No. 13. Smnl 



twig' of chestnut with enhirgtiuent ilue to disoase. 

 the normal size of the twig is shown. 



At tlie left side 



Xiirnial 



■liestnur leaf. A pale gici'ii in tin' 

 symptoms of discoloration an. I (li.- 



margin 



;ease. 



is one of tlie first 



