REPORT OF TIE ENTOMOLOGIST. 105 
**(5) All the trees were thoroughly sprayed seven and eight times 
between June 9 and September 3. . 
**(6) The fallen apples wefte gathered six times from July 16 
onward, and those remaining were picked as they ripened. 
**(7) All the apples, both failen and ripened, 16,529 in number, 
were examined individually for insect injuries, and those due to the 
Codling Moth and Curculios were separately noted. 
(8) As a result of the examination of 2,418 apples from trees 
_ which had been sprayed with Paris green, and of 2,964 others from 
check trees which had not been so treated, it appeared at the end of 
the season that 21 per cent. of the poisoned apples had been infested 
by the Codling Moth and 67.8 of those not so treated; while 27.3 per 
cent. of the poisoned lot had been infested by the Curculios and 51.3 
per cent. of those not sprayed? That is to say, treatment with Paris 
green had saved something more than two-thirds of the apples 
which would otherwise have been damaged by the Codling Moth, 
and something more than half of those which would have been 
sacrificed to the Curculio. It should be remembered in this connec- 
tion that the Paris green not only serves to protect the apples from 
attack, but by actually destroying the insects must assist to lessen 
the amount of insect injury in succeeding years. Analysis of apples 
one week after treatment with Paris green, a heavy storm interven- 
ing, gave abundant evidence that this insecticide could not be safely 
applied for some weeks preceding the harvesting of the fruit. 
**(9) As a result of the comparison of 1,205 apples from a single 
tree sprayed with London purple, and 2,036 apples from a check tree 
not so treated, it appeared that 49 per cent. of the former were af- 
fected by the Codling Moth and 48.8 of the latter, and also that 39 
per cent. of the first lot of apples had been invaded by Curculios and 
48 per cent. of the second lot. The London purple thus saved about 
one-sixth of the apples which would otherwise have been sacrificed 
to the Codling Moth and about one-fifth of those otherwise to be 
spoiled by the Curculios. 
*‘In comparing these results with those derived from the Paris- 
green experiment it must be remembered, however, that the spraying 
with London purple began four days later than that with Paris green, 
and that the latter, as used, contained about one-third more arsenic 
than theformer. Itshould be further noted that both were applied to 
the limit of considerable damage to the foliage conspicuous as early 
as the last of July.* 
“ * * * * * * 
*(l1) As bands or traps serve only to capture the apple worm after 
it has done its mischief, and hence only interpose a general protec- 
tion against future attack, and are moreover liable to be rendered 
ineffectual by neglect of one’s neighbors, the use of Paris green will 
serve at least_as a valuable addition to remedial measures against 
the Codling Moth. Since it may be safely applied, however, only 
* Elsewhere (p. 37) in the same article, however, Professor Forbes says: ‘‘ Late in 
the season some scorching of the leaves similar to that attributed to the Paris green 
was noticed on this London-purple tree; less serious, however, than in the other 
ease.” in addition to this modification of the statement, we may call attention to 
the fact that there was a considerable reduction in the time elapsing between the 
first and second applications of the purple, as compared with the first and second 
applications of the green, and this will have considerable weight in accounting for 
the scorching by what Cook recommends asa safe mixture.—L. O. H. 
