Abstract
The jack-pine budworm, Choristoneura pinus Freeman, was observed feeding in an apparently normal manner on eastern larch. Observations in 1956 and 1957 indicated that large populations of the jack-pine budworm occurred on staminate-cone-producing red pine. The budworm defoliation caused top killing on red pine in all positions of the stand and it was shown that the dead portion of the crown was correlated with the length that was 80% or more defoliated. It was shown also that there was a correlation between the 1957 defoliation and the 1958 terminal growth on understory red pine. The 1957 terminal growth was not correlated with the 1957 defoliation.
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