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SUSCEPTIBILITY OF FIRST-INSTAR CABBAGE MAGGOT, DELIA RADICUM (L.) (ANTHOMYIIDAE: DIPTERA), TO STRAINS OF THE ENTOMOGENOUS NEMATODES STEINERNEMA FELTIAE FILIPJEV, S. BIBIONIS (BOVIEN), HETERORHABDITIS BACTERIOPHORA POINAR, AND H. HELIOTHIDIS (KHAN, BROOKS, AND HIRSCHMANN)1

Published online by Cambridge University Press:  31 May 2012

G.K. Bracken
G.K. Bracken
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

The susceptibility of first-instar cabbage maggot, Delia radicum (L.), to parasitism by seven strains or species of entomogenous nematodes was compared in Petri dishes lined with moist filter paper. The effective doses for 50% mortality (ED50) of the Mexican, Breton, and All strains of Steinernema feltiae Filipjev, of S. bibionis (Bovien), and of Heterorhabditis heliothidis (Khan, Brooks, and Hirschmann) ranged from 98 to 341 infective juveniles per host larva with overlapping 95% confidence intervals; the slopes ranged from 1.36 to 1.07. The DD136 strain of S. feltiae and the species H. bacteriophora Poinar were significantly less lethal with ED50 values of 1113 and 1719 nematodes per host larva, respectively. The addition of a thin disc of rutabaga into the test dishes increased ED50 values by a factor of 20 or more. Application of the Mexican strain of S. feltiae at 5 × 105 nematodes per plant to small caged field plots of rutabaga artificially infested with eggs of D radicum provided control similar to that with diazinon applied at 1.4 L AI per hectare. Practical control of D. radicum on rutabaga with entomogenous nematodes would require strains or species considerably more lethal than those tested here.

Résumé

La susceptibilité des larves du premier stade de la mouche du chou, Delia radicum (L.), au parasitisme par sept variétés ou d’espèces de nematodes entomogènes a été comparée en cuves de Pétri avec du papier filtre humide. Les doses efficaces pour produire une mortalité de 50% (DE50) des variétés Mexican, Breton et AH de Steinernema feltiae Filipjev, de S. bibionis (Bovien) et de Heterorhabditis heliothidis (Khan, Brooks et Hirschmann) se sont étendues de 98 à 341 jeunes infectieuses par larve-hôte avec des intervalles de confiance à 95% chevauchant; les inclinaisons se sont étendues de 1,36 à 1,07. La variété DD136 de S. feltiae et l’espèce H. bacteriophora Poinar ont été significativement moins mortelles avec les DE50’s de 1113 et de 1719 nematodes, respectivement, par larve-hôte. L’adjonction d’un disque mince de navet aux cuves d’essai a augmenté les DE50’s d’un facteur de 20 ou plus. L’applicage de la variété Mexican de S. feltiae à un niveau de 5 × 105 nematodes par plante dans les petits lots encagés de navet, infestés d’oeufs de D. radicum a donné un contrôle semblable à celui obtenu avec la diazinone, arrosée à 1,4 L AI par hectare. Le contrôle pratique de D. radicum sur le navet avec des nematodes entomogènes exigerait des variétés ou des espèces considérablement plus mortelles que celles essayées dans ce travail.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 4 , August 1990 , pp. 633 - 639
Copyright
Copyright © Entomological Society of Canada 1990

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