
          113

are but a prelude to the depredations to be expected from it
hereafter.  His theory is also that as a consequence upon
their appearance in such swarms, the yellows will now be apt
to penetrate into Maryland,-- if not as a direct result of the
injuries of the insect, at least on account of the impaired
vitality of the trees, which will invite that disease or unfit
them to resist its appoaches.  These insects during
early spring may be discovered, in as great numbers as at any 
time on the leaves, on the young fibrous roots of the trees,
and these roots are always found sapless and in process of
decay." pp. 331-2.

Yellows at this time, 1874, may have been in Col. Wilkins
orchards. Cf. Ibid. p. 247, where it says that he found
in his orchards varieties which should ripen some weeks apart,
did ripen together; he also found "other unfavorable indications
in his orchards."

Decay of peach trees attributed to the lack of tap root, i.e.
to transplanting. Ibid. p. 212, Rob. Chisholm. See also letter
on same subject from Batl. Co., Md in Letter File.

W. F. Goodwin, New Castle, Del., May 25, 1874:--"We have
the peach louse here and trees attacked are almost entirely
stripped of foliage." --Ibid. p. 213.
        