I04 



but are most abundant m the summer. Our knowledge 

 of the hfe-history of this ]\Iite is incomplete, we still 

 require definite information as to whether the species can 

 pass the winter elsewhere than m the buds — whether it can 

 survive under the bark, m the roots, or beneath the soil. 



With regard to remedial measures, so far as I am 

 aware, no completely successful methods of treatment have 

 yet been devised. Instances are known where all diseased 

 bushes in a plantation have been cut down, the stumps and 

 root stocks subjected to treatment, and yet the young 

 shoots came up infested with this ]\Iite. It is of first 

 im^portance to cultivate from perfectly clean stoek, and 

 cuttings taken for setting should also be selected from 

 such plants. Hand picking of the infected buds at the 

 end of winter is valuable, and all buds collected should 

 be burned as soon as possible; with badly infected shoots 

 extensive pruning is necessary. When the bushes are very 

 badly infected there is no remedy beyond taking up and 

 burning them, followed by replanting with clean new 

 stock. Spraying or dusting with a mixture of lime and 

 sulphur during the migratory period has been recom- 

 mended, but often the results are unsatisfactory. An 

 efficient spraying mixture still remains to be discovered. 

 Some varieties of currant are claimed to be less severely 

 attacked than others, and among them may be mentioned 

 the Boskoop Giant, Lee's Prolific, and Edina. Varieties 

 claimed to be immune have been placed on the market, but 

 whether they will remain so time alone will determine. 

 There is a 'possibility that careful selection and inter- 

 crossing of likely varieties along scientific lines may lead 

 to the production of resistant stock. 



