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plants of the one genus-Rubus, but has been observed on 
nearly every species of the genus. It works on wild as 
well as on cultivated plants, and appears to prefer some 
species to others. As between the dewberry and the black- 
berry it works most upon the dewberry: and between the 
black and red raspberries the blacks are more susceptible 
to attack. The disease also shows choice of varieties: 
thus the Kittatinny and the Erie blackberries seem much 
more susceptible to attack than do Snyder and Wilson. 
The presence of the disease can be detected quite 
early in the spring in the tufted slender shoots which are 
produced, and in the glandular appearance given to some 
of the new leaves by an early and little understood spore 
form which the fungus produces. Later, about the first of 
June the A^cidium or cluster cup spore formation may be 
looked for. The cluster cups first appear as small raised 
spots coveringthe under surface of the leaves: soon the skin is 
ruptured, the cups containing the spore masses protrude, 
and then we have that characteristic appearance which sug- 
gested the name orange rust. 
This, the fruiting stage of the fungus is conspicuous, 
and cannot fail to attract attention, but it is not all there is 
to the plant. 
The vegetative portion consisting of very minute threads 
which ramify through the plant, and which must develope 
before spore formation can take place is not apparent to 
the naked eye: it gives no sign of its presence except by 
inducing the tufted growth of slender shoots. 
It will readily be seen that this vegetative portion of 
the fungus is beyond the reach of any curative applications 
that might be made. It is secure within the tissues of the 
plant, and since it has been proved that the threads extend 
into the roots and are perennial, we are led to the conclusion 
that our only course is to completely destroy the infested plants 
Spraying has been recommended as a protection against 
the spreading of the fungus by the spores, but spraying will 
be unnecessary if the plants are carefully watched and the in- 
fested ones removed before the dissemination of spores 
begins. 
ANTHRACNOSE OF THE RASPBERRY AND BLACKBERRY. 
In 1896 canes of black-cap raspberry infested with this 
disease were sent us from near Denver, b'rom the fact 
that nothing has been heard of the presence of the disease 
since, we regard this as an isolated case introduced, in all 
probability, on plants from some eastern nursery, d'he 
