Department of Plant Pathology. , 41 



by spring'. A large nunil)cr of experiments in the storing of the bulbs 

 are now under way, to determine what relation the storage may bear 

 to the development and severity of the disease. 



Apple-scab fungus. — Mv. Wallace has also been conducting investi- 

 gations of the apple-scab fungus, and has worked out fully most of 

 the points in the life history of this parasite, having added consider- 

 able to our knowledge of the development and dissemination of the 

 winter spores. It is planned to continue this work for several years, 

 taking up the practical and economic phases of the disease as well as 

 the spread of the scab in storage ; late infection of the fruits, which 

 have in certain sections of the State been marked this year; secondary 

 infection by other fungi through the scab spots, etc. 



Hollyhock diseases. — 'An extensive experiment in the control of the 

 diseases of hollyhocks, particularly the rust, was undertaken this 

 spring. Mr. Taubenhaus, a graduate student in the department, had 

 direct charge of the work. Some 130 varieties of hollyhocks were 

 planted on the grounds of the University farm, on which experiments 

 with various colorless sprays were performed. Over two thousand 

 hollyhock plants were included in the experiment, and seven different 

 spray mixtures were tried. The plants were started in the green- 

 house and planted out this spring. Relatively little rust appeared 

 during the present season, so that no conclusions could be drawn in 

 regard to its control. However, anthracnose was very severe on all 

 of the plats. Bordeaux mixture which was used on one of the plats 

 as a check against the other mixtures, showed the most efificiency in 

 the control of the anthracnose, while the other mixtures were effec- 

 tive in the following order: 



Lime sulfur, Niagara brand, i part in 20 of water. 



Copper sulfate, i^^^ solution. 



Ordinary ammoniacal copper carbonate. 



Soda Bordeaux. 



Sulfuric acid. 



Potassium sulfid. 



Tt is intended to continue this experiment another season at least 

 in order to check up the results of the past season and to determine 

 the efTect of these spray mixtures on the rust which is beginning to 

 appear in great abundance late this season, after the spraying has 

 ceased. 



Peach leaf-curl. — Early last spring a circular letter was addressed 

 to many of the peach-growers throughout the State asking for in- 

 formation in recfard to the amount of curl that had occurred on the 



