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Field control of Heliothis zea (Boddie) (Lepidoptera: Noctuidae) using a parasitic nematode

Published online by Cambridge University Press:  19 September 2011

C. F. J. Bong
C. F. J. Bong
Affiliation:
Department of Plant Protection, University of Agriculture Malaysia, Sarawak Branch, Kuching, Malaysia
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Abstract

Field trials were conducted to assess the effectiveness of a parasitic nematode, the DD136 strain of Neoaplectana carpocapsae Weiser in controlling Heliothis zea (Boddie) on naturally infested sweetcorn.

Nematode suspensions at concentrations of 0, 4 × 103, 4 × 104, 4 × 103 (applied twice) and 4 × 104 (applied twice), nematodes/ml respectively, were sprayed on the ears at early silking stage.

Treatments with 4 × 104 nematodes/ml sprayed twice at 3 days interval gave significantly better control (55%) than the rest. The mean number of surviving H. zea larvae was also significantly reduced with increasing concentrations of nematodes. Economic damage was not prevented but damage to treated ears was significantly lower than that of the untreated plots.

Résumé

Des essais ont été faits pour évaluer l'efficacité d'on nématode parasitaire, du type DD 136 de Neoaplectana carpocapsae Weiser pour maitriser le Heliothis zea (Boddie) sur le mais infesté naturellement.

Les suspensions de nématodes à une concentration de 0; 4 × 103; 4 × 104; 4 × 103 (employé deux fois) et 4 × 104 (employé deux fois) nématodes par millilitre respectivement, ont été vaporisées sur les plants de mais au stade où les épis commencent à developer le panache pendant.

Le traitement, avec 4 × 104, nématodes par millilitre, vaporisé deux fois à trois jours d'intervalle a nettement mieux maitrisé le Heliothis zea (à 55%). En moyenne le nombre de larves d'Heliothis zea ayant survécu a été réduit de façon significative avec l'augmentation des concentrations de nématodes. Les dégats économiques n'ont pas été complitement empêchés, mais les dégats, sur les plants de mais traités on été nettement moindres que pour les plants non traités.

Keywords

ControlHeliothis zea (Boddie)corn earwormsweetcornDD136Neoaplectana carpocapsae Weisernematodeeconomic damageLe maitriséHeliothis zea (Boddie)les larves de maisDD136le maisNeoaplectana carpocapsae Weiserle nématodeles dégats économiques
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 1 , February 1986 , pp. 23 - 25
Copyright
Copyright © ICIPE 1986

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References

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