Abundance and diversity of lepidopteran stemborers and their parasitoids on selected wild grasses in Uganda

Matama-Kauma, Teddy; Schulthess, Fritz; Rü, Bruno Pierre Le; Mueke, J. M.; Ogwang, J.; Omwega, C. O.

doi:10.1016/j.cropro.2007.08.003

Cited by 35 publications

(28 citation statements)

References 30 publications

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“…High and low abundance of parasitoids, respectively, in cultivated and natural habitats concurs with the work of Kruess (2003), showing that parasitoid abundance was positively correlated with herbivore abundance. In line with the resource concentration hypothesis (Root 1973) and previous results by Ndemah et al (2007) and Matama-Kauma et al (2008), stem borer density was generally low in natural habitats. Low stem borer host abundance in this study coupled with a high density of nonhost plant species in natural habitats existing in the same localities (Otieno et al 2006(Otieno et al , 2008 suggests host Þnding difÞculty of parasitoids in such habitats (Chabi-Olaye et al 2005).…”

Section: Discussionsupporting

confidence: 87%

“…Generally higher parasitoid diversity in natural habitats in this study and those of Ndemah et al (2007) and Matama-Kauma et al (2008), but higher parasitoid abundance in cultivated habitats (Matama-Kauma et al 2008, MailaÞya et al 2009), partially support the "natural enemy" hypothesis (Root 1973). Altogether, these studies indicate that stem borer parasitoid abundance is not necessarily high in natural habitats with high parasitoid species diversity.…”

Section: Discussionsupporting

confidence: 85%

“…Previous studies indicate that stem borer densities were much lower on wild host plants than on adjacent cultivated cereal crops (Gounou and Schulthess 2004, Ndemah et al 2007, Matama-Kauma et al 2008. Therefore, to increase the chances of collecting stem borer parasitoids from different habitats, a random sampling scheme was used in cultivated habitats, whereas both random and nonrandom sampling schemes were applied in natural habitats.…”

Section: Field Surveysmentioning

confidence: 99%

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Factors Affecting Stem Borer Parasitoid Species Diversity and Parasitism in Cultivated and Natural Habitats

et al. 2010

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The effects of biotic and abiotic factors on stem borer parasitoid diversity, abundance, and parasitism were studied in cultivated and natural habitats in four agroecological zones in Kenya. Comparing habitat types, we found partial support for the "natural enemy" hypothesis, whereby, across all localities, parasitoid diversity was higher in more diverse host plant communities in natural habitats, whereas parasitoid abundance was higher in cultivated habitats. For both habitats, parasitoid richness was mainly influenced by stem borer density and/or its interaction with stem borer richness, whereas parasitoid abundance was mainly affected by stem borer abundance. Parasitoid richness was higher in localities (with bimodal rainfall distribution) with increased spatial and temporal availability of host plants that harbored the borers. Across seasons, parasitoid richness was lower in both cultivated and natural habitats in the driest locality, Mtito Andei. Overall, parasitoid diversity was low in Suam and Mtito Andei, where maize cultivation was practiced on a commercial scale and intense grazing activities persist across seasons, respectively. Across localities, habitats, and seasons, stem borer parasitism was positively correlated with parasitoid richness and abundance. Furthermore, the interaction of rainfall and altitude influenced the presence and absence of parasitoids, and consequently, stem borer parasitism. Parasitism was positively and negatively correlated with temperature in cultivated and natural habitats, respectively. Overall, natural habitats seem to serve as important refugia for sustaining parasitoid diversity, which in turn can affect stem borer parasitism in the cereal cropping system.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 85%

Section: Field Surveysmentioning

confidence: 99%

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Factors Affecting Stem Borer Parasitoid Species Diversity and Parasitism in Cultivated and Natural Habitats

et al. 2010

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“…Studies have revealed the presence and high diversity of stemborer species in East and Southern Africa (Le Ru et al, 2006a,b;Matama-Kauma et al, 2008;Moolman et al, 2014;Ong'amo et al, 2006), but the most economically important species are the crambid Chilo partellus (Swinhoe), and the noctuids Busseola fusca (Fuller) and Sesamia calamistis Hampson Ong'amo et al, 2006). A summary of their main characteristics is presented in Table 1.…”

