adjacent to large cities ; near Cairo in the south. 

 St. Louis in the southwest, Springfield, Rloomington, and Peoria in cen- 

 tral Illinois, La Salle and Chicago farther north, and Rock Island and 

 Moline in the west. The region of greatest production in the state, is 

 not, however, so related. This is the region surrounding Xauvoo, in Han- 

 cock county, where nearly 25 per cent of the vines of the state are located 

 and where in 1919 more than 20 per cent of the entire crop of the state 

 was grown. 



Aside from the strictly commercial concentration of gra])e-growing 

 in certain regions, production is more or less general over the entire 

 state. There is no community in which the grape crop does not have 

 some importance, and its total value is undoubtedly great. 



