Browsing Research Output by Author "11234970 - Du Plessis, Magdalena Johanna"
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Biology and performance of two indigenous larval parasitoids on Tuta absoluta (Lepidoptera: Gelechiidae) in Sudan
Idriss, G.E.A.; Du Plessis, H.; Mohamed, S.A.; Khamis, F.; Ekesi, S. (Taylor & Francis, 2018)Tuta absoluta is an alien invasive pest in Sudan. Since it was detected in the country, the pest continues to cause major tomato losses. Alarmed by its devastating nature and the speed of spread, tomato growers resorted ... -
The charismatic praying mantid: a gateway for insect conservation
Greyvenstein, Bianca; Du Plessis, Hannalene; Van den Berg, Johnnie (Taylor & Francis, 2020)Praying mantids (Mantodea) are not only apex predators with a ‘mystical’ status, but are also regarded as a kind of oracle and, in some cultures, as omens associated with good or bad. In the future, the cultural, mystical ... -
Chemical additives enhance the activity of a Bt‐based biopesticide targeting the beet webworm larvae
Opisa, Selpha; Du Plessis, Hannalene; Akutse, Komivi Senyo; Fiaboe, Komi Kouma Mokpokpo; Ekesi, Sunday (Wiley, 2020)Spoladea recurvalis (Fbr.) (Lepidoptera: Crambidae) larvae can cause up to 100% foliage loss on amaranths during severe outbreaks. The Bacillus thuringiensis Subsp. kurstaki product Halt® is a biologically safe biopesticide ... -
Distribution of Galepsus spp. in Southern Africa and life history of Galepsus lenticularis (Mantodea: Tarachodidae)
Greyvenstein, Bianca; Du Plessis, Hannalene; Van den Berg, Johnnie; Moulin, Nicolas (MDPI, 2020)Galepsus Stäl is a genus within the Mantodea and has hardly been studied in Africa. The distribution of the Galepsus genus in Southern Africa was established, based on insect collection records, and the biology of Galepsus ... -
Diversity of fall armyworm, Spodoptera frugiperda and their gut bacterial community in Kenya
Gichuhi, Joseph; Van den Berg, Johnnie; Du Plessis, Hannalene; Sevgan, Subramanian; Khamis, Fathiya (PeerJ, 2020)Background The invasive fall armyworm, Spodoptera frugiperda (J.E. Smith) is a polyphagous pest that causes widespread damage particularly to maize and sorghum in Africa. The microbiome associated with S. frugiperda could ... -
The effect of different host plants on development and survival of Nysius natalensis (Hemiptera: Orsillidae)
Du Plessis, Hannalene; Van den Berg, Johnnie; Byrne, Marcus (Oxford University Press, 2015)Nysius natalensis Evans (Hemiptera: Orsillidae) is a pest of sunflower in South Africa. Adults invade sunflower fields from their weedy hosts. The host plant suitability for development and survival and the effect of ... -
The effect of different host plants on the reproduction and longevity of Nysius natalensis
Byrne, M.J.; Du Plessis, Magdalena Johanna; Van den Berg, Johann (Wiley-Blackwell, 2012)Nysius natalensis Evans (Hemiptera: Orsillidae) is a pest of sunflower in South Africa. Adults invade sunflower fields from their weedy hosts which occur inside crop fields and on surrounding headlands. The host plant ... -
The effect of temperature on the development and reproduction of Busseola fusca (Lepidoptera: Noctuidae)
Glatz, J.; Du Plessis, H.; Van den Berg, J. (Cambridge Univ Press, 2017)The effect of temperature on the reproduction and development of Busseola fusca was studied under laboratory conditions. Single male–female pairs were confined to oviposition chambers kept at 15, 20, 26 and 30 ± 1°C and a ... -
Effects of Entomopathogenic fungi and Bacillus thuringiensis‐based biopesticides on Spoladea recurvalis (Lepidoptera: Crambidae)
Opisa, S.; Du Plessis, H.; Akutse, K.S.; Fiaboe, K.K.M.; Ekesi, S. (Wiley, 2018)Spoladea recurvalis (Fabricius) is one of the most devastating pests of amaranths caus- ing severe yield losses of 60%–100% to the crop. Unfortunately use of chemical pes- ticides is the most common control strategy that ... -
Efficacy of Bacillus thuringiensis sprays and cotton cultivars expressing cry proteins in the control of Earias biplaga (Walker) (Lepidoptera: Noctuidae)
Fourie, D.; Van den Berg, J.; Du Plessis, H. (BioOne, 2017)Earias biplaga (Walker) (Lepidoptera: Noctuidae) forms part of the bollworm pest complex of cotton in South Africa. Genetically modified Bt cotton that expresses Cry insecticidal proteins successfully controls the bollworm ... -
Efficacy of Bt Maize for control of Spodoptera frugiperda (Lepidoptera: Noctuidae) in South Africa
