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Attractiveness of eggs and females of Spodoptera littoralis (BSD.) and Helicoverpa armigera (HB.) (Lep. Noctuidae) for Trichogrammatoidea lutea (G.) and Trichogramma rhenana VOEGELE & RUSSO (Hym.; Trichogrammatidae)



Attractiveness of eggs and females of Spodoptera littoralis (BSD.) and Helicoverpa armigera (HB.) (Lep. Noctuidae) for Trichogrammatoidea lutea (G.) and Trichogramma rhenana VOEGELE & RUSSO (Hym.; Trichogrammatidae)



Actes de l' Institut Agronomique et Veterinaire Hassan II 4(1 (Numero Special Zoologie)): 137-141



The attractiveness of the eggs and females of 2 noctuid species very injurious in Morocco, Helicoverpa armigera and Spodoptera littoralis, to trichogrammatid parasites, and the searching ability of these parasites, were investigated in the laboratory in Morocco with strains of Trichogramma rhenana originating from H. armigera in Portugal and Trichogrammatoidea lutea originating from H. armigera in South Africa, which had both been reared for several generations on the substitute pyralid host Anagasta kuehniella in the laboratory in France. Studies with an olfactometer showed that the 2 parasites did not move about very much but were better able to search for H. armigera, of which the females and especially the eggs were more attractive to them than were those of S. littoralis. It is suggested that the trichogrammatids may be instinctively more attracted to their original hosts, despite the generations developed on the substitute laboratory host, and that they may be further discouraged from ovipositing in the eggs of S. littoralis by the scales (from the parent female) with which the eggs of this species are covered.

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