COLORADO EXPERIMENT STATION. 
7 
D. B. Wier, a well known writer upon horticultural 
subjects. Mr. Wier says: 
“I looked over an orchard very carefully on May 26th, and could 
find no instance where a larva had penetrated an apple. * * * * 
To-day, May 28th, in the same orchard, a search of an hour rewarded 
me with 20 apples in which the larvae had penetrated the fruit suffi¬ 
ciently to make a showing; they were from an eighth to a twentieth 
of an inch in length, showing that they were only from one to four 
days from the egg. * * * * To-day the apples here at Petaluma 
are well grown, averaging over 1 }4 inches in diameter.” 
The exact time at which the moths begin to 
deposit their eggs, will also vary greatly in different 
years but it is quite safe to say that egg-laying does 
not take place to any considerable extent until the 
flowers have fallen from the late varieties of apple 
trees. The eggs are deposited one in a place in the 
blossom or calyx end of the apples and it has been 
estimated that each moth deposits at least 50 eggs. 
Within a few days after the deposition of the egg, 
the time dependent on the temperature, the larva 
hatches. It feeds for a short time within the calyx 
and then begins to burrow towards the core of the 
fruit within and about which it feeds until fully 
grown when it gnaws an opening, usually at the side 
of the apple, and escapes to go in search of a suit¬ 
able place to spin its cocoon and transform to the 
pupa or chrysalis state. About two weeks later, 
probably about the 5th of July in Colorado, the 
moths of the second brood begin to appear which 
soon begin to lay eggs for a second brood of the 
worms. This brood does far greater harm than the 
first unless the first have been mostly destroyed, in 
which case there are comparatively few moths to 
lay eggs to produce a second brood. 
