CHESTNUT DLIGHT CONTINUES 



417 



Affected Chestnut Trees 

 these^trees are being spr.^yed with bordeaux mixture in the effort to save them from the blight. 



1 lined, was all that was needed to keep 

 under control the pernicious San Jose 

 scale, which at one time had threatened 

 to exterminate every apple tree in Penn- 

 sylvania. The United States Depart- 

 ment of Agrictilture, throu<,di the effi- 

 cient help of Dr. Haven Metcalf, 

 Tathologist of the Forestry Bureau, 

 offers much encouragement through its 

 research work upon the blight and a 

 long line of experiments in several 

 laboratories. 



The l)ibliogra])hy of the chestnut-tree 

 bark disease shows the wonderful in- 

 terest that this new enemy of the chest- 

 nut has alreadv aroused. Over .'"00 



pu])licalions are quoted, and the numer- 

 ous writers all agree upon the general 

 opinion that the blight is a most diffi- 

 cult disease to control and eradicate. 

 Those engaged in genuine field work 

 formed the same belief at the very out- 

 start of their task, although there was 

 a material difference as to the methods 

 of treatment, etc. Pennsylvania's lit- 

 erature relating to the blight will be 

 the most complete and exhatistive that 

 has been prepared by any State up to 

 this ])eriod. Its practical field work 

 attracted widespread attention, and 

 there is ample occasion to express the 

 regrets of the thousands of disappointed 



