486 FunyicUlal Proprrtlof of Certain Sj>raij- Fluids 



Exper. 0. Solution containing 4 % ammonia and 1 % soft soap. 



\sl day. The mildew much checked on lowest leaf; on the uppermost leaf several 

 of the patches bore short conidiophores. Injury to the lower leaves in the form of 

 slight discoloration (darkening) and curling of the margin. 



'ird (lay. The mildew much checked ; most of the pati:hes on the lowest and 

 middle leaves apparently dead; on the uppermost leaf several of the patches with 

 small groups of conidiophores. Injury more apparent ; the lowest leaf killed and 

 curled at the margins; the middle leaf with injiu'y in the form of small, brown, 

 "burnt" patches of cells; the uppermost leaf not injured. 



llh day. All the leaves now with several patches of mildew bearing vigorous 

 tufts of oonidiophorcs. 



Exper. 6. Solution containing 8 % ammonia and 1 % soft soap. 

 Within two hours of spraying the sprayed leaves had curled, withered, 

 and were dead or dying. 



l.s( day. All the leaves dead and shrivelled. 



Summary of Observations. 111. 



Ammonia at 4 % severely checks the mildew, but docs not kill 

 all the patches; at this strength serious injury is produced to the 

 leaf-tissue. At 2 % slight injury to the leaf begins to be caused, in the 

 form of small "burnt"' areas scattered over the leaf without reference 

 to the disposition of the patches of mildew ; at this concentration 

 ammonia is practically without fungicidal value, some of the patches 

 of mildew becoming almost " jTOwdery '" the second day after treatment. 



TV. " LlVER-OF-SULPHUR^." 



Hops. 1914. 



Exper. 1. Solution containing 0-3 % liver-of-sulphur (0-13 '^J, sulphide 

 sulphur (S.S.)) and 1 % soft soap. 



Ist day. Mildew checked. 



3rd day. Mildew still checked, but a few fresh conidiophores beginning to be 

 developed on some of the patches 



rtlh day. Many of the patches now with groups of conidiopliores. 

 8//( <fa/y. Most of the patches now more or less "powdery." 



Exper. 2. Solution containing 0-3 % liver-of-sulphur (0-13 % S.8.) 



and 0-25 % saponin. 

 I si day. Mildew checked. 



3rd day. All the patches beginning to produce conidiophores 

 (Mil day. .Vll the patches now "powdery." 



• Vide Materials used, p. 478. • 