Botha, A.S.; Du Plessis, Hannalene; Van den Berg, Johnnie; Erasmus, Annemie (Oxford Univ Press, 2019)Spodoptera frugiperda (J.E. Smith) is an invasive pest species that threatens maize production by small holder farmers in Africa. Bt maize that express Cry proteins have been used effectively for control of this pest in ... -
Efficacy of fish- and hydramethylnon-based baits for conservation of the African weaver ant Oecophylla longinoda (Hymenoptera: Formicidae) during cashew off-seasons in Tanzania
Olotu, Moses I.; Du Plessis, Hannalene; Seguni, Zuberi S.; Ekesi, Sunday; Maniania, Nguya K. (Cambridge Univ Press, 2015)The efficacy of fish- and hydramethylnon-based baits for conservation of the African weaver ant (AWA) Oecophylla longinoda Latreille was evaluated at orchards in Bagamoyo and Mkuranga districts, Coast region of Tanzania, ... -
Efficacy of the African weaver ant Oecophylla longinoda (Hymenoptera: Formicidae) in the control of Helopeltis spp. (Hemiptera: Miridae) and Pseudotheraptus wayi (Hemiptera: Coreidae) in cashew crop in Tanzania
Olotu, Moses I.; Du Plessis, Hannalene; Seguni, Zuberi S.; Maniania, Nguya K. (Wiley, 2013)BACKGROUND:Cashew, Anacardiumoccidentale, is aneconomically important cash crop formorethan 300 000 rural households in Tanzania. Its production is, however, severely constrained by infestation by sap-sucking insects such ... -
Evaluation of the susceptibility status of spiny bollworm Earias biplaga (Walker) (Lepidoptera: Noctuidae) to Bt cotton in South Africa
Fourie, D.; Van den Berg, J.; Du Plessis, H. (Entomological Society of Southern Africa, 2017)The bollworm complex of cotton in South Africa consists of the African bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), red bollworm, Diparopsis castanea (Hamps.) (Lepidoptera: Noctuidae), and the spiny ... -
Field and laboratory performance of False codling moth, Thaumatotibia Leucotreta (Lepidoptera: Troticidae) on orange and selected vegetables
Mkiga, Abdullah Mohamed; Du Plessis, Hannalene; Mohamed, Samira Abuelgasim; Khamis, Fathiya Mbarak; Ekesi, Sunday (MDPI, 2019)False codling moth (FCM), Thaumatotibia leucotreta is a key pest of citrus orange and other plants causing fruit loss through larval feeding. Although this pest is native to sub-Saharan Africa little is known on its ... -
Flight activity of the groundnut leafminer (Aproaerema modicella Deventer) (Lepidoptera: Gelechiidae) in the groundnut production areas of South Africa
Du Plessis, H. (Taylor & Francis, 2011)The groundnut leafminer (GLM), Aproaerema modicella (Deventer) is a pest of groundnut and soybean and also attacks lucerne. No information exists on the flight patterns of this invasive species that established in the ... -
Genetic comparisons of fall armyworm populations from 11 countries spanning sub-Saharan Africa provide insights into strain composition and migratory behaviors
Nagoshi, Rodney N.; Du Plessis, Hannalene; Van den Berg, Johnnie; Goergen, Georg; Meagher, Robert (Nature, 2019)The recent discovery of fall armyworm (Spodoptera frugiperda, J.E. Smith) in Africa presents a significant threat to that continent’s food security. The species exhibits several traits in the Western Hemisphere that if ... -
Historic distribution and life history of the African twig mantid, Popa spurca (Mantodea: Deroplatyidae) in southern Africa
Greyvenstein, Bianca; Du Plessis, Hannalene; Van den Berg, Johnnie (Taylor & Francis, 2020)(Stål) (Deroplatyidae) is a well-known species within the African Mantodea. Because this species is often kept as pets, several citizen-based platforms provide information on the rearing of this species. There is however ... -
Horizontal transmission of Metarhizium anisopliae between Spoladea recurvalis (Lepidoptera: Crambidae) adults and compatibility of the fungus with the attractant phenylacetaldehyde
Opisa, Selpha; Du Plessis, Hannalene; Akutse, Komivi S.; Fiaboe, Komi K.M.; Ekesi, Sunday (Elsevier, 2019)The compatibility of the entomopathogenic fungus Metarhizium anisopliae ICIPE 30 which was proved to be pathogenic to adult Spoladea recurvalis, and phenylacetaldehyde (PAA) floral attractant for lepidopteran moths, was ... -
Introgression of a cry1Ab transgene into open pollinated maize and its effect on Cry protein concentration and target pest survival
Erasmus, Reynardt; Pieters, Rialet; Du Plessis, Hannalene; Van den Berg, Johnnie; Hilbeck, Angelika (Public Library of Science, 2019)In Africa, the target pests of genetically modified Bt maize are lepidopteran stem borers, notably Busseola fusca (Lepidoptera: Noctuidae). Gene flow between Bt maize hybrids and open pollinated varieties (OPVs) that do ...