J. V. Eyre and E. 8. Salmon 487 



Ex'per. 3. Four leaves (each covered witli numerous "powdery" 

 patches of mildew) at two nodes were sprayed with the tw^o following 

 solutions, (a) and (b) — one leaf at each node being used for each solution. 

 ('/) Solulion containinfi 0-3 % liver-of-sulphiir (0-13 % S.8.) and 



1 % soft soap, 

 (b) Solution of yellow fiinmoniuni siilpliide containing 0-16% S.S. 



and 1 % soft soap. 

 1st daij. (a) and (/;) Mildew cheeked. 



2nd diijj. (a) All the patclies showing renewed growth and developing very 

 numerous conidiophores. 



(h) All the patches dormant and sterile. 

 5th da I/. ■(") Most of the patches now "powdery"; the remaining patches 

 "subpowdery." 



(6) As on the 2nd day. 

 Ith daij. (a) and (b) As on the 5th day 



Wth day. (a) All the patches of mildew a.s vigorous and as "powdery" as though 

 they had never been sprayed. 



(6) All the patches now dead or dying. 



Exper. i. Opposite leaves bearing numerous "powdery" patches 

 of mildew were sprayed with 



(a) Solution containing 0-3 % li re r-of -sulphur (0-13 % S.S.) and 



1 % soft soap. 



(b) Solution of gelloxv ammonium sulphide coyitaining 0-08% S.S. 



and 1 % soft soap. 

 It was noticeable that the spray did not permeate so well in {a) 

 as in [b). When the spray was dry, the mildew patclies on the leaf 

 sprayed with [a) were white in coloiu-, and showed numerous erect 

 conidiophores ; with (6) the patches were a dingier white, and nearly 

 all the conidiophores had collapsed. 



1.5^ da 11. (a) Mildew apparently vigorous and growing. 



(6) Mildew apparently dormant. 

 3rrf daij. (a) and (h) As above. 

 5th day. (a) Mildew now showing erect clustered conidiophores. 



(6) Mildew still dormant and sterile. 

 9//( day. (a) The patches of mildew now "powdery." 



(/*) The patches of mildew dormant and sterile. 

 I'ltti day. («) and (6) As above. 



Exper. 5. Solution containing 0-4 % liver-of-sulphiir (0-17 % S.S.). 



\st day. Mildew shghtly checked. 



■ith day. Many patches now with vigorous erect conidiophores. 



dth day. Most of the patches "powdery" or "subpowdery." 



