15 
The moths lay practically all of the eggs of the first generation 
upon the fruit, while those of the later generation are laid both upon 
the fruit and leaves. From many observations the writer is led to 
believe that there is no general rule as regards the eggs of the second 
generation. In some orchards the majority were found upon the fruit, 
and in others upon the leaves. 
In cages the moths rarely live over a week. 
GENERATIONS OF THE INSECT. 
From the economic standpoint the number of generations is an 
important feature, as that is the chief factor in determining the amount 
of damage. In the Eastern States the generations vary from one and 
a partial second to two and a partial third. In California, Oregon, 
New Mexico, and Alabama, various investigators have published the 
statement that three generations occur. Professor Gillette has recently 
come to the conclusion that there are only two generations in Colorado. 
Professor Cordley says that there are only two at Corvallis, Oreg. 
In south Idaho, both Mr. McPherson and Mr. Hitt have advanced the 
idea that there are three full generations, and sometimes a partial 
fourth. 
The writer has regarded this as one of the most essential points to 
be determined in the investigation of this insect. In 1900 an attempt 
was made to solve the problem. At the end of the season, though but 
little data had been secured, the conclusion was reached that there are 
three generations. The writer was not at all satisfied with this con- 
clusion, and in 1901 considerable time was spent in studying this point. 
Examination of the records of worms caught under bands showed 
that at certain periods greater numbers of worms went under bands 
than during the intervals between these times. By collecting and 
studying all available records it was found that these periods were 
quite constant, and this appears to be the best and most accurate way 
of determining the limits and number of generations. 
In June, 1901, circular letters were sent to 60 fruit growers in dif- 
ferent parts of the State of Idaho asking that records be kept of the 
larvae killed under bands. But very few growers failed to answer. 
Among those who responded, a few stated that apples were not grown 
in their sections; others banded and found no larva? or wormy apples; 
and still others could send no record on account of crop failure; but 
a large number sent in valuable records. These records were tabulated 
and curves have been drawn on cross -section paper. a 
«It was the author's intention to include in the present report a number of charts 
showing these curves; but owing to incompleteness of preparation, and other circum- 
stances, these charts have been reserved for publication in a later report. 
L. O. H. 
