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infest the top of a tree also--both in the dormant and in the
growing state.  I have oftern seen them in such large numbers
on young trees, as to look as if the tree had been hurt by
frost, or some other cause.  Two years ago I visited a nurseryman,
and in looking over his nursery, he called my attention
to a lot of peach trees, saying that a previous cold
storm had injured them badly.  As soon as I saw the trees, I
explained the cause, and upon examination we found millions
of this aphis which had infested the roots of the previous
year, and in the spring had come up on the tops, and in favorable
weather had increased wonderfully.  It is easy to destroy
them when on the top by tobacco water or dust, but hard to
get at [them] when on the roots.  It infests the small fibre
roots of larger trees also and gradually saps the vitality
of the trees, which turn yellow, and eventually die; and the
so called yellow[s] is often caused by the ravages of this 
little underground robber.

"It is more prevalent in cold backward seasons, and on
sandy soils and it is almost impossible to raise small seedling
trees in the vicinity of old trees, as it prefers the
young roots, and kill the young tree in a single season.
        