INSECTS INFESTING FRUIT TREES. 
1. THE APPLE. 
AFFECTING THE ROOT. 
Wart-like excrescences growing upon the roots, sometimes of an enormous size; 
containing in their crevices exceedingly minute lice, often accompanied with 
larger winged ones having their bodies covered with a white cotton-like 
matter. 
The Apple-root Blight, Pemphigus Pyri. Synonyms, Eriosoma Pyri, Fitch, 
Fourth Report of the N. T. State Cabinet of Nat. Hist., A. D. 1851, (Son- 
ate Document, No. 30) p. 68. Pemphigus Americanus > Walker, List 
of Homopterous Insects in the British Museum, 1852, p. 1057. 
Upon the 29th day of October, 1849, I was occupied in setting 
out a number of young Apple trees which had been brought me 
from the nursery at Glens Falls, Warren county, when, on the 
roots of one of these trees, I observed some very singular excrescen¬ 
ces. I was conjecturing as to the cause of this remarkable dis¬ 
ease, which appeared to be sufficient to destroy the tree, when, 
nearly concealed in one of the largest excrescences, a woolly Plant- 
louse was perceived, and on further inspection, a second one was 
found, similarly secreted—one of these being dead, the other alive. 
And on examining the crevices of this excrescence with a magni- 
fying glass, they were discovered to be occupied by numerous 
lice, so minute as to be wholly imperceptible to the naked eye. 
These, there can scarely be a doubt, were the young of the larger 
winged lice, first noticed. 
Upon the wing, in groves, late in the autumn, I have captured 
numerous individuals of this same species, where no apple trees 
were growing within a half mile. These were probably bred 
upon the roots of the Thorn or the Shad-bush ( Avielanchiei- 
