Graduate Thesis Or Dissertation
 

Population dynamics of the Douglas-fir cone moth, Barbara colfaciana (Kft.) (Lepidoptera:Olethreutidae)

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  • A population of the Douglas-fir cone moth, Barbara colfaxiana (Kft. ), was studied on the Buckhead Seed Production Area, Oakridge, Oregon, during 1971 and 1972. A method of estimating cone and insect populations is presented. Factors contributing to the mortality of B. colfaxiana are discussed, with resinosis being the critical factor. Larval food consumption is discussed with reference to calories of cone tissue consumed through time. An average of 761 calories are consumed through the four larval stages. Amounts consumed of each structure (bracts, scales, seeds) are presented. A structural model is presented that depicts the role of B. colfaxiana in a natural stand.
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