Uscana lariophaga Steffan (Hym.: Trichogrammatidae) , egg parasitoid of the stored insect pests Callosobruchus maculatus (F.) and Bruchidius atrolineatus Pic. (Col.: Bruchidae) : population studies in the field and in storage in Niger

Lammers, P.M.; Huis, A. van

Proceedings Integrated Pest Management in Tropical and Subtropical Cropping Systems 3: 1013-1022


Accession: 002539482

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Observations on Uscana lariophaga were carried out during 1987-88 in cowpea fields and stores in Niger. In the field, 4% of eggs of Callosobruchus maculatus and 23% of eggs of Bruchidius atrolineatus eclosed normally, with 50 and 39%, resp., being parasitized by U. lariophaga. From January to March 1988 only eggs of C. maculatus were present in experimental granaries. Of these eggs, 51% hatched normally and 33% were parasitized. Straw granaries had a lower incidence of eggs of C. maculatus and a lower rate of parasitism than clay granaries. This paper was presented at a conference on 8-15 February 1989 in Bad Durkheim, Germany.