HomeInternational Rice Research Notesvol. 25 no. 3 (2000)

Influence of Rice Varieties on Parasitism of the African Rice Gall Midge (AfRGM)

F. E. Nwilene | M. P. Jones | O. Okhidievbie

Discipline: Agriculture, Pest Science



The African rice gall midge (AfRGM), Orseolia oryzivora Harris & Gagne (Diptera: Cecidomyiidae), is a major constraint to rainfed and irrigated lowland rice production in Africa. The most common natural enemies associated with AfRGM are the polyembryonic endoparasitoid Platygaster diplosisae Risbec (Hymenoptera: Platygasteridae) and the solitary ectoparasitoid Aprostocetus procerae Risbec (Hymenoptera: Eulophidae). These species have potential as biological control agents against AfRGM (Williams et al 1997). The extent to which the activity of these parasitoids may be influenced by rice genotype is not well known. This is a crucial issue because the effects of resistance factor(s) in the rice genotype on the developing midge larvae are likely to be exhibited on the next trophic level of association, i.e., on the AfRGM parasitoids. Such interactions are known to exist in maize, sorghum, and other crops (Potting et al 1995, Nwanze and Nwilene 1998).