New York Agricultural Experiment Station. 481 



Lot I consisted of 32 plants of »Daybreak, 80 plants of Michi- 

 gan and 10 plants of No. 54. They were sprayed once per week 

 with salt solution, 8 pounds of salt to 45 gallons of water. While 

 these plants were kept in the house (March 4 to May 27) they were 

 never free from rust and by May 22 they showed considerable 

 rust. May 27 all rusty leaves were removed and the plants set 

 in the fields. In an examination made July 15, rust was found 

 on 1 plant of Daybreak, 65 plants of Michigan and on none of 

 No. 54. 



Lot II consisted of 32 Daybreak, 80 Michigan and 10 No. 54, 

 This lot was sprayed weekly — alternately with salt solution 

 (8 lbs. to 45 gal.) and copper sulphate solution (1 lb. to 45 gal.). 

 While indoors there was constantly a considerable quantity of 

 rust. May 27 all rusty leaves were removed and plants set in 

 the field. July 15 there was 1 rusty plant of Daybreak, 74 of 

 Michigan but none of No. "54. 



Lot III consisted of 32 Daybreak, 93 Michigan and 10 No. 54. 

 This lot was sprayed weekly with potassium sulphide solution 

 (1 oz. to 1 gal.). While indoors the plants shovv'ed considerable 

 rust. May 27 all rusty leaves were removed and the plants set 

 in the field. July 15 rust was found on 4 plants of Daybreak 

 and on 79 of Michigan but on none of No. 54. 



Lot IT consisted of 32 Daybreak, 80 Michigan and 14 No. 54. 

 This lot was not sprayed at all. The plants showed consider- 

 able rust while indoors. May 27 all rusty leaves were removed 

 and the plants set in the field. July 15 rust was found on 6 Day- 

 break, 68 Michigan and 1 No. 54. 



It will be observed that there was no appreciable difference 

 between the untreated and treated plots as regards the num- 

 ber of rusty plants, notwithstanding the fact that the treated 

 plots had been sprayed once per week from March 4 to July 15. 

 At the latter date we gave up all hopes of curing the plants and 

 burned the entire four lots. Had the fungicides used possessed 

 any value as curative agents, some benefit should have been man- 

 ifest on the plants sprayed faithfully for eighteen weeks. 

 31 



