764 NEW YORK STATE MUSEUM 
There is a brief mention of the occurrence of the little black 
ladybug, Pentilia misella Lec., in my previous report, 
but this year it was observed in much larger numbers on infested 
trees in the experimental orchard and also in an infested 
orchard near by. It was much more abundant in the latter, 
probably on account of the much larger number of scale insects, 
since practically nothing had been done to keep the pests in 
check. This beneficial form was not present in sufficient num- 
bers to attract notice till Sep. 25, and from then till the middle 
of October, at least, the beetles were quite numerous; 50 on a 
small badly infested tree would not be an excessive estimate. 
These ladybugs, however, do not seem to have made much im- 
pression as yet on the San José scale; and, though they were . 
much more abundant in the adjacent orchard where no insecti- 
cides of any account had been applied, the scale had not been 
affected enough to warrant a hope that eventually this pest 
may be controlled by this little natural enemy. It certainly 
would not be wise at present to defer treatment with insecti- 
cides on account of the presence of this tiny ladybug. : 
The fruit tree bark beetle, Scolytus rugulosus Ratz., 
also occurs in the experimental orchard, attacking a number of 
trees last year but injuring only one very seriously. This was 
broken down by wind or other agency, and the beetles entered 
the prostrate limbs in large numbers. This year a light oxheart 
cherry (tree 4) was attacked by this beetle and injured consid- 
erably. It was in excellent condition last year, but toward the 
end of the season became rather badly infested with San José 
“seale. July 3 it was found to be infested with Scolytus. 
There was a copious exudation ofi sap or gum and a number of 
edematous swellings were observed here and there. The tree 
was quite badly affected Aug. 9. Several other trees were at- 
tacked to a less extent by this borer. | 
Appearance of oil on trees. This general note applies to all 
trees treated with crude petroleum or mechanical emulsions of | 
the same. May 22, the oil shows very plainly, and all of the 
iN. Y. state ent. 16th rep’t. 1901. p. 970. 
