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The aim was to identify biological and physical factors responsible for reducing maize yield in Cameroon. Two surveys were conducted in 137 fields in two agroecological zones in 1995–1997. In the Humid Forest (HF), Bipolaris maydis, Stenocarpella macrospora, Puccinia polysora, Rhizoctonia solani ...


Ngoko, Z.Cardwell, K.Marasas, W.F.O.Wingfield, M.Ndemah, R.Schulthess, F.[Biological and physical contraints on maize production in the Humid Forest and Western Highlands of Cameroon]Biological and physical contraints on maize production in the Humid Forest and Western Highlands of Cameroon

Sesamia calamistis Hampson and Eldana saccharina Walker larvae were reared at 25°C on pieces of stem from five indigenous African grasses. All five, Andropogon sp., Panicum maximum Jacq., Pennisetum polystachion (L.) Schult., P. purpureum L. and Sorghum arundinaceum (Desv.) Stapf. have been repor...


Shanower, T.G.Schulthess, F.Bosque Pérez, N.A.[The effect of laval diet on the growth and development of Sesamia calamistis Hampson (Lepidoptera: Noctuidae) and Eldana saccharina Walker (Lepidoptera: PYralidae)]The effect of laval diet on the growth and development of Sesamia calamistis Hampson (Lepidoptera: Noctuidae) and Eldana saccharina Walker (Lepidoptera: PYralidae)

common lepidopterous borers attacking maize and/or the wild host Penni.l'etum purpureum in the forest zonc of Camcroon arc the noctuids Buss('ola.li/sca (Fuller), Sesamia calamistis (Hampson) and Poeol1oma serrata (Hampson), the pyralids Eldani! s{{cc/wrin{{ (Walker) and Mus.l'idia nigrivel1ella ...


Ndemah, R.Poehling, H.Borgemeister, C.Schulthess, F.[Spatial dynamics of lepidopterous pests on Zea mays (Linnaeus) and Pennisetum purpureum (Moench) in the forest zone of Cameroon and their implications for sampling schemes]Spatial dynamics of lepidopterous pests on Zea mays (Linnaeus) and Pennisetum purpureum (Moench) in the forest zone of Cameroon and their implications for sampling schemes

Three gregarious, endoparasitic braconids, a Kenyan strain of Cotesia sesamiae, and the exotic Cotesia flavipes and Cotesia chilonis were imported into Benin as candidates for biological control of stem- and cob borers of maize and stemborers of millet. Host acceptability and host suitability of ...


Hailemichael, Y.Schulthess, F.Smith, Jimmy W.Overholt, W.A.[Physiological suitability of six West African gramineous borers (Lepidoptera: Noctuidae, Pyralidae) for development of Cotesia species complex (Hymenoptera: Braconidae)]Physiological suitability of six West African gramineous borers (Lepidoptera: Noctuidae, Pyralidae) for development of Cotesia species complex (Hymenoptera: Braconidae)

The importance, geographical and temporal distributions of parasitoids of lepidopterous borers on maize and elephant grass, Pennisetum purpureum, were assessed during surveys in farmers’ fields in six villages and two on-station trials in the forest zone of Cameroon between 1995 and 1996. The bor...


Ndemah, R.Schulthess, F.Poehling, M.Borgemeister, C.Goergen, Georg E.[Natural enemies of lepidopterous borers on maize and elephant grass in the forest zone of Cameroon]Natural enemies of lepidopterous borers on maize and elephant grass in the forest zone of Cameroon

A review of the existing basis for maize stem borer IPM is given and the role of pathogens in the system is evaluated. Survey work outlining the major groups of insect pathogens is described; fungi (Beauveria bassiana and Metarhizium anisopliae), bacteria (Bacillus thuringiensis and Serratia marc...


Cherry, A.J.Lomer, C.J.Djegui, D.A.Schulthess, F.[Pathogen incidence and their potential as microbial control agents in IPM of maize stem borers in West Africa]Pathogen incidence and their potential as microbial control agents in IPM of maize stem borers in West Africa

Life table studies of Mussidia nigrivenella Ragonot, a pest of maize in Benin, showed that host plant species had a significant effect on larval survival and developmental time. The maximum percentage of larvae surviving was recorded on jackbean, Canavalia ensiformis (36%) and lowest on maize (18...


Sétamou, M.Schulthess, F.Bosque Pérez, N.A.Poehling, H.M.Borgemeister, C.[Bionomics of Mussidia nigrivenella (Lepidoptera: Pyralidae) on three host plants]Bionomics of Mussidia nigrivenella (Lepidoptera: Pyralidae) on three host plants

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

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)

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