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EFFECT OF CLIMATIC FACTORS ON POST-DIAPAUSE EMERGENCE AND SURVIVAL OF SPRUCE BUDWORM LARVAE (LEPIDOPTERA: TORTRICIDAE)

  • G. S. Lucuik (a1)

Abstract

Earlier attempts to correlate spruce budworm, Choristoneura fumiferana (Clem.), outbreaks and weather conditions were usually carried out by comparing seasonal data and spruce budworm outbreak development in broad terms: it was found that warm, dry weather favored outbreak development, while cool, wet weather retarded development. In this paper, laboratory experiments and historical data are examined to determine the effect of temperature and precipitation on second-instar larvae, just prior to and after spring emergence. Results tend to show that prolonged rain and freezing temperatures during and shortly after emergence are detrimental and may, in some cases, have a profound impact on outbreak development.

Par le passé, les efforts visant à établir des rapports entre les infestations de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clem.), et les conditions météorologiques ont ordinairement consisté à comparer les données saisonnières et le développement des tordeuses en termes généraux. Ainsi, on a observé qu'un temps chaud et sec favorise le développement, tandis qu'un temps froid et humide le retarde. Notre démarche a été d'examiner et de comparer les résultats d'expériences en laboratoire et les données historiques pour déterminer les effets de la température et des précipitations au cours d'une période précise du cycle de la tordeuse, principalement à la période correspondant aux premiers stades larvaires, juste avant et après l'émergence au printemps. Nous avons découvert qu'en général un temps défavorable au moment de l'émergence et peu après nuisait aux jeunes larves et pouvait, dans certains cas, agir comme agent régulateur.

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References

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EFFECT OF CLIMATIC FACTORS ON POST-DIAPAUSE EMERGENCE AND SURVIVAL OF SPRUCE BUDWORM LARVAE (LEPIDOPTERA: TORTRICIDAE)

  • G. S. Lucuik (a1)

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