210 Proceedings of Indiana Academy of Science 



maple anthracnose {GloeospoHiim apocryi)tu))i) extremely serious and 

 widespread, occasioning numerous inquiries from seven counties; maple 

 tar-spot (Rhytisma accriniDn) in Whitley County; maple sunscald and 

 drouth injury of leaves very prevalent owing to the hot dry weather; 

 and sycamore anthracnose {Gloeosponum nerviseqnum) causing defolia- 

 tion in May. 



Ornamentals.— Among ornamentals the following diseases occurred: 

 a bacterial soft rot of calla lilies in a greenhouse; carnation rust 

 (Uromyces caryophilimis) in greenhouses; the bacterial spot of 

 geraniums, due to Bacterium erodii, in greenhouses at Lafayette; the 

 hard rot of gladiolus, due to Septoria gladioli; hollyhock rust {Puc- 

 cinia vialvaceanim) ; the Botrytis blight of peonies; rose powdery mil- 

 dew {Sphaerotheca pannosa) , which was very destructive and occasioned 

 inquiries from eight counties; rose black spot, due to Diplocarpon rosae; 

 snapdragon rust (Puccinia antirrhini) , which was very serious; and 

 sunflower downy mildew (Plasmopara halstedii). 



Summary. 



The diseases of outstanding economic importance wei'e the Fusarium 

 soil troubles, the mosaic diseases, apple scab, blotch, and rust, cherry 

 leaf spot, clover powdery mildew, peach bacterial spot and sunscald, 

 potato leaf roll, raspberry anthracnose, and the cereal leaf rusts. Clover 

 powdery mildew attracted the most attention. 



The diseases found in 1922 which have not been previously recorded 

 for Indiana in the Academy Proceedings are as follows : Lima bean 

 stem rot — Sclerotinia libertiana; calla lily bacterial soft rot; cauliflower 

 stem rot — Sclerotinia libertiana; cowpea mosaic; currant root rot — 

 Fomes ribis; geranium bacterial spot — Bacterium erodii; gladiolus hard 

 rot — Sejitoria gladioli; meadow fox tail leaf spot — Scale cotrichum 

 graminis; mustard mosaic; New Zealand spinach leaf spot — Cercospora 

 sp. ; peach sunscald; peony blight — Botrytis sp. ; pepper bacterial spot 

 — Bacterium vesicatorium; plum crown gall; strawberry stem rot- — 

 Sclerotinia sp. 



Literature Cited. 



1. Brown, H. D., and Gardner, Max W. Lightning injury to 

 tomatoes. Phytopath. 13:147. 1923. 



2. Gardner, Max W. Indiana plant diseases, 1919. Proc. Ind. 

 Acad. Sci. 1919:135-156. 1921. Indiana plant diseases, 1920. Same, 

 i 9.20: 187-208. 1921. Indiana plant diseases, 1921. Same, 192.i: in press. 



3. , Greene, Laurenz, and Baker, Clarence E. A))ple blotch. 



Purdue Univ. Agr. Exp. Sta. Bui. 267:1-32. 1923. 



4. , and Kendrick, James B. Tomato mosaic. Purdue Univ. 



Agr. Exp. Sta. Bui. 261:1-24. 1922. 



5. and . Bacterial spot of cowpea. Science 57:275. 



1923. 



6. and . Bacterial spot of tomato and pepper. 



Phytopath. 13:307-315. 1923. 



7. Gregory, C. T. Onion smut in Indiana. Proc. Ind. Acad. Sci. 

 1922:318-320. 1923. 



