DISEASE RESISTANCE IN ANNUAL CROPS 



51 



KATAHDIN 



A. 



RESISTANCE 



1 



CAPPELLA 



Figure 8. Uniform resistance at low (A) and high (B) levels 

 as demonstrated by resistance spectra for interactions of 

 potato cultivars Katahdin and Capella with several races of 

 Phytophthora infestans (after van der Plank, 1963). 



