Larval diapause in <i>Dendroctonus obesus</i> (Mannerhaim)(Coloeoptera: Scolytidae)
Keywords:
<i>Dendroctonus obesus</i>, Coloeoptera, ScolytidaeAbstract
i>Dendroctonus obesus</i> (Mannerheim) larvae diapaused in the last instar during laboratory rearing with warm thermoperiods reduced to 12 bours or less, mean temperatures of 50∞-56∞F. (10∞-13.3∞C) and at least one minimum subcortical temperature near or below the larval development threshold during the third and fourth instars. Larvae reared at a constant temperature of 70∞F (21.1∞C) did not diapause. Prediction of beetle populations and forest damage is dependent on a knowledge of the seasonal meteorological conditions that affect larval dispause and subsequently the numbers of mature beetles capable of initiating attacks. Further investigation is required to determine the separate effects of brood age, temperatures and thermoperiods on diapause.References
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