206 Proceedings of Indiana Academy of Science 



Corn. — Hoffer found that root and stalk rots, caused by Gibberella 

 and Fusarium species, were less prevalent than usual, as were also the 

 ear rots due to Fusarium and Diplodia. Hoffer and Trost (8) have 

 found that excess iron and aluminium compounds in the soil predispose 

 the corn plant to infection, particularly at the nodes. 



Smut {Ustilago zeae) was less prevalent than usual. 



Rust (Pucdnia sorghi) occurred to a slight extent. One case of 

 brown spot due to Physoderma zeae-maydis was found by J. F. Trost. 

 Bacterial wilt caused by Aplanobacter steivartii was found abundantly 

 on sweet corn in home gardens, and was favored presumably by the 

 hot weather. 



Cowpea. — The bacterial spot disease (5), caused by Bacterium vig- 

 nae, was widespread, probably because it is seed-borne. Powdery mil- 

 dew was very destructive on cowpeas grown in a greenhouse. A few 

 mosaic plants were found in Knox County. 



Cucumber. — Wilt caused by Bacillus tracheiphilus and mosaic are 

 the worst diseases of both garden cucumbers and the pickle crop. Mo- 

 saic has become so prevalent in its weed hosts that cucumber growing is 

 unprofitable in many localities. As a result of seed disinfection, angular 

 leaf spot, due to Bacterium lachi-ymans, is no longer destructive in the 

 pickle crop. Anthracnose occurred in certain greenhouses. 



Currant. — Root rot, caused by Fames nbis, was found in Jefferson 

 County by Cullinan. 



Eggplant. — Leaf spot, caused by Phomopsis vexans, and a serious 

 wilt disease were of common occurrence. 



Grooseberry. — Anthracnose, caused by Pseudopeziza ribis, was de- 

 structive locally. 



Grape. — Black rot, caused by Guignurdia bidwellii, was found on 

 the green fruit in a sprayed vineyard in Brown County on July 26. 

 Dead-arm, caused by Cryptosporella viticola, was destructive early in 

 the season and was reported fi*om four localities. 



Kale. — Yellows, due to Fusarium conglutinans, was noted in Marion 

 County in May. 



Lettuce. — Downy mildew (Bremia lactucue) was destructive in 

 greenhouses, as was also drop due to Sclerotinia libertiana. Leaf-spot, 

 caused by Septoria consimilis, was found serious in market gardens in 

 October. A stunting due to an excess of soluble salts in the soil occurs 

 commonly in greenhouses. 



Mustard. — Mosaic was noted in market gardens in October. 



Oats. — The smuts (Ustilago avenae and U. levis) caused the usual 

 loss. Crown rust was serious and stem rust was noted. 



Onion. — Smut (Urocystis cepulae) occurred in Lake and Jasper 

 counties (7). Smudge (Colletotrichum circinans) was noted in market 

 gardens. The U. S. Bureau of Markets reported black mold (Asper- 

 gillus niger), blue mold (Penicilliuvi sp.) , neck rot (Botrytis sp.) , Fu- 

 sarium rot, and bacterial soft rot in car-lot shipments from Indiana. 



New Zealand Spinach. — A leaf spot caused by a species of Cerco- 

 spoi'a was found in October, 



