Injury to young jack pine in an experimental plantation at Cloquet, Minn., by a shoot boring insect, Eucosma sonomana Kearfott, stimulated the investigacions on life history, biology and incidence reported here. Notes on life history, biolop and injury are included for two additional species of the subfamily Eucosminae, family Olethreutidae; namely Petrova albicapitana Busck, and Petrova pallipennis McDunnough.
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Butcher et al. (1949) studied this question.
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