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All Journal Budapest International Research in Exact Sciences (BirEx Journal)
Nicole, Ravelomanantsoa Ramanambe
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Physics Transportation

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Integration of Fruit and Vegetables in the Food of Oreochromis Niloticus in the Vakinankaratra Region Rindra, Rabarison; Nicole, Ravelomanantsoa Ramanambe; Tahina, Rabeharitsara Andry; Pierre, Rakotomamonjy; Ngbolua, Koto-te- Nyiwa; Baholy, Robijaona Rahelivololoniaina
Budapest International Research in Exact Sciences (BirEx) Journal Vol 6, No 3 (2024): Budapest International Research in Exact Sciences, July
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v6i3.7973

Abstract

In order to promote the nutrition of tilapia in farming, a food has been created from traditional raw materials and containing a quantity of banana flour and carrot flour from local production 3%. We tested the food which contains 33% crude proteins and 8% lipids on carp fry having an initial weight of 99.56 ±1.12 gr during 50 days in Vakinankaratra region, Madagascar . After 50 days of experiment, the final weights of the fish fluctuated between 187.63g and 188.15g depending on the treatments used. The food containing banana flour, carrot and the control food showed almost similar growth and food transformation rates, with specific growth rates (SGR) of 3.12%/d and 3.14%/ j as well as a conversion rate of 1.5 and 1.5. Thanks to this test, we were able to observe the impact of banana and carrot on the development of tilapia. We will continue to study the use of local agri-food by-products and waste in feeding this fish.
Vetiver Root Extract as a Biopesticide Against Callosobruchus maculatus F., insect destructive of cowpea seeds (Vigna unguiculata L. Walp.) in stock Dyno, Nambavelo; Sambany, Manjovelo Christian; Nicole, Ravelomanantsoa Ramanambe; Koto-Te-Nyiwa, Ngbolua Jean Paul; Baholy, Robijaona Rahelivololoniaina
Budapest International Research in Exact Sciences (BirEx) Journal Vol 7, No 4 (2025): Budapest International Research in Exact Sciences, October
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v7i4.8129

Abstract

This investigation rigorously assessed the bioinsecticidal potential of methanolic root and leaf extracts derived from Vetiveria zizanioides sourced from three distinct Malagasy chemotypes (Sambava, Fianarantsoa, and Tsiroamandidy). The primary goal was to validate a sustainable, botanical alternative for preserving stored cowpea (Vigna unguiculata) against the destructive pest, Callosobruchus maculatus. The vetiver root extracts demonstrated potent, dose-dependent efficacy across all bioassays. Specifically, at concentrations of 60 μl/l of air or higher, the extracts induced complete adult mortality within 72 hours via contact, and nearly total mortality within 48 hours via fumigation. The Tsiroamandidy chemotype proved particularly efficacious, achieving total mortality by the second day at the maximum dose. Critically, the extracts exhibited profound ovicidal activity, resulting in zero egg hatchability even at the minimum concentration of 10 μl/l, completely suppressing reproduction. This decisive biological action translated into significant commodity protection: seed weight loss, which was 25% in untreated controls, was virtually eliminated at the 60 μl/l threshold, consequently preserving seed quality and germination viability. In sharp contrast, the leaf extracts showed severely limited efficacy, achieving a maximum mortality of only 40% even at the highest tested dose. These findings conclusively validate the vetiver root extract as a highly promising, natural biopesticide for the sustainable management of C. maculatus.
Terroir-Driven Efficacy : Harnessing the Chemogeographical Variation in Vetiveria zizanioides Essential Oils for Stage-Specific Management of the Cowpea Weevil (Callosobruchus maculatus F.) Dyno, Nambavelo; Sambany, Manjovelo Christian; Nicole, Ravelomanantsoa Ramanambe; Koto-Te-Nyiwa, Ngbolua Jean Paul; Baholy, Robijaona Rahelivololoniaina
Budapest International Research in Exact Sciences (BirEx) Journal Vol 7, No 4 (2025): Budapest International Research in Exact Sciences, October
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v7i4.8125

Abstract

The global reliance on synthetic pesticides for preserving stored cowpea (Vigna unguiculata) seeds is jeopardized by rising insect resistance and food contamination, necessitating urgent exploration of safe, botanical alternatives. This study evaluates the biocidal and repellent potential of essential oils extracted from three geographically distinct Malagasy chemotypes of vetiver (Vetiveria zizanioides) Sambava, Fianarantsoa, and Tsiroamandidy against the devastating stored-product pest, Callosobruchus maculatus F. Chemical profiling revealed distinct compositions, with the Tsiroamandidy essential oil notably enriched in the sesquiterpenoids Khusimol (19.1%) and Zizanoic acid (15.1%). Bioassays demonstrated profound insecticidal effects proportional to concentration (10 to 80μl/l). The oils exhibited rapid fumigant toxicity, with all three chemotypes achieving 100% adult mortality at 60μl/l by 48 hours of exposure. Furthermore, the oils proved to be powerful reproductive inhibitors. Female fertility was completely suppressed at a concentration of 30μl/l, drastically reducing oviposition from the control average of 122 eggs. Most critically, the ovicidal activity was exceptional: the egg hatching rate and subsequent adult emergence (viability) were both completely inhibited (0%) even at the lowest tested dose of 10μl/l (control hatching rate : 82%). Beyond direct lethality, the essential oils demonstrated significant protection through repellency, classifying in the Highly Repellent (Class V) category at concentrations ≥60μl/l. These findings establish regional V. zizanioides essential oils as exceptionally potent, multi-action biopesticides, offering a sustainable and highly effective solution for cowpea preservation. 
Co-Authors Baholy, Robijaona Rahelivololoniaina Dyno, Nambavelo Koto-Te-Nyiwa, Ngbolua Jean Paul Ngbolua, Koto-te- Nyiwa Pierre, Rakotomamonjy Rindra, Rabarison Sambany, Manjovelo Christian Tahina, Rabeharitsara Andry