J. V. Eyre axp E. S. Ralmox 501 



SiimjHcirj/ of Ohsercations. VII. 



As it is impossible to use soaj:) with lime-sulphur solutions, it was 

 decided to substitute saponin so as to make the experiments comparable 

 as far as ^lossible with those where soap was used. At 1-005 sp. gr. 

 the lime-sulphur solution was either quite, or was very nearly, fmigicidal ; 

 at l-Ol sp. gr. it was almost invariably so. 



These results are corroborative of the results previously obtained 

 by one of iis^ in certain experiments in which lime-sulphur at 1-01 sp. gr. 

 proved completely fungicidal against »S. Hinidih. killing the growing 

 fungus and preventing infection of the leaf bv conidia. 



VIII. Iron Sulphide. 

 Hops. 1914. 



Exper. 1. Solution containing 0-2 °o iron sulphide. 



1st day. Mildew only sHghtly checked ; conidiophoies stiD mostly eiect. 



3rd day. Some of the patches (perliaps those wliere the spray did not permeate) 



now ahnost "powdery''; others still checked. 



bth day. The majority of the patches now with numerous erect conidiophores. 



llh day. A considerable number of the patches now "powdery." 



Exper. 2. Solution containing 0-2 % iron sulphide and 0-25 % 



saponin. 



\sl day. Milde%%- only slightly checked ; conidiophores still mostly erect and 

 vigorous. 



Zrd day. Some of the patches nearly "powdery." 



oth day. Most of the patches now with very numerous erect conidiophores. 



1th day. All the patches now "powdery" or nearly so. 



Exper. 3. Solution containing 0-2 % iron sulphide and 1 °o soft 

 soap. 



1.^1 day. Mildew checked. 



3rd day. All the patches still moie or less checked. 



5th day. The patches now shoeing very numerous erect conidiophores. 



~th dny. All the patches now "powdery" or nearly so. 



Exper. 4. Solution containing 0-3 % iron sulphide and 0-5 % *'"/' 



soap. 

 Isl day. Mildew much checked : a few scattered short conidiophores visible. 

 3rd day. All the patches quite dormant and apparently dying. 



' Salmon, E. S., "Report on Economic Mycology" {Joiini. S.-E. Agric. Coltegp.. xix. 

 p. 345 (1910)). 



