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REPORT OF THE ENTOMOLOGIST. 109 
What with the general experience among practical apple-growers 
who had used them, and Prof. Cook’s experiments, Prof. Riley had 
come to accept the safety and general efficacy of the arsenites, prop- 
erly used, as preventive of apple worm attack, and, in fact, had in 
consequence suggested their probable value, properly used, as against 
Curculio attack, in his address before the American Horticultural 
Society at New Orleans in 1885. With a view of testing this point 
and of settling some others raised by Forbes’ work, Professor Riley 
had planned an extensive series of experiments to be made, during 
the season of 1887, and he instructed our Chio agent, Mr. Alwood, 
who was advantageously located on the grounds of the Ohio Experi- 
ment Station, at the beginning of the season to work in this direction. 
Unfortunately, however, the season proved unpropitious, nearly all 
the apples in the neighborhood “ blighting” after setting, although 
they set very full, and Mr. Alwood was called away in early July to 
take part in another and more pressing investigation. We quote 
from Mr. Alwood’s notes such passages as bear upon the experi- 
ments made: 
‘*On May 17, when first spraying was done, the bloom had fallen 
and an abundance of fruit was set on the young trees. However, 
within a few days fully 75 per cent. of this blighted, except in a few 
instances. These instances were trees sprayed, and as the observa- 
tions given will show, there was scarcely frwit enough in the orchard, 
outside of trees treated, to furnish material to compare with treated 
trees. 
“‘The orchard is composed of about 130 trees just coming into 
bearing. ‘Twelve of the best trees were selected for the work, think- 
ing there was abundant material around them for comparison. Six 
were sprayed with London purple and six with Paris green, at the 
rate of 1 pound of poison to 50 gallonsof water. They were sprayed 
twice—May 17and June 13. At first spraying Curculios were already 
at work, and it did not seem that spraying stopped them. The Cod- 
ling Moth had not yet been noticed, and their larve did not put in 
appearance until after June 1. 
“On June 21 the fallen fruit was collected and examined for larve. 
At this date trees untreated were aimost barren of fruit, it having 
fallen before attaining any size or larve were hatched. 
{ Curculio larvee, 213 apples. 
{ Codling Moth larvee, 13 apples. 
§ Curculio larvee, 267 apples. 
) Codling Moth larvee, 9 apples. 
{ Curculio larvee, 96 apples. 
{ Codling Moth larvee, 42 apples. 
‘The small amount of fallen fruit has already been explained. Be- 
fore the close of season there was scarcely an apple on unsprayed 
trees, while some of those treated ripened several bushels. (They 
were all small trees.) 
**Second counting was made June 28. 
‘*Fallen fruit, Paris green..... 
‘* Fallen fruit, London purple. . 
“Fallen fruit, untreated ...... 
«< Shik 3 Re ee { Curculio larvee. 98 apples. 
Fallen fruit, Paris gr SOs va. 3 y Codling Moth Palace nO apples 
§ Curculio larvee, 87 apples. 
* | Codling Moth larvee, 9 apples. 
{ Curculio larvee, 4 apples. 
* ( Codling Moth larves, 18 apples. 
“At this date both species were about full grown and some were 
leaving the fruit. 
‘* Fallen fruit, London purple. 
7 
“Fallen fruit, untreated trees 
