Laboratory and Greenhouse Evaluation of Melia volkensii Extracts for Potency against African Sweet Potato Weevil, Cylas puncticollis, and Fall Armyworm, Spodoptera frugiperda

Jaoko, Victor; Taning, Clauvis Nji Tizi; Backx, Simon; Motti, Pierfrancesco; Mulatya, Jackson; Vandenabeele, Jan; Magomere, Titus; Olubayo, Florence; Mangelinckx, Sven; Werbrouck, Stefaan; Smagghe, Guy

doi:10.3390/agronomy11101994

Cited by 10 publications

(10 citation statements)

References 39 publications

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“…Interestingly, push-pull technology (PPT) and botanical insecticides are among potential candidates to be deployed with RNAi in an integrated fashion. Currently, many studies have shown that the application of bioformulations of botanical materials ( Jaoko et al, 2021 ) and the emission of chemical compounds by PPT ( Khan et al, 2018 ; Midega et al, 2018; Mutyambai et al, 2019 ) provide promising results against S. frugiperda across diverse agro-ecologies, particularly in the African context. For instance, botanical extracts from Melia volkensii L, Azadirachta indica Juss, Schinnus mol L and Phytolacca dodecandra L. displayed antifeedant activity with larval mortality of more than 90% ( Sisay et al, 2019 ; Jaoko et al, 2021 ).…”

Section: Methodsmentioning

confidence: 99%

“…Currently, many studies have shown that the application of bioformulations of botanical materials ( Jaoko et al, 2021 ) and the emission of chemical compounds by PPT ( Khan et al, 2018 ; Midega et al, 2018; Mutyambai et al, 2019 ) provide promising results against S. frugiperda across diverse agro-ecologies, particularly in the African context. For instance, botanical extracts from Melia volkensii L, Azadirachta indica Juss, Schinnus mol L and Phytolacca dodecandra L. displayed antifeedant activity with larval mortality of more than 90% ( Sisay et al, 2019 ; Jaoko et al, 2021 ). As a versatile option, PPT improves the aboveground and belowground plant environment to enhance the plant while making it less suitable for S. frugiperda ( Khan et al, 2018 ; Sobhy et al, 2022 ) and possesses a convincing trait to act with RNAi.…”

Section: Methodsmentioning

confidence: 99%

“…As a versatile option, PPT improves the aboveground and belowground plant environment to enhance the plant while making it less suitable for S. frugiperda ( Khan et al, 2018 ; Sobhy et al, 2022 ) and possesses a convincing trait to act with RNAi. In other words, the importance of combining different control strategies is signified to improve the insecticidal activity of bio-options and prevent pest resistance emergence ( Wang et al, 2017 ; Jaoko et al, 2021 ). Surprisingly, RNAi offers an exceptional mode of action among bioinsecticides through the mechanism of gene suppression and therefore can supplement the present methods used for pest control ( Griebler et al, 2008 ; Tabashnik and Carrière, 2017 ; Mehlhorn et al, 2021 ).…”

Section: Methodsmentioning

confidence: 99%

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RNA interference (RNAi) applications to the management of fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae): Its current trends and future prospects

Kebede

Fite

2022

Front. Mol. Biosci.

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The fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae) is among the invasive insect pests that damages maize and sorghum, the high-priority crops in newly colonized agro-ecologies, including African contexts. Owing to the increasing infestation of the pest and the limitations of current conventional methods for its management, there is a call for discovering advanced pest management approaches. RNA interference (RNAi) is an emerging molecular tool showing flexible potential for the management of S. frugiperda. We conducted a search of the recent application of RNAi literature using Google Scholar and Mendeley to find advanced papers on S. frugiperda management using RNAi molecular tools that led to growth inhibition, developmental aberrations, reduced fecundity, and mortality, mainly by disruption of normal biological processes of the pest. Although efforts have been made to accelerate the utility of RNAi, many factors limit the efficiency of RNAi to achieve successful control over S. frugiperda. Owing to RNAi’s potential bioactivity and economic and ecological acceptability, continued research efforts should focus on improving its broad applicability, including field conditions. Screening and identification of key target genes should be a priority task to achieve effective and sustainable management of this insect via RNAi. In addition, a clear understanding of the present status of RNAi utilization in S. frugiperda management is of paramount importance to improve its efficiency. Therefore, in this review, we highlight the biology of S. frugiperda and the RNAi mechanism as a foundation for the molecular management of the pest. Then, we discuss the current knowledge of the RNAi approach in S. frugiperda management and the factors affecting the efficiency of RNAi application. Finally, the prospects for RNAi-based insect pest management are highlighted for future research to achieve effective management of S. frugiperda.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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RNA interference (RNAi) applications to the management of fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae): Its current trends and future prospects

Kebede

Fite

2022

Front. Mol. Biosci.

