6 N. J. Agricultural Experiment Stations Bulletin 356 



In this connection, it is interesting to know that a prize of $60.00 

 offered in 1798 for a method of preventing "yellows" was divided 

 between two contestants, both of whom attributed the disease to in- 



Fig. 1. — Tree in Last Stages of Yellows. All Twigs are Dead 

 Except the Typical Yellows Shoots 



sects. The first record of "yellows" that is in any way authentic was 

 in 1791, but there is very little doubt that some of the records pre- 

 vious to that date are for true "yellows." 



In 1806-07, the disease was restricted to an area in the immediate 

 vicinity of Philadelphia, extending into Pennsylvania, New Jersey 

 and Delaware. Within a few years it had extended into New York 

 and Maryland and gradually spread north, south and west. It is 



