154 



A seedling disease characterized by a yellow stripe extending the entire 

 length of the leaves was found rather commonly during the last half of 

 May. The cause of this disease is unknown. 



A slight infection of ergot was found on lU'd Wave wheat in Noble 

 County, July 10th., by R. V. Allison. Powdery mildew {Eri/siphe graminis) 

 was abundant in the latter part of May, probably owing to the prolonged 

 wet weather. Tlie bacterial disease, black chaff, was found in Morgan 

 County. 



The Septoria leaf-spot was very prevalent early in the season. Later 

 the Septoria on the glumes became widespread. Out of the 596 fields ex- 

 amined in the course of the federal cereal disease survey, these diseases 

 were found in 133. 



Anthracnose caused by Collctotrichiun rcrculr was reported from 10 of 

 the 59G fields above mentioned. A field very badly affected with anthracnose 

 was found near Lafayette, June 26th., by Allison. The affected plants in 

 this field were already killed at this time. 



Leaf rust (Puccinia triticina) was as usual very severe in Indiana, espe- 

 cially in the southern part of the state. Very heavily infected fields were 

 seen in Martin County, May 28th., and in Hendricks County, June 26th. 

 I>eaf rust was reported from 214 or 35% of the 596 fields examined in the 

 federal survey, with an average incidence of 1.4% and a maximum of 75%. 

 It is probable that leaf rust occurred to some extent in all fields, however. 



Stem rust {Pmcinia (jraminis) was reported from 202 or 33% of the 596 

 fields above mentioned, with an average incidence of 6.2% and a maximum 

 of 100%. This rust was not epidemic except in the neighborhood of bar- 

 berries. Pipal reports cases of epidemic outbreaks near barberries in 

 Randolph, Spencer, Knox, and Lagrange Counties. 



Bunt or stinking smut caused by Tillefia fdctuiix was reported from 90 

 or 15% of the 596 fields above mentioned witli iiii nverage incidence of less 

 than 1%. Pipal reports that the disease was serious only in the northeast 

 corner of the state (Steuben and Lagi'ange Counties). As to the control 

 of the disease it is of interest to note that out of 39 fields planted with seed 

 treated with wet formaldehyde, bunt was found in seven and in these cases 

 to the extent of not over 1%. Out of eight fields planted with seed treated 

 by the dry method (formaldehyde), a trace of bunt was found in 1 field. 

 In the 45 fields for which the seed was treated by the hot water method, 

 bunt was found in only one field, and only to the extent of 1%. 



This season was especially favorable to loose smut caused by UstUago 

 tritici and the disease was especially prevalent. According to Pipal's obser- 

 vations and to the results of the federal cereal disease survey, it was found 

 in 760 fields in the state with an average incidence of about 3% and a 

 maximum of 30%. Loose smut was most severe in the area comprising 

 the following counties : Morgan, Marion, Hancock, Shelby, Rush, Barthol- 

 omew, Decatur and Jennings. The greatest losses were suffered in Shelby 

 County where the average infection, according to Pipal, on 33 farms ob- 



iPrevalence of the loose smut of wheat in Indiana in 1919. Proc. Ind. Acad. Sci. 

 1919. 



