THE PRINCIPAL INSECTS LIABLE TO BE DISTRIBUTED ON 
NURSERY STOCK. 
INTRODUCTION. 
In preparing this descriptive catalogue of the insects liable to be 
transported upon nursery stock, it has appeared that there is a great 
disparity of views as to what insects should be included. To include 
only such as are known to be very destructive would exclude a great 
many species that will be found by anyone who examines a tree in the 
fall or early spring. To include all the species that are known to be 
found in any stage upon fruit trees in winter would make the list too 
bullry. Therefore, all species known to be of more than local interest 
have been treated. Notes on the species infesting fruits are added at the 
end. The insects have been arranged according to their natural orders, 
and in the Hemiptera (bugs, scale insects, plant-lice) according to the 
families. In the Coleoptera (beetles, weevils) and Lepidoptera (but- 
terflies and moths), such an arrangement did not seem desirable. No 
account of the remedies to be recommended or used is given, as these 
differ greatly, according to locality and conditions, and the various 
State laws specify certain treatments. 
It will be a great help to those interested in the growth and sale of 
young fruit trees to be able to recognize the appearance of the various 
insect pests during the winter; therefore, much attention has been paid 
to this phase of the subject. 
In using this bulletin one should remember that, besides the insects 
here treated, there may be upon a tree other insects of less importance. 
TABULAR STATEMENT OF INSECTS UPON THE TREE IN WINTER. 
Insects upon the roots: 
Forming swellings on apple roots Woolly aphis. 
On peach and plum roots Black peach aphis. 
Insects upon the bark of trunk or branches: 
Plant-lice or aphids Woolly aphis. 
Small brown clear-winged insect in the crevices of bark Pear psylla. 
Scale insects or bark-lice See Coccidae. 
Caterpillars in cases or cocoons Fall webworm, bud moth, apple 
Bucculatrix, codling moth, pistol-case and cigar-case bearers. 
In nests or bunches of shriveled leaves attached to branches Leaf-crumpler, 
and brown-tail moth. 
