208 Proceedings of Judiuita Academy of Science. 



ill the uorfhcn-n third of tlie state and its occurience locally seemed to be 

 associated with certain threshing rings. 



Loose smut of wheat was not as prevalent as in 1!)19. While- the average 

 loss was about 2 per cent, in certain fields as high as 25 per cent of loose 

 smut was found. Pipal reports that in 400 demonstration fields a practically 

 perfect control was obtained by the hot water treatment while an average 

 of 5.1 per cent of smut occurred in the check fields. The central treating 

 plant control method is meeting with marked success. 



Summary. 



The plant diseases of outstanding ecoiioiuic importance as observed during 

 the 1920 season are as follows : 



Apple blotch : scab ; black rot : ( hail injury). 



Aster t'usarium wilt. 



Bean Itacterial blight ; mosaic. 



Cabbage yellows . 



Cantaloupe bacterial wilt : loaf-blight : mosaic. 



Celery early blight : bacterial spot. 



Cherry Coccomyces leaf-spot. 



Corn Fusarium root, stalk and ear infection : smut. 



Cucumber bacterial wilt : mosaic. 



Kale yellows. 



Onion (sets) smut. 



Peach leaf curl ; black spot. 



Pear fii'e blight. 



Plum brown rot. 



Potato Fusarium wilt ; ho|>perburn or tipburn. 



Raspberry anthracnose. 



Soybean bacterial blight . 



Tomato Septoria leaf-spot; Fusarium wilt: mosaic; blossom- 

 end rot : infected growth cracks. 



Watermelon. Fusarium wilt. 



Wheat loose smut ; stinking smut. 



Plant diseases found in 1920 which have not been previously recorded 

 for Indiana : 



Apple water core. 



Barley bacterial blight caused by Bacterium translucens ; 



leaf-spot caused by Rhynchosporium secalis. 



Bean lOot rot due to Fusarium species. 



Beet nematode root-knot. 



Carrot nematode root-knot. 



Cauliflower yellows caused by FKstar'nnii roiif/Jiitinanx. 



Ohry.santhemum leaf-spot due to Scptorid chriixdiitlKniclhi. 



Corn Pliysoderma zeae-inai/dis. 



Cucumber nematode root-knot. 



Larkspur Hclerotium rolfsii. 



Lettuce nematode root-knot. 



Oats Halo blight caused l)y Bacterium coronafacicns. 



Parsnip neinatodo root knot. 



Peach die-back ( I alsu leucoHtoma ) . 



Pear sooty blotch 



Soybean. bacterial blight caused by Bacterium (ilycineum (prev- 

 iously noted. Plymouth, 1918) ; mosaic. 



Spinach blight or mosaic. 



Squash bacterial wilt. 



Sweet potato scurf caused by Monilochaetes infuscans; Fusarium 



stem rot. 



Tomato white spot or bird's-eye spot (cause unknown). 



Turnip.!.' mosaic. 



