Indiana Plant Diseases, 1921 189 



7. Crown gall on raspberry plants was sent in from Clark, Putnam 

 and Noble counties. 



Rhubarb. — Leaf-spot, attributed to AscocJiyta rJiei, was found preva- 

 lent in the Indianapolis market gardens in May and was noted in July 

 near Lafayette. 



Rye. — Anthracnose, due to Colletotrichum, cei-eale, caused very heavy 

 losses in rye this year. Specimens were received from a grower in 

 Lagrange County on June 14 showing that affected plants were stunted 

 and were dying prematurely. The heads were light colored and the grain 

 was not filled out. There was some anthracnose infection of the heads 

 causing the portions above the point of infection to dry out, but most 

 of the infection. occurred at the lower nodes, on the first internode and 

 on the roots. These lesions bore setose, sporulating acervuli. The 

 grower reported that in a seven acre field about one-third of the plants 

 were thus affected, that in an adjacent rye field planted two weeks later, 

 only a few dead plants had appeared, and that, in another adjacent rye 

 field planted one month later than the first field, many dead plants were 

 visible in the portion adjacent to the first field. 



On June 18, Kendrick found anthracnose causing heavy losses near 

 Wanatah. In one 50 acre field, 40 to 60 per cent of the plants were dead 

 and in another of 60 acres, 5 to 10 per cent of the plants were dead. 

 Gregory found the disease severe in Perry County on June 20, and 

 reported one field practically ruined and a similar occurrence was re- 

 ported from Switzerland County. Mains observed the disease in Law- 

 rence County. Jackson found a destructive foot-rot of rye which was 

 not due to anthracnose in a field in Stark County on June 21. Among 

 the several types of fungi isolated from root segments and lower nodes 

 was an orange-yellow type of Sclerotium. As has been previously pointed 

 out, the mild open winter and warm, wet spring iDrobably favored 

 anthracnose and foot-rot of rye. 



Mains reported that leaf rust {Puccinia dispersa) was prevalent 

 this season and considerable loss was attributed to its attack. Hosmer 

 found portions of two rye fields, one in Steuben, the other in Lagrange 

 County, ruined by stem rust (P. graminis) , and in both cases barberry 

 bushes were found near by. Ergot was reported from Switzerland 

 County. Two heads of the rare loose smut were found in Kosciusko 

 County. 



Soybean. — Bacterial blight caused by Bacterium glycineum is car- 

 ried with the seed and, like bean blight, is practically co-existent with 

 the crop. The disease occurred in fields near Lafayette and was re- 

 ported from Greene County. The causal organism has been studied in 

 culture and found to be the non-chromogenic strain of Bact. qlycineuvi 

 (29). 



Mosaic (22) was found to a limited extent. Attempts to infect field 

 beans with soybean mosaic were unsuccessful, as were also attempts to 

 infect soybeans with mosaic from field beans, from Adsuki bean, and 

 from red clover. A spotting of the older leaves of the varieties Black 

 Eyebrow, Dunfield and Ito San with which a Macrosporium was asso- 

 ciated was noted ai Lafayette. An objectionable lavender staining of 

 the seeds of certain varieties was found to be due to fungus invasion 