Section: Stemborersmentioning

confidence: 98%

Assessing the long-term welfare effects of the biological control of cereal stemborer pests in East and Southern Africa: Evidence from Kenya, Mozambique and Zambia

Midingoyi

Affognon

Macharia

et al. 2016

Agriculture, Ecosystems & Environment

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A B S T R A C TThe International Centre of Insect Physiology and Ecology (icipe), undertook a biological control (BC) programme for control of stemborers from 1993 to 2008, to reduce cereal yield losses due to stemborer attack in East and Southern Africa. The programme released four biological control agents-the larval parasitoids Cotesia flavipes and Cotesia sesamiae, the egg parasitoid Telenomus isis and the pupal parasitoid Xanthopimpla stemmator-to control the economically important stemborer pests Busseola fusca, Chilo partellus and Sesamia calamistis. Two of the natural enemies that were released got established and spread to many localities in the region. This study adopted the economic surplus model based on production, market and GIS data to evaluate the economic benefits and cost-effectiveness of the programme in three countries-Kenya, Mozambique and Zambia. Findings show that the biological control intervention has contributed to an aggregate monetary surplus of US$ 1.4 billion to the economies of the three countries with 84% from maize production and the remaining 16% from sorghum production. The net present value over the twenty years period was estimated at US$ 272 million for both crops and ranged from US$ 142 million for Kenya to US$ 39 million for Zambia. The attractive internal rate of return (IRR) of 67% compared to the considered discount rate of 10%, as well as the estimated benefit-cost ratio (BCR) of 33:1, illustrate the efficiency of investment in the BC research and intervention. The estimated number of people lifted out of poverty through the BC-programme was on average 57,400 persons (consumers and producers) per year in Kenya, 44,120 persons in Mozambique, and 36,170 persons in Zambia, representing an annual average reduction of poor populations, respectively of 0.35, 0.25 and 0.20% in each of the three countries. These findings underscore the need for increased investment in BC research to sustain cereal production and improve poor living conditions.

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“…Until recently, very little was known about Acrapex host preferences as specimens had been obtained mainly from light trap collections. Extensive surveys conducted since 2004 (Le Ru et al 2006Ru et al a, 2006bOng'amo et al 2006Ong'amo et al , 2013Ong'amo et al , 2014Ndemah et al 2007;Matama-Kauma et al 2008;Moolman et al 2014) in several sub-Saharan countries, targeting wild habitats rich in Poaceae and combining infested host plant collections and light traps, allowed us to obtain several hundred specimens of Acrapex. A recent study by Le Ru et al (2014) focused on a LE RU B. et al, Contribution to Acrapex systematics 3 small group of morphologically related species belonging to subsets of two (groups B and C) of the four morphological groups that have been defined by Berio (1973) based on male genitalia.…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic analysis and systematics of the Acrapex unicolora Hampson species complex (Lepidoptera, Noctuidae, Apameini), with the description of five new species from the Afrotropics

Rü

Capdevielle‐Dulac

Musyoka

et al. 2017

EJT

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D N A L i b r a r y o f L i f e , r e s e a r c h a r t i c l eurn:lsid:zoobank.org:pub:7E8B1A8F-48C1-433B-A34E-A95CDDE3D13F We also conducted molecular phylogenetic analyses (using maximum likelihood) and molecular species delimitation analyses on a comprehensive sample of 61 specimens belonging to eight of the studied species. Molecular phylogenetic analyses provided additional evidence of the synonymy of Acrapex and Poecopa, whereas molecular species delimitation analyses support the validity of the five newly described species and unravel another potential new species, only collected in the larval stage.

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Abundance and diversity of lepidopteran stemborers and their parasitoids on selected wild grasses in Uganda

Cited by 35 publications

References 30 publications

Factors Affecting Stem Borer Parasitoid Species Diversity and Parasitism in Cultivated and Natural Habitats

Factors Affecting Stem Borer Parasitoid Species Diversity and Parasitism in Cultivated and Natural Habitats

Assessing the long-term welfare effects of the biological control of cereal stemborer pests in East and Southern Africa: Evidence from Kenya, Mozambique and Zambia

Phylogenetic analysis and systematics of the Acrapex unicolora Hampson species complex (Lepidoptera, Noctuidae, Apameini), with the description of five new species from the Afrotropics

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