296 BUSE-FBUITS 



avoid all plants showing indications of the disease, or to eradicate 

 them at once, if found growing in the field. To combat a dis- 

 ease with the cause unknown is to fight an enemy in the dark. 

 Yet many such problems confront the grower, for the solution of 

 which he must look to the student and the specialist. 



LESS PROMINENT DISEASES 



In addition to the species mentioned in the pre- 

 ceding pages, many others have been reported upon 

 different Rubus hosts. The greater part of these are of 

 little or no economic importance. The following enu- 

 meration is designed as a mere reference list for the 

 benefit of the student. The species are arranged ap- 

 proximately in systematic order, according to Sac- 

 cardo's classification, with the most available refer- 

 ences to the literature of each. The hosts given are 

 simply those upon which the species is known to have 

 been found. Though as full as practicable to make 

 it, no claim is made to completeness in the enumer- 

 ation, either of species or of hosts. Since the genus 

 Rubus is so largely a European one, and since this 

 work aims to deal with it only as found in North 

 America, only those species reported from North 

 America are included. 



Little attempt has been made to decide questions 

 of nomenclature or synonymy. That battle is left 

 for those better able to fight it. The nomenclature 

 follows Saccardo's "Sylloge Fungorum," since that can 

 be taken as a standard throughout, while most other 

 works deal only with special groups, and hence are 

 but fragmentary so far as this list is concerned. 



