New York Agricultural Experiment Station. 345 



Table I gives the plan and results of the experiments, and 

 includes: Hosts from which cultures were obtained; kinds of 

 trees inoculated; number of inoculations made; growth of 

 fuxigus where inoculated. 



Table I. — Growth of Sph^eropsis from Different Sources on 



Hosts f;nm ^\h'"li cultured 

 obtain. d. 

 C Apple tree ] 



Different Hosts. 



Kiiiii ol ..eo inotuattd. 



Appl3 tree. 

 Pear tree.. 



Ilawtborn 



Cratccyus OTyaca >i tli a... 



Apple fruit 



Cheek J 



Apple tree ) 



Apple fruit [■ 



Check J 



Apple ti'ee | 



Apple fruit j- 



Check j 



App!^> tree. 

 Apple fruit 



Check J 



Apple tree. 

 Apple fruit 



Check 



Apple tree. 

 Apple fruit 



Check 



Apple tree. 

 Apple fruit 



Check J 



Apple tree. 

 Apple fruit 

 Check 



Cultures of SpJiwropsis as obtained from all of the hosts given 

 in the table, save from the peach, were experiment'cd with the 

 previous season, and all were found to produce black rot of apple 

 fruits readily, and all made some growth when inoculated into 

 apple and pear nursery trees. Table I shows that, on the other 

 hand, the canker fungus refused to grow when inoculated into 

 apricot, peach, sunnach, persimmion or hop hornbeam trees. 

 Further experimenting will be necessary before the full signifi- 

 cance of th-ese negative results will be undersitood, but two ways 

 of accounting for them come to mind. The first is that 

 these hosts are, as has been supposed, attacked by different 

 species of SpJicdropsis. In this case, apple fruits must be 

 regarded as a very favorable medium for the growth of these 



