Fig. 2rt.— Showing the result of inoculating 

 a terminal shoot with a pure culture 

 of the Fire Blight organism by punc- 

 ture at the point. «. 



Fig. 2&.— Showing the blighting cf a ter 

 minal shoot bj- inoculation of the ter- 

 minal bud with a pure culture of the 

 Fire Blight organism.^, (After Chester). 



HLaw^nXi 



-•H. ^.-'u . >^Yfif^<: 





•# • 



^ ^ 



I 



Fig. 3. — Cross section of a one and two year old stem. Fire blight 

 bacteria grow in the cambium (c) and inner bark (F). E— epi- 

 dermis. Co— Corky layer, B — Bast fibres, P — Parenchyma. C — 

 Cambium. X — Xylem or woodjMissue. M — Medulla or pith. 



[7] 



Fig. 4.— Fire Blight bac- 

 teria (B. amylovorum.) 



X2000, 



