In the case of _Icerya purchasi_ the possibilities
of success in checking it by its natural enemies hung at one time upon
a question of specific difference between it and the _Icerya sacchari_
of Signoret--a question of minute structure which the descriptions
left unsettled and which could only be settled by the most careful
structural study and the comparison of the types, involving a trip to
Europe.
CONCLUSION.
I have thus touched, gentlemen, upon a few of the many subjects that
crowd upon the mind for consideration on an occasion like this--a few
gleanings from a field which is passing rich in promise and
possibility. It is a field that some of us have cultivated for many
years and yet have only scratched the surface, and if I have ventured
to suggest or admonish, it is with the feeling that my own labors in
this field are ere long about to end and that I may not have another
occasion.
At no time in the history of the world has there, I trow, been
gathered together such a body of devoted and capable workers in
applied entomology. It marks an era in our calling and, looking back
at the progress of the past fifteen years, we may well ponder the
possibilities of the next fifteen.
Pages:
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129