I 2 
The Colorado Experiment Station 
produce vigorous fruiting canes. There is no question but that 
some of the plantations in Northern Colorado are suffering from 
old age and should be plowed up and consigned to the brush pile. 
This factor alone, in many cases, will account for decreased yields. 
In place of re-setting the land to berries at once, it would be 
much better to plant it to some hoed crop for a year or two, in order 
to get the old raspberry rows thoroughly broken up. At the end of 
this period, the land may be seeded to alfalfa or sweet clover, in 
which case the alfalfa should be plowed under in the fall of the 
second or third year, and the sweet clover at the end of the second 
year. In place of cutting the last crop for hay, this should be turned 
under and used as a green manure, in which capacity it will yield a 
much greater return than if harvested for hay. This done, the land 
mav be again set to raspberries. 
INJURY CAUSED BY SPHABRBLLA RUB IN A. 
Description of the Disease. 
The first indications of the injury here referred to make their 
appearance about the middle of July. If the young, green canes are 
examined carefully, chocolate brown discolorations of the epidermis 
will be found occurring on the lower portion of the cane in the 
region of the point of attachment of the leaves, the node; again, 
small spots may occur between the nodes, the internode, and on the 
petioles of the leaves. The petiole infection is shown at i, and the 
node infection at 2 in the colored plate which was prepared from 
material collected August 9, 1913. The whole area surrounding 
the growing buds at the base of the leaves soon becomes involved 
and turns brown; the buds appear to stop their development, shrivel 
and drp up. If the developing bud is not killed outright during the 
fall and winter, it is so weakened that the following spring it is able 
to send forth only a small, weakly spur which may come into leaf, 
but rarely reaches the blossom stage. The leaves on such spurs are 
usually small, yellow, and apparently poorly nourished. They strug¬ 
gle along for a few weeks, and usually die of starvation. The re¬ 
sult of this condition is a cane with practically no fruit-spurs for a 
distance of 20 to 24 inches above the ground, and with only the up¬ 
per half producing berries. (See Fig. 10.) There certainly is little 
ground for argument that a patch in this condition is producing all 
that it might and is a paying investment. 
In the case of the petiole infection, the nourishment seems to 
be interfered with so seriously that the stem soon collapses and the 
whole leaf droops and ultimately dies, leaving nothing but the dry 
stem remaining. (See Fig. 3 colored plate.) 
