189 



In the examination of fields for this disease the variety of wheat 

 was recorded for 2A'^^ acres. As shown in Table 2\, there were no- 

 table differences in the amount of infection found on nine varieties. 

 Among the soft wheats Fulcaster, Fultz, and New Columbia ai)]x'ar to 

 have suffered most, while Red Cross and Red Wave both appear to have 

 shown some resistance. Of the hard winter wheats Turkey 10-110 

 showed the most disease, and Turkey Red and Black Hull were about 

 equal in resistance. 



No practical means of control for this disease is yet known, but the 

 difTerences among several varieties of wheat in susceptibilitv to attack 

 suggest the advisability of jjlanting the less susceptible varieties where 

 speckled leaf-blotch is prevalent. 



Glume Blotch 

 Caused by Scptoria iwdornm Berk. 



The glume blotch disease of wheat had not been definitely re]iorted 

 in Illinois previous to 1933. A single instance of infection was found 

 June 18 in a field near Waterloo, Monroe county. In this field more than 

 . 80 per cent of the plants were diseased, and on individual heads the in- 

 fection involved from 40 per cent to 100 per cent of the spikelcts. Un- 

 doubtedly this disease is of much more common occurrence than our 

 observations indicate. 



Antiiracnose 



Caused by Colletotrichiim ccrcalc Manns 



This disease has probably been present in Illinois for many years, 

 though there are no definite rej)orts of its presence i)revious to 1!)2;}. 

 During the 1033-season anthracnose infections appeared in serious 

 amounts in the regions shown on Map 10, and Black Hull, Fultz, Red 

 Wave, Turkey Red, and Turkey 10-110 were the varieties diseased. Red 

 Wave and Fultz showed most serious infections. 



As it appeared in 1923 this disease was a serious one, causing weak- 

 ening and falling of the straw, premature ripening, and lodging of the 

 grain in the field. Losses in seriously infested fields were great. 



Foot-rot 

 Caused by Hclminthosporium spp. 



Under this name are included a number of wheat troubles variously 

 known as "foot-rot," "root-rot," "roselle," etc. Attention was first 

 called to the serious nature of these diseases in Illinois in A[)ril, 11)19, 

 when they were mistaken in certain fields in Madison county for Aus- 

 tralian take-all. Later in the same year foot-rot was found in Sanga- 

 mon and Mason counties. In one instance a 50-acre field suffered an 



