72 EXPERIMENT STATION. [Jan. 



particularly that of the elm, was caused bv squirrels, and some 

 was due to a natural shedding of the twigs. DothideUa ulmi, 

 a leaf-spot fungus occasionally found on elms, was unusually 

 abundant rather early in the season, and this was also re- 

 sponsible for much loss of foliage. 



The Italian poplar Avas more severely affected with the rust 

 {Melampsora) than usual, and the twigs and leaves of the ash 

 suffered from a similar fungus to an unusmd extent. Horse- 

 chestnut foliage was badly affected with a leaf spot {PhyJlo- 

 sticta), and a black spot {Bhytisjua) more or less common 

 every year on the white maple was unusually a])undant. It was 

 more common on the white maple than usual, and the leaves 

 of the red maple were literally covered with it. 



Ivy (Ampelnpsis) was affected with a leaf s])ot. In some 

 localities quite a few maple trees were killed by sun scald, while 

 others were scalded only on their southern exposure. Following 

 this outbreak of sun scald, Nectria, a fungus of saprophytic 

 habit, developed freely. 



