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EFFICACY AND TIMING OF PERMETHRIN MISTBLOWER SPRAYS FOR THE CONTROL OF FIRST-INSTAR LARVAE OF THE SPRUCE BUDMOTH, ZEIRAPHERA CANADENSIS MUT. AND FREE. (LEPIDOPTERA: TORTRICIDAE)

  • B.V. Helson (a1) and M. Auger (a2)

Abstract

Mistblower applications of permethrin at 70 g AI per hectare to individual white spruce trees near the onset of the hatching period reduced spruce budmoth, Zeiraphera canadensis Mut. and Free., larval populations by 90% and damage to leaders to a very acceptable index of 0.49. A dosage of 35 g AI per hectare was less effective but did provide acceptable leader protection (damage index: 0.93). Further mistblower trials, designed to determine the optimum time to spray with permethrin, demonstrated that at 70 g AI per hectare, effective control (87–94%) and acceptable protection (damage indices: 0.87–1.13) were obtained during a 9-day period before the onset of hatch. An earlier treatment. 11 days before hatch, did not provide as effective control (58%) or acceptable protection (damage index: 1.60). Two later treatments, 3 and 4 days after the onset of hatch, gave less effective control (75–79%) but did provide acceptable leader protection (indices: 0.83–1.17).

La vaporisation de perméthrine à raison de 70 g AI par hectare à des épinettes blanches choisies, à peu près au début de la période d’éclosion, a réduit les populations de Tordeuses de l’épinette, Zeiraphera canadensis Mut. et Free., d’environ 90% et diminué les dommages aux bourgeons terminaux jusqu’à un indice très acceptable de 0,49. Une dose de 35 g AI par hectare s’est avérée moins efficace, mais a assuré une protection acceptable des bourgeons terminaux (indice de dommage : 0,93). D’autres tests, élaborés dans le but de déterminer le moment idéal de la vaporisation, ont démontré qu’à 70 g AI par hectare on pouvait obtenir un contrôle efficace (87–94%) et une protection acceptable (indice des dommages : 0,87–1,13) au cours d’une période de 9 jours avant le début de l’éclosion. Un traitement antérieur, 11 jours avant l’éclosion, a donné des résultats inférieurs, un contrôle de 58% et une protection non acceptable des bourgeons terminaux (indice de dommage : 1,60). Deux autres applications 3 à 4 jours après le début de l’éclosion ont été moins efficaces (75–79%), mais ont assuré une protection acceptable des bourgeons terminaux (indices : 0,83–1,17).

[Traduit par la rédaction]

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References

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EFFICACY AND TIMING OF PERMETHRIN MISTBLOWER SPRAYS FOR THE CONTROL OF FIRST-INSTAR LARVAE OF THE SPRUCE BUDMOTH, ZEIRAPHERA CANADENSIS MUT. AND FREE. (LEPIDOPTERA: TORTRICIDAE)

  • B.V. Helson (a1) and M. Auger (a2)

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