DISEASES OF PLANTS. 359 



experiment was made at the station with amraoniacal copper carbonate 

 solution and sulphur on badly diseased plants. The applications were 

 made in the latter part of July. August 15 the rows dusted with sul- 

 phur were somewhat improved and those sprayed with the copper 

 compound showed marked improvement. A second application was 

 made but a heavy rain prevented any results being obtained. 



The late blight, unlike the early, does not disappear with cool 

 weather, but continues in the field until the plants are lifted and then 

 extends its injuries to the storage cellar. The author gives the results 

 of observations made by himself on the blight in storage houses in 

 several localities. The disease at first affects the plants as in severe 

 cases in the field; the outer green leaves wilt and soon the fungus 

 spreads to the younger blanched leaves, wilting and discoloring them. 

 No fungicides were tried, but from the nature of the disease and the 

 conditions affecting its development the author recommends certain 

 remedies. The plants in the field should be sprayed regularly to pre- 

 vent the appearance of the disease. The badly affected leaves should 

 be removed and the leafy portions of the plant might be dipped in a 

 weak solution of ammoniacal copper carbonate before storing the crop. 

 As preventive measures, the storage cellar should be kept but little 

 above freezing temperature, free from excessive moisture, and given 

 good ventilation. 



Remarks are made upon the construction of storage houses with 

 reference to checking the disease. A bibliography oi the celery blights 

 is appended. 



A disease of currant canes, E. J. Durand (New York Cornell Sta. 

 Bui. 125, pp. 23-38, Jigs. 16).— The bulletin treats of the general and 

 botanical characteristics of the disease and of its remedies. The dis- 

 ease is reported to manifest itself in a wilting of the leaves, which turn 

 yellow and fall off', and a premature coloration of the fruits, which 

 shrivel and fall away with the leaves. The denuded canes then die 

 rapidly. Cuttings from apparently healthy canes on a diseased plant 

 made an unusually slow growth. The author gives the history of the 

 fungus Tubercularia vulgaris and its occurrence as a parasite, and 

 describes his study of it and the results obtained. Cultures were 

 made of Tubercularia vulgaris, Xectria cinnabarina, and Pleonectria 

 berolinensis, 3 distinct fungi found on diseased canes. The mycelium 

 of Tubercularia vulgaris spreads abundantly through the currant stem 

 and is destructive to the plant. Nectria cinnabarina is known to be 

 connected with Tubercularia vulgaris, but experiments by the author 

 seem to prove that Pleonectria berolinensis is not in any way connected 

 with Tubercularia vulgaris. 



"The only positive remedy that can be suggested is the removal of 

 the whole plant as soon as the disease begins to be manifested in the 

 yellow foliage and prematurely colored fruits. The diseased plants 

 should be burned, as the spores and conidia may be produced in abun- 

 dance on dead plants and the trouble communicated to living bushes." 



