PLATE II. 



Tii^. 1. 



Fig. 2. 



Fig. 3. 



Fig. I. 



l-'ig. .">. 



FiiT. (L 



/ 



C.itriis cunker spots on grapefruit leaves, iialural in- 

 fection. 



Spongy, wliite, ])r()niinenlly ])ro.je('ting cankers on 

 leaf and twig of grapefruit. i'lant inoculated with 

 ])ure culture and continuously kej)! in a inoisi atmos- 

 phere. 



Infection resulting from inunersion of leaf in suspen- 

 sion containing Pseudomonas citiM. Cankei-s occupy 

 nearly the whole of ihe lower leaf surface. 

 Natural infection on Citrus trifoliata leaf. 



Suspension of Pseudomonas citri ai)plied with an 



atomizer to Satsuma orange leaves, with I'esultant 



canker. 



Old cankeis on Satsuma leaf. 



