462 Report op the Mycologist op the 



(13) Cuttings soaked one-lialf hour in potassium sulphide solu- 

 tion, 1-134, rooted better and were more vigorous than untreated 

 cuttings. Stronger solutions wrought injury. 



(14) An attempt was made to cure rusty plants by weekly 

 sprayings with potassium sulphide solution (1 oz. to 1 gal.), salt 

 solution (8 lbs. to 45 gal.) and salt solution used alternately 

 with copper sulphide solution (1 lb. to 45 gal.). All completely 

 failed to cure rust. 



^15) An attempt was made to prevent rust by weekly sprayings 

 with potassium sulphide solution (1 oz. to 1 gal.), copper sulphate 

 solution (2 lbs. to 45 gal.), salt solution (8 lbs. to 45 gal.) and 

 Bordeaux mixture (l-to-7^ formula). At " lifting " time the per- 

 centage of rusty plants on potassium sulphide plot was 43^ per 

 cent.; on copper sulphate plot 42 per cent.; on untreated cut- 

 tings, salt and Bordeaux mixture plots 100 per cent. 



(16) We know of no fungicide which will cure rusty plants, 

 nor of any method of wholly preventing infection in the field. 



(17) Plants in the field are very liable to infection from neigh- 

 boring fields. 



(18) Plants grown all summer under glass are easier to manage 

 as regards rust. 



(19) Mr. Ward's device for spraying the lower leaves of large 

 plants in the bench is an excellent one. 



(20) Some knapsack sprayers are soon " eaten out " by potas- 

 sium sulphide. Buy those which are made of copper. 



(21) The greenhouse can be so managed that rust will give no 

 trouble, even when susceptible varieties are grown. 



(22) It has been proven by experiment that rust will spread 

 among mature plants. 



(23) Exposure to the fumes of burning sulphur for one hour 

 killed rust spores. 



(24) Varieties differ greatly in their susceptibility to rust. The 

 reason for this is not known. The variety Wm. Scott is nearly, 

 but not absolutely rust-proof. Uncle John is probably the most 

 susceptible of all varieties. 



