Biology and Life History of Dendroctonus adjunctus (Coleoptera: Scolytidae)

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Abstract
Dendroctonus adjunctus Blandford (D. convexifrons Hopkins), the roundheaded pine beetle, kills groups of pole-size ponderosa pine, Pinus ponderosa Laws., in New Mexico and Arizona. The range of this forest pest extends from southern Utah and Colorado southward through pine forests to Guatemala. Study of a serious outbreak in southern New Mexico showed the insect to have a 1-year life cycle. The attack period lasts 8–9 weeks, peaking in mid-October. The insect overwinters in the egg and egglaying adult stages. Development resumes in late March. The larval stage occurs between April and July, pupation in August. Certain physical and biotic factors appear to play an important part in the sudden rise and fall of outbreaks.

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