1921.] 



I [()!>-" Moi l. I) ' ' AND ITS ( 'o.NTKOI, 



157 



required — a strength which would cause too serious a " scorch- 

 ing " of the hop-plant in summer. In common practice, the 

 " liver of sulphur " solution is applied with the wash (usually 

 soft soap and quassia) that is being used against the " greenfly " 

 (Aphis) . If this wash contains a higher percentage of soft soap 

 than 10 lb. to the 100 gal., it is possible thai good results are 

 obtained in checking, if not killing, the " mould," since it has 

 been found that " liver of sulphur " solutions become more 

 potent when used with greater amounts of soft soap. It is ques- 

 tionable, however, whether sufficiently strong solutions of " liver 

 of sulphur " (with soft soap) to kill " mould " could be used on 

 hops either when in " burr " or just before (when the " pin " 

 is showing) without causing serious " scorching " injury.* 

 Strong solutions of " liver of sulphur " and soft soap, or the 

 lime-sulphur wash (1 lb. of the concentrated wash to 29 gal. of 

 water) can safely be used on the hop-leaves early in the season, 

 but except in special circumstances their use would not prove 

 economical. It is quite certain that at present " flowers of 

 sulphur " must be regarded as the one safe and certain remedy 

 against " mould." ■ 



{To be concluded.) 



* The same danger would attend the use of the Lime-sulphur or the amm mium 

 polysulphide wash. 



