180 Proceedings of Indiana Academy of Science 



Goshen in September. The relation of weeds to this disease was 

 mentioned in our account of cantaloupe mosaic. It seems probable that 

 the milkweeds, once infected, serve as a perennial source of infection 

 for cucumbers (11), and that this accumulating reservoir of mosaic in 

 the weed flora has driven the pickle-growing industry out of one region 

 after another. 



Angular leaf-spot, due to Bacterium luchri/mans, was found in only 

 one of several pickle fields visited ner.r Plymouth on August 2 and 

 also occurred in a field near Hammond. Anthracnose, due to Colleto- 

 irichum lugenarium, was found in one of the fields visited near Ply- 

 mouth and also, later in the season, in fields near Indianapolis and 

 Goshen. The wet weather of this season of course favored anthracnose. 

 It was again present in the greenhouse where it occurred last year and 

 overhead irrigation was undoubtedly responsible for its prevalence. 



Eggplant. — Leaf-spot caused by Phomopsis vexans was noted on 

 young plants in a market garden near Indianapolis on May 20. A leaf- 

 spot caused by Septoria lycopeysici was found on a few plants in our 

 experimental greenhouse. Phiftophthora terrestris caused a rot of egg- 

 plant fruits' in an experimental garden at Lafayette in September. The 

 fungus had been prevalent on an adjacent plot of tomatoes and very 

 evidently the infection spread from the tomatoes to the eggplants. Wilt 

 was noted near Indianapolis and reported from Logansport. From 

 specimens collected a Sclerotium was isolated. 



Goldenseal. — An outbreak of Botrytis blight occurred in early Sep- 

 tember in Greene County and was probably attributable to the very 

 cloudy wet weather. 



Gooseberry. — Anthracnose caused by Pseudopeziza ribis was noted 

 in Cass County and leaf-spot caused by My coi^phae reiki grossulariae was 

 found prevalent near Lafayette in September. A specimen of powdery 

 mildew {Si>li(t<'rotlieca mors-uvae) was sent in from Putnam County in 

 September. 



Grape. — Black-rot caused by Guignardia bidtrellii was exceptionally 

 destructive this season and specimens of fruit infection were sent in 

 with complaints from .several localities. P. G. Ewald, county agent of 

 Switzerland County, found fruit infection in June and reported that 

 the Concord variety similarly exposed was free from infection. The 

 disease was reported from Allen, Ripley and Dekalb counties in July 

 and from Lagrange County in September. 



Kale. — Yellows caused by Fusamum conglutinans occurs to a con- 

 siderable extent in the Indianapolis market gardens because of the 

 I'ather general soil infestation of the causal fungus, which also causes 

 cabbage yellows. It was found severe on young plants as early as 

 May 25 and was even more severe in July. Both kale and kohlrabi 

 showed considerable drouth injury in July. 



Lettuce. — Downy mildew {Breinia lactucae) occurred to a con- 

 siderable extent in the fall and winter hothouse crops and to a less 

 extent in the spring crops. Preliminary tests of the effect of tempera- 



^ Kendrick, James B. Phytophthora rot of tomato, eggplant and pepper. In Proc. 

 Ind. Acad. Sci., 1922. 



