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Roger B. Ryan

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Recent (1977-1980) releases of imported larch casebearer parasites for biological control

by Roger B. Ryan First published in 1981 — 3 editions
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Initial releases of Chrysocharis laricinellae and Dicladocerus westwoodii for biological control of the larch casebearer in the Western United States

by Roger B. Ryan First published in 1973 — 2 editions

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Illustrated key to introduced and common native parasites of larch casebearer

by Roger B. Ryan First published in 1979 — 1 edition
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Attainment of the overwintering instar and the casebearing habit by larch casebearer larvae at different elevations in the Blue Mountains

by Roger B. Ryan First published in 1974 — 1 edition

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biological and developmental study of Coeloides brunneri Vier.: a parasite of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk.

by Roger B. Ryan First published in 1961 — 1 edition

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Some environmental factors affecting development and emergence of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (Coleoptera: Scolytidae), in the laboratory

by Roger B. Ryan First published in 1959 — 1 edition

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Laboratory reactivation of diapausing larch casebearer larvae following different lengths of winter exposure

by Roger B. Ryan First published in 1974 — 1 edition

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OLID: OL4300604A

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