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“…However, this essential crop is under significant threat from pests like the sweet potato weevil (Cylas puncticollis). Research reveals that these pests cause substantial yield losses, both in the fields and during storage after harvest (Jaoko et al, 2021) [4] . Excessive use of pesticides in response to these issues has raised concerns about the well-being of agricultural workers (Marete et al, 2021) [8] , highlighting the necessity for transitioning to sustainable pest control methods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of pest management strategies among sweet potato farmers: Insights from a study in Homa Bay County, Kenya

Ochieng

2024

Int. J. Hortic. Food Sci.

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This research investigated the pest management strategies among sweet potato farmers in Homa Bay County, Kenya. The study focused on how farmers managed the Sweet potato weevil (Cylas puncticollis.). Using a participatory rural appraisal methodology, the study involved 269 farmers through focus group discussions, transect walks, and pairwise ranking to identify and improve Integrated Pest Management strategies suitable for the specific context. The primary method identified was re-ridging during weeding. This method was used by 26.2% of the farmers in Rachuonyo and 15.3% in Ndhiwa Sub-counties. Re-ridging is a physical adjustment of the soil around the crops to bury the sweet potato weevil eggs and larvae. The main observation was that the use of re-ridging to combat pests was prevalent based on the simplicity and efficiency of the approach to matching the farmer's operational capabilities. It was observed that an average of 64.5% of the farmers in Ndhiwa did not adopt any control measure, highlighting a significant gap in knowledge and resource availability for pest management. Other less prevalent methods included early harvesting and the use of clean planting vines. The study recommends the strengthening of Agricultural Extension Services in the county to bridge the knowledge gap among the invincibly vulnerable farmers. The research identified that some farmers use innovative methods with a possible high potential for positive outcomes to address the pests. However, many farmers remain ignorant or lack access to critical measures due to various constraints. The study, therefore, recommends increased investment in research and engagement with community workers to educate farmers. Additionally, policy intervention is required to ensure effective use and resource availability to all farmers. This would ensure sustainable agricultural practices and promote food security combining the traditional processes with modernity.

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“…They are also used therapeutically to cure pain and aches [5] and antimicrobial activity [4][5][6][7]. Leaf and fruit extracts are used as insect repellants [8,9]. The tree is termite resistant [2,8,10] and produces hard timber, comparable to mahogany [11,12].…”

Section: Introductionmentioning

confidence: 99%

Variation of Morphological Traits and Quality Indices of Micropropagated Melia volkensii Gürke Clones before Field Planting

Dushimimana

Magomere

Mulatya

et al. 2022

Forests

Self Cite

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The quality of acclimatized in vitro cultivated plants is essential to ensure good survival and growth after planting in field conditions. After two months of acclimatization, this study revealed a significant variation in survival rate, shoot characteristics, root traits, and biomass features between 13 clones of Melia volkensii Gürke. A number of quality indices such as the Dickson Quality Index (DQI), shoot dry weight: root dry weight ratio (S:R), and sturdiness quotient (SQ) also showed a large variation. The survival rate was genotype-dependent, with an average of 85%. Extreme genotypes were tall, had long internodes, a lot of leaves, and a large leaf area. At the other side of the spectrum, there were small clones with short internodes and a reduced number of leaves and leaf areas. The high S:R values (>2) of the evaluated clones indicate an imbalance between the shoot and root system, negatively influencing the quality of the in vitro produced M. volkensii plants. The SQ for all clones was below the threshold value of 6, implying a good and expected survival rate. This study illustrates that some clones might systematically score better for SQ, S:R, plant volume, and DQI after acclimatization and that these factors could form the basis for selection.

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Laboratory and Greenhouse Evaluation of Melia volkensii Extracts for Potency against African Sweet Potato Weevil, Cylas puncticollis, and Fall Armyworm, Spodoptera frugiperda

Cited by 10 publications

References 39 publications

RNA interference (RNAi) applications to the management of fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae): Its current trends and future prospects

RNA interference (RNAi) applications to the management of fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae): Its current trends and future prospects

Analysis of pest management strategies among sweet potato farmers: Insights from a study in Homa Bay County, Kenya

Variation of Morphological Traits and Quality Indices of Micropropagated Melia volkensii Gürke Clones before Field Planting

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