CHESTNUT IJLIGHT CONTINUES 



417 



AFFECTED CHESTNUT TREES 

 THESEjTREES ARE BEING SPRAYED WITH BORDEAUX MIXTURE IN THE EFFORT TO SAVE THEM FROM THE BLIGHT. 



bined, 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 Agriculture, through the effi- 

 cient help of Dr. Haven Metcalf, 

 Pathologist of the Forestry Bureau, 

 offers much encouragement through its 

 research work upon the blight and a 

 long line of experiments in several 

 lal (oratories. 



The bibliography of the chestnut-tree 

 bark disease shows the wonderful in- 

 terest that this new enemy of the chest- 

 nut has alreadv aroused. Over 300 



publications 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 exhaustive that 

 has been prepared by any State up to 

 this period. Its practical field work 

 attracted widespread attention, and 

 there is ample occasion to express the 

 regrets of the thousands of disappointed 



