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FIELD RELEASES OF TRICHOGRAMMA PRETIOSUM RILEY (HYMENOPTERA: TRICHOGRAMMATIDAE) FOR SUPPRESSION OF CORN EARWORM, HELIOTHIS ZEA (BODDIE) (LEPIDOPTERA: NOCTUIDAE), EGG POPULATIONS ON SWEET CORN IN NOVA SCOTIA

Published online by Cambridge University Press:  31 May 2012

Kenneth A. Neil  and
H.B. Specht
Kenneth A. Neil
Affiliation:
Agriculture Canada, Regional Development Branch, Technology Development Program of the Canada/Nova Scotia AgriFood Development Agreement, 1064 Sesame Street, Kentville, Nova Scotia, Canada B4N 1J4
H.B. Specht
Affiliation:
Agriculture Canada Research Station, Kentville, Nova Scotia, Canada B4N 1J5
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Abstract

Trichogramma pretiosum Riley was released in the field for suppression of corn earworm, Heliothis zea (Boddie), egg populations in Nova Scotia in 1985–1987. Trichogramma pretiosum reduced com earworm populations 7.4–53% compared with chemical treatments reductions of 19–100%. Trichogramma pretiosum were not as effective as insecticides, especially when populations of the corn earworm were low (less than five larvae per 1000 ears). Timing of T. pretiosum releases and spray applications were determined by blacklight trap catches and were considered critical for effective control.

Résumé

Trichogramma pretiosum Riley a été libéré dans un champ pour supprimer des populations d’oeufs du ver d’épis de maïs, Heliothis zea (Boddie), à la Nouvelle Écosse de 1985 à 1987. Trichogramma pretiosum a réduit des populations de vers d’épis de maïs de 7,4 à 53% à comparer à des réductions de 19 à 100% occasionnées par des traitements chimiques. Trichogramma pretiosum n’a pas été aussi efficace que les insecticides, surtout quand les populations du vers d’épis de maïs ont été basses (moins de cinq larves par 1000 épis). La synchronisation des libérations et des traitements par arrosage ont été déterminés par les prises des pièges à lumière noire et ont été considérés critiques pour atteindre une suppression efficace.

Type
Research Article
Information
The Canadian Entomologist , Volume 122 , Issue 6 , December 1990 , pp. 1259 - 1266
Copyright
Copyright © Entomological Society of Canada 1990

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Footnotes

1

Contribution No. 2055 of the Research Station.

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