Establishment, Spread, and Impact of
Teretriosoma nigrescens
(Coleoptera: Histeridae), an Exotic Predator of the Larger Grain Borer (Coleoptera: Bostrichidae) in Southwestern Benin

Borgemeister, Christian; Djossou, Felicien; Adda, Cyrille; Schneider, Heiner; Djomamou, B.; Degbey, P.; Azoma, Ben; Markham, R.H.

doi:10.1093/ee/26.6.1405

Cited by 27 publications

(21 citation statements)

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“…They suggested that the Þrst peak of the yearly bimodal P. truncatus ßight activity pattern in southern Benin was associated with the time period during which maize stores were destocked and therefore disturbed, while the second peak was associated with phenology of unidentiÞed forest substrates. However, in Lokossa in southwestern Benin, Borgemeister et al (1997a) only showed a distinct bimodal P. truncatus ßight activity pattern in two out of six seasons. A bimodal ßight activity pattern was seen in 1998 for the pheromone traps in near Bohicon (Fig.…”

Section: Discussionmentioning

confidence: 83%

“…As part of the on-going monitoring of P. truncatus incidence in West Africa, workers at IITA have maintained pheromone traps at eight sites near Lokossa (6Њ 39 min N, 1Њ 51 min E) in south western Benin since 1991 (Fig. 1); the sites were described by Borgemeister et al (1997a). This region is one of the main maize-producing regions in Benin and was also the area of Benin where P. truncatus was Þrst recorded (Anonymous 1986).…”

Section: Methodsmentioning

confidence: 99%

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Sensitivity ofProstephanus truncatus(Coleoptera: Bostrichidae) Flight Activity to Environmental Variables in Benin, West Africa

et al. 2001

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Section: Discussionmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Sensitivity ofProstephanus truncatus(Coleoptera: Bostrichidae) Flight Activity to Environmental Variables in Benin, West Africa

et al. 2001

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“…Besides attacking stored food, the pest has large populations in the natural environment where its main host is believed to be dead wood (Nang'ayo et al, 1993). Monitoring the incidence of P. truncatus using pheromone-baited flight traps has shown that the number of beetles trapped varies considerably between seasons and years in Mexico (Rees et al, 1990), Kenya (Giles et al, 1995) and Benin (Borgemeister et al, 1997a). Furthermore, it has been shown that there is a significant positive correlation between trap catch and the likelihood that stored food becomes infested (Birkinshaw et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Can observation of climatic variables be used to predict the flight dispersal rates of Prostephanus truncatus?

Hodges¹,

Addo²,

Birkinshaw³

2003

Agri and Forest Entomology

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1 Attack by Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) on the maize and cassava stored by small-holder farmers in Africa is sporadic, varying considerably within and between years. The risk that food in store will become infested is related to the number of beetles dispersing by flight. A means of predicting years with high dispersal rates is needed to warn farmers when to be vigilant. 2 The relationship between climatic variables and pheromone trap catches was observed in a forest-savannah transition zone in Ghana. These observations were used to devise a model using a mix of biological and empirical rules that operate on temperature and humidity data. The predicted and actual trap catch deviated by only þ5% to À1% in years when there were high dispersal rates. 3 The first part of the model estimates the numbers of beetles with potential for dispersal. The second part predicts the proportion likely to disperse. This is based on the apparent effect that those P. truncatus developing under low temperature conditions (about 24 C) have a lowered propensity for flight, a response previously observed in a related species. 4 The model was validated using climate data and trap catches from a woodlandsavannah zone and a short grass steppe zone. With minor adjustment, the model worked well for these two habitats.

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“…Within 4 yr of the release of T. nigrescens in southern Togo in early 1991, both pheromone trap catches of P. truncatus and its incidence in grain stores declined in southern Benin (Borgemeister et al 1997a). This phenomenon was largely attributed to predation by T. nigrescens (Borgemeister et al 1997a, Neuenschwander andMarkham 2001).…”

Section: Resultsmentioning

confidence: 99%

“…Some workers (e.g., Golob and Hanks 1990) have proposed chemical control of these pests in traditional systems. A natural enemy of P. truncatus, Teretrius nigrescens (Lewis) (Coleoptera: Histeridae) was released in West Africa in the early 1990s and has been credited with reducing losses of stored maize to P. truncatus (Borgemeister et al 1997a). More recent work has shown that P. truncatus infestations