U. S. D. A., B. E. Bul. 80, Part V. D. F. I. I., September 20, 1910. 
PAPERS ON DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
ON THE NUT-FEEDING HABITS OF THE CODLING MOTH. 
By S. W. Foster, 
Engaged in Deciduous Fruit Insect Investigations. 
INTRODUCTION. 
The codling moth (Carpocapsa pomonella lL.) has, up to the 
present time, been considered as a serious enemy only to pome fruits. 
It has, however, frequently been found in peaches and plums. There 
are several European records of walnut infestation by this species, 
but these reports were carefully sifted by Dr. L. O. Howard in 1887 ¢ 
and found to lack sufficient evidence to definitely prove that the 
codling moth ever feeds either upon nuts or oak galls. C. B. Simp- 
son? records that Adkin, in 1895 and in 1896, exhibited specimens 
and gave details as to the rearing of this insect from chestnuts. In 
March, 1908, at Siloam Springs, Ark., the writer found a full-grown 
larva of this species with partially made cocoon inside a hickory 
nut, but as there were no signs of feeding on the kernel it is probable 
that the larva had gone in only for the purpose of hibernation and 
as a safe place for pupating. 
NOTICE OF WALNUT INFESTATION. 
On October 2, 1909, while visiting the ranch of Mr. George Whit- 
man, near Concord, Cal., the owner mentioned to the writer that 
worms closely resembling the larvee of the codling moth were doing 
serious injury to the walnuts on one of his trees. A large tree near 
a pear-packing shed was closely examined and found to have over 
50 per cent of the nuts infested by larvee of the codling moth. Larvze 
in all stages from a few days old to full grown were found. Egg- 
shells also were found on the outside of the hull of the nuts and on 
the leaves, indicating that the eggs had been placed by the moth on 
fruit and foliage promiscuously, as is customary in the case of apple 
and pear. 
* Rept. Commissioner of Agriculture for 1887, pp. 92-94, 1888. 
> Bul. 41, Bur. Ent., U. S. Dept. Agr., p. 19, 1903. 
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