302 Keport of the Horticulturist op the 



experiments,* spraying slionld~begin soon after the fruit sets and 

 continue at intervals of about two weeks till the fruit begins to color. 

 To avoid spotting the fruit, no further spraying is done till the fruit 

 is picked when one or two further applications are made. 



So far as I have observed the leaf spot disease does not usually 

 work much injury in this State before midsummer, so that two 

 thorough applications of Bordeaux mixture, the first made as soon 

 as the fruit is picked and the second about two weeks thereafter, 

 will probably be siiificently to control the disease. This opinion is 

 based on general observation and not on definite experiments. 



Leaf disease of Mack currants. — It should be remembered that 

 the European black currants though not troubled by the currant 

 worms (saw-fly larvee) which are so destructive to foliage of other 

 currants, may be seriously affected with the leaf blight. Some- 

 times they are nearly defoliated by it in late summer or autumn. 

 Spraying with Bordeaux mixture has given good results in treating 

 this trouble the same as in treating the leaf disease of red currants. 



Dying of canes. — In 1891, Mr. D. G. Fairchild's attention was 

 called to a dying of currant canes which was caused by a parasitic 

 fungus which infested the cane. The disease was then reported 

 from a district along the Hudson. During the past season a similar 

 trouble, probably identical with that which Mr. Fairchild observed, 

 has been reported to the Station by a fruit grower in the Hudson 

 river valley. The diseased canes were submitted to Mr. F. C. 

 Stewart of the Station staff in the second judicial department, who 

 found mycelium very abundant in both pith and cambium. He 

 has not yet determined the life history of the fungous parasite and 

 has as yet no remedies to suggest. Dr. Halsted, Botanist of the 

 Kew Jersey Experiment Station, in his annual report for 1894, 

 page 32Y, speaks of fungi parasitic on currant canes, one a species 

 of Nectria., and one a species of Homostegia. He recommends 

 cutting out the diseased parts. 



Prejyaration and application of remedies. — A more complete 

 discussion of the preparation and application of Bordeaux mixture, 

 Paris Green or London Purple, Hellebore, etc., is given in another 

 portion of this report. 



BLACKBERRIES AND DEWBERRIES.. 

 In common with many other plantations of blackberries in 

 various parts of the State, the blackberries at this Station were 



♦ Pammel, L. H., Bull. 17, Iowa Expt. Station, 419-421; Bull. 20, 716-718; Bull. 30. 289-391. 



