50 



Parasitism and Immunity. 



Table I. — Relative Susceptibility to Stinking Smut of Florence and 



Genoa. 



Variety. 



Inoculation of Seed witli— ' Smutty. 



Smutty. 



7. — Burnley. 



T. tritici 

 T. levis 



T. tritici 

 T. levis 



Florence . . 

 Genoa 

 Florence . . 

 Genoa 

 Florence . . 

 Genoa 

 Florence . . 

 Genoa 

 Florence . . 

 Genoa 



Florence . , 

 Genoa 



Florence . 

 Genoa 



Florence . 

 Genoa 



Florence 

 Genoa 

 Florence 

 Genoa 



j Florence 

 Genoa 



General Average 



T. levis — General Average 



//. — Dookie. 

 T. levis .. 



T. levis, re- smutted 



T. levis . . " 



T. levis, re- smutted 



General xA.verage 



T. levis — General Average 



T. levis, re- smutted 



III. — Longerenong. 

 T. levis .. 



General Average 



I. Burnley. — There were seven plots of each variety sown, in two of them 

 the ordinary seed was used as a check, while in the others the seed was 

 thoroughly dusted with bunt-spores. Both T. tritici and T. levis were used 

 for infection, but no conclusions as to their relative virulence could be drawn 

 from the results of a single season's experiments. The general average for 

 the whole of the plots was over 5 per cent, for Florence, and over 6 per cent. 

 for Genoa. If the comparison is strictly confined to the plots in which T. levis 



