Host preference ofXanthopimpla stemmator(Hymenoptera: Ichneumonidae) and its reproductive performance on selected African lepidopteran stem borers

Gitau, Catherine W.; Ngi-Song, Adèle J.; Otieno, Syprine; Overholt, William A.

doi:10.1080/09583150701311572

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…To evaluate the impact of biological control, many studies have used the host-parasite relationship model to demonstrate the effect of parasitism by the natural agents on the stemborer density reduction (Gitau et al, 2005(Gitau et al, , 2007Jiang et al, 2008;Zhou et al, 2001). However, little is known about the causal effect of the density reduction on crop yield loss abatement or the gain attributable to the parasitism effect.…”

Section: Yield Gains or Abated Losses Attributable To The Bc-agents (mentioning

confidence: 99%

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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Section: Yield Gains or Abated Losses Attributable To The Bc-agents (mentioning

confidence: 99%

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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“…Xanthopimpla species are idiobiont endoparasitoids of Lepidoptera pupae (Gauld 1991). For this reason, several species have been utilized in biological control of economically important agricultural pests (Hailemichael et al 1994;Gitau et al 2007;Dum et al 2011). Many species are abundant in tropical areas, especially in tropical Asia where most of the species occur (Townes & Chiu 1970;Pham et al 2011).…”

Section: Introductionmentioning

confidence: 99%

The Neotropical species of Xanthopimpla Saussure (Hymenoptera: Ichneumonidae: Pimplinae)

Gómez

Sääksjärvi

Broad

et al. 2014

Zootaxa

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Xanthopimpla Saussure, 1892 is one of the largest and best studied genera of the family Ichneumonidae. It is most species rich in the Oriental and Afrotropical regions with only a few species occurring in Central and South America. The present study reviews the Neotropical species of the genus including descriptions of four new species from Amazonia and Northeast South America. We define a new species group: the amazonica species-group, to accommodate the following five species: X. amazonica Gómez, Sääksjärvi & Veijalainen, X. guianensis Gómez & Sääksjärvi sp. n., X. jussilai Veijalainen, Sääksjärvi & Broad, X. pucallpensis Gómez & Sääksjärvi sp. n. and X. vidali Gómez sp. n. The aurita species-group, which had hitherto been regarded as the only species-group in the Neotropical region, is currently represented by five species: X. allpahuaya Gómez & Sääksjärvi sp. n., X. aurita Krieger, X. craspedoptera Krieger, X. rhabdomera Townes and X. spiloptera Krieger. The Andean species X. peruana Krieger is established as an unplaced species outside of the amazonica and aurita species-groups. A key to Neotropical species-groups and species of Xanthopimpla is provided. Xanthopimpla aurita is recorded for the first time from Ecuador and Colombia and its extensive distribution is discussed. Xanthopimpla amazonica, X. craspedoptera and X. jussilai are recorded for the first time from Brazil; X. amazonica is recorded for the first time from French Guiana; X. spiloptera is recorded for the first time from French Guiana and Peru, and X. rhabdomera is recorded for the first time from Peru.

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“…These natural enemies include the following: the larval parasitoid Cotesia flavipes (Cameron), imported from Asia, the original home of the pest C. partellus; the egg parasitoid Telenomus isis (Polaszek), imported from West Africa; the pupal parasitoid Xanthopimpla stemmator (Thunberg), imported from Asia to complement C.flavipes; and the larval Cotesia sesamia (Cameron), found in the western part of Kenya but redistributed in the region of Taita-Taveta, Kenya. Evidence on the effectiveness of these released natural enemies in the establishment and spread from release sites, as well as in reducing pest density, has been reported in various entomology studies (Zhou et al, 2001;Jiang et al, 2006;Omwega et al, 2006;Gitau et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Estimating the impact of biological control of maize stemborers on productivity and poverty in Kenya: a continuous treatment approach

Midingoyi

Kassie

Affognon

et al. 2023

Environ Dev Sustain

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This study examines the farm-level effects of stemborers' biological control (BC) using biological and household survey data collected in rural Kenya. The authors use a continuous treatment impact-evaluation method to estimate BC's average and marginal treatment effects. Findings indicate that, on average, a one percent increase in the intensity of BC increases maize yield by 9.3 kg per hectare and reduces the poverty level of maize-growing farm households by 0.5%. Developing and promoting biological control can be seen as an additional tool in the fight against food insecurity and poverty in Africa through controlling important pests.

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Host preference ofXanthopimpla stemmator(Hymenoptera: Ichneumonidae) and its reproductive performance on selected African lepidopteran stem borers

Cited by 6 publications

References 25 publications

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

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

<p><strong>The Neotropical species of <em>Xanthopimpla</em> Saussure (Hymenoptera: Ichneumonidae: Pimplinae)</strong></p>

Estimating the impact of biological control of maize stemborers on productivity and poverty in Kenya: a continuous treatment approach

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