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Shanower, T.Schulthess, F.Gounou, S.[Distribution and abundance of some stem and cob borers in Benin: Plant Health Management research monograph No. 1]Distribution and abundance of some stem and cob borers in Benin: Plant Health Management research monograph No. 1

This study aimed at an assessment of the potential of the egg parasitoid Telenomus isis (Polaszek) as a biological control agent of cereal stem borers. Therefore, the effects of temperature, host species, host age, and time of host deprivation on the development and the reproductive potential of ...


Chabi-Olaye, A.Schulthess, F.Poehling, H.M.Borgemeister, C.[Factors affecting the biology of Telenomus isis (Polaszek) (Hymenoptera : Scelionidae), an egg parasitoid of cereal stem borers in West Africa]Factors affecting the biology of Telenomus isis (Polaszek) (Hymenoptera : Scelionidae), an egg parasitoid of cereal stem borers in West Africa

The effect of fertilizer and mulch across tropic level of the cassava ecosystem, i.e. the plant, the cassava mealybug(CM), the wasp Apoanagyrus lopezi and its hyperparasitoids, was studied in two field experiments planted ins southern Benin. Several cassava cultivars with different branching patt...


Schulthess, F.Neuenschwander, P.Gounou, S.[Multitrophic interactions in cassava, Manihot esculenta, cropping systems in the subhumid tropics of West Africa]Multitrophic interactions in cassava, Manihot esculenta, cropping systems in the subhumid tropics of West Africa

Geographic distribution, relative importance, and effect of lepidopterous stem and ear borers on maize, Zea mays L., were studied in the humid forest and the mid-altitude zones of Cameroon from 1994 to 1997. Six villages were chosen in the forest zone and grouped into three blocks representing gr...


Ndemah, R.Schulthess, F.Korie, S.Borgemeister, C.Cardwell, K.F.[Distribution, relative importance and effect of lepidopterous borers on maize yields in the forest zone and midaltitude of Cameroon]Distribution, relative importance and effect of lepidopterous borers on maize yields in the forest zone and midaltitude of Cameroon

Eighty and sixty maize fields were sampled in 1994 and 1995, respectively, to monitor Aspergillus infection and aflatoxin contamination of preharvest maize in Benin. Three Aspergillus species were isolated from different agroecological zones, with A. flavus being the most prevalent. The countrywi...


Setamou, M.Cardwell, K.Schulthess, F.Hell, K.[Aspergillus flavus infection and aflatoxin contamination of preharvest maize in the Republic of Benin]Aspergillus flavus infection and aflatoxin contamination of preharvest maize in the Republic of Benin

Difficulties of identification of natural enemies of cereal stemborers for 'redistribution' in Africa are discussed. Tritrophic level studies on wild and cultivated habitats of borers and beneficial species are needed to judge the impact of a natural enemy species in the cropping system. Areas wi...


Schulthess, F.Bosque Pérez, N.A.Chabi-Olaye, A.Gounou, S.Ndemah, R.Goergen, Georg E.[Exchanging natural enemies species of lepidopterous cereal stemborers between African regions]Exchanging natural enemies species of lepidopterous cereal stemborers between African regions

The palaeotropical, gregarious, endoparasitic braconids Cotesia sesamiae, Cotesia flavipes and Cotesia chilonis were recently imported into Benin as candidates for biological control of stem and cob borers of maize. Host acceptability and host suitability of six gramineous borers occurring in wes...


Hailemichael, Y.Schulthess, F.Smith, W.Overholt, W.A.[Suitability of West African gramineous stemborers for the development of Cotesia species (Hymenoptera: Brachonidae)]Suitability of West African gramineous stemborers for the development of Cotesia species (Hymenoptera: Brachonidae)

The spatial dispersion pattern and the intracanopy distribution of the mango mealybug, Rastrococcus invadens Williams, were assessed during one year in a small mango plantation, in order to develop sampling plans and facilitate sampling in mango trees. Mean number of mango mealybugs per leaf diff...


Boavida, C.Neuenschwander, P.Schulthess, F.[Spatial distribution of Rastrococcus invadens Williams (Hom., Pseudococcidae) in mango trees]Spatial distribution of Rastrococcus invadens Williams (Hom., Pseudococcidae) in mango trees
Chabi-Olaye, A.Schulthess, F.Shanower, T.G.Bosque Pérez, N.A.[Factors influencing the bionomics of Telenomus busseolae (Gahan) (Hym.: Scelionidae) an egg parasitoid of Sesamia calamistis Hampson (Lep.: Nactuidae)]Factors influencing the bionomics of Telenomus busseolae (Gahan) (Hym.: Scelionidae) an egg parasitoid of Sesamia calamistis Hampson (Lep.: Nactuidae)

In southern Benin, the use of cover crops to improve and maintain soil fertility is on the increase. The present study investigated the effect of two leguminous cover crops, Canavalia ensiformis (L.) DC and Sesbania rostrata Brem. & Oberm., planted at different dates before maize (Zea mays (L.)),...


Agboka, K.Schulthess, F.Tounou, A.K.Tamò, M.Vidal, S.[The effect of leguminous cover crops and cowpea planted as border rows on maize ear borers with special reference to Mussidia nigrivenella Ragonot (Lepidoptera: Pyralidae)]The effect of leguminous cover crops and cowpea planted as border rows on maize ear borers with special reference to Mussidia nigrivenella Ragonot (Lepidoptera: Pyralidae)

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