DISEASES OF PLANTS. 



61 



A report is ^ven of some studies upon carnation rust. These studies 

 were conducted along 3 lines: (1) effect of chemicals upon the germi- 

 nation of the spores, (2) inoculation experiments, and (3) spraying- 

 experiments. About 250 experiments were conducted with varying 

 strengths of copper sulphate, Bordeaux mixture, ammoniacal copper 

 carbonate, can celeste, iron sulphate, potassium sulphid, potassium 

 chromate, potassium bichromate, lead acetate, corrosive sublimate, car- 

 bolic acid and salt to test their ability to prevent'spore germination. 

 The stronger solutions of all except the last were successful to a greater 

 or lesser degree. The inoculation experiments conducted were success- 

 ful only where the epidermis had been punctured. Exjieriments were 

 conducted for the repression of rust by spraying plants with the 

 strengths of the chemicals above referred to which had proved success- 

 ful in preventing spore germination. When the final examination of 

 the plants was made no injury was percei)tible. 



Experiments for checking apple rot and codling moth in 1895, 

 H. (lAiiMAN {Kentucky Sta. Bill. 59, pp. 113-129, j>?.v. i.) — The experi- 

 ments reported upon in this bulletin were in continuation of tests made 

 during previous seasons with a. view of finding some practicable means 

 for the prevention of the injuries of the apple rot {Spha'vojysis malonim) 

 and the codling moth. It is desirable that applications for both pests 

 should be made at the same time; and the time, number of applica- 

 tions, and strength of solutions should be determined. For the experi- 

 ments of 1895 10 trees were vselected, 5 of which were sprayed, the 

 others being left as checks. The fungicide used in most of the experi- 

 ments was Bordeaux mixture made by the following formula : Copper 

 sulpliate 6^ lbs., lime 3i lbs., water 32 to 33 gals. The author used 1 or 5 

 applications. These were made April 4, May 6,8, and 29, and July 12; 

 or where 4 applications were given the trees, that of May 29 was omit- 

 ted. A heavy rain falling soon after the spraying of May necessitated 

 a second on May 8. Paris green was added to the Bordeaux mixture 

 for every application except the first. 



When the apples were gathered they were assorted into sound ones 

 and those showing attacks of disease. These 2 lots were then inspected 

 for evidence of codling moth attack. In the accompanying table the 

 results of the tests are shown : 



Eesult of spraying to prevent applevot and codling moth. 



aXame of variety not given. 



