I3 2 
Journal of Agricultural Research 
Vol. XXI, No. 3 
longer life for the attacked needles and insures fresh material for the 
larvae to feed upon. By the latter part of October the larvae have grown 
to be approximately 2 mm. long and have mined about one-third the 
outer length of the infested needles. 
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Fig. 3.—Diagram illustrating seasonal activity of Recurvaria milleri and the corresponding phenological 
phenomena of the host plant. 
Owing to the high elevations, above 7,000 feet, of the infested areas, 
winter conditions set in during the latter part of October and insect 
activity ceases until the following spring. During the winter of the 
first season the insect hibernates as immature larvae in the partially 
mined needles. 
