235 



Observations during the season of 19'i;5 have established its occurrence 

 in 6 additional counties, distributed as shown on Map 90. 



No definite cause is known for it, but it appears to be serious 

 where seen and should receive prompt attention from growers. The only 

 control known is to dig out and burn diseased plants. 



Leaf Blight 



Caused by Ccrcospora bliti Tharp 



This bramble leaf blight, first described in Texas and said to be 

 serious there, was found in 1922 in Jackson county, Illinois. It is caused 

 by a fungus which makes large inroads upon leaf-tissue and may cause 

 serious defoliation. 



Powdery Mildew 



Caused by Sphacrotlicca liiiiiiuli (DC.) Burr. 



Powdery mildew is of rare occurrence in Illinois and causes no 

 damage. It has been found in Champaign, Ogle, and Marion counties 

 on blackberry ; and on raspberry in Ogle county. . On dewberry it has 

 been found in Champaign county ; and on the native wild blackberry, in 

 Marion county. 



Gooseberry and Currant 



These two fruits are not grown to any great extent commercially in 

 Illinois, but they are extremely common in the home gardens. As with 

 the brambles, their diseases are so largely the same for both that they 

 are discussed together. 



Anthkacnose 



Caused by Pscitdopcsi::a ribls Kleb. 



Anthracnose is the most important disease of gooseberry and cur- 

 rant and occurs conmionly on both. On leaves it has the form of dark 

 or reddish brown, very small spots, scattered over the upper surface in 

 greater or less numbers. These spots enlarge only slightly, and as they 

 grow old develop a single black dot in their center. Seriously infected 

 leaves become mottled, or turn yellow and fall early in the season. 



Damage done by this disease results from the injurious effects of 

 premature defoliation, from spotting of the fruit, which sometimes oc- 

 curs, and from poor development of fruit, due to infection of the fruit 

 stems. 



The present known occurrence of the disease in Illinois is shown 

 on Map 91. It has been found in 21 counties, widely distributed over 

 the state. 



Control is secured, when necessary, by the use of lime sulfur (1-50), 

 making the first application as soon as the leaves ajipear, and following 

 with additional treatments every fortnight until about (he first of .Xugust. 



