New tents spun in five successive springs by the European pine shoot moth (Rhyacionia buoliana [Schiff.] ) in a Michigan planting of red pine (Pinus resinosa Ait.) occurred about 2 days later each year. This trend is believed due to habitat cooling as trees grow larger. In another planting feeding was more advanced on small trees than on large trees.
Miller, William E.
"Annual Variation in Starting Date of Spring Feeding by the European Pine Shoot Moth in a Michigan Planting,"
The Great Lakes Entomologist: Vol. 4
, Article 6.
Available at: http://scholar.valpo.edu/tgle/vol4/iss1/6