356 Report oF THE HorTICULTURIST OF THE 
limbs of a pear tree with cultures of Sphaeropsis obtained from 
cankered apple-tree limbs. The details of the experiment are 
given on page 886. The fungus erew readily at all points of in- 
oculation and though the culture material was inserted between the 
bark and wood it did not attack the cambium layer, but made 
its growth in the outer bark. Here dead sunken areas were pro- 
duced similar to those that are so common on the trunks and 
larger limbs of pear trees. These definitely outlined and sunken 
areas of dead bark commonly known as body blight, have long 
been thought to be due to the action of the pear blight bacillus; 
however, there seems to be no definite reason for such belief. 
But little attention was given the matter at the time since it was 
not then known that Sphaeropsis occurred on these blighted areas. 
In the spring of the present year, however, a Sphaeropsis was 
found to be comparatively abundant on the diseased bark of pear 
trees in the Station orchards. Since that time a large number of 
pear trees from many localities affected with body blight have 
been examined and in nearly every instance a Sphaeropsis was 
present though not in sufficient quantity to account for many of 
the blighted areas. Macrophoma malorum (Berk.) Berl. et Vogl. 
is commonly present in large quantities on the dead bark and 
since Sphaeropsis is able to produce body blight may not this 
closely related fungus be an important factor in producing the 
diseased condition ? 
Fifty successful inoculations made this spring with cultures of 
Sphaeropsis in mature pear trees confirm last year’s results. An 
attempt was also made to grow the Macrophoma artificially, but it 
made an indifferent growth on all of the media that were tried 
and produced no fruit, consequently inoculation experiments with 
this fungus could not be undertaken at that time. 
THE PACIFIC COAST APPLE-TREE CANKER. 
After the publication of the paper, An Apple Canker, the writer 
received inquiries concerning the canker from the secretaries of 
