KKYsll'HKAK. 



171 



The operation is done 1'}' hand or l>y special implement. < >ne 

 of the best known of these is the " Sulphur 1'utl." Tin- 

 consists of a brush with a hollow stem t< contain tlowei> of 

 sulphur, the end of the stem bein.u perforated to allow the 

 sulphur to escape on to the plant. Sulphuring must ! 

 carried nut during dry weather to prevent the powder bi-ini: 

 washed away. It has also to be frequently repeated, so that 

 youn^ ^ rowing shoots, flowers, fruits, leaves, and all parts 

 liable to attack, may be kept well dusted. Sulphur prevents 

 germination of conidia on the leaves; it al-o kills the 

 mycelium, while the plant itself remains uninjured. 



Besides sulphuring, various copper solutions -.ive verj -ood 

 results, while at the same time they act as a preventive 

 against the false mildews ( /Ws//,ny/^/^, Peronospora, etc.). 



Sphaerotheca. 



I'erithecia spherical with thread-like appendages; they 

 one s})herical ascus with ei^lit colourless oval ascospores 



PK 



I 1 1 1 > 1 1 1 1 1 1 ! 

 i ml. 'I up. (v. 'I'ul.i Hi | ' 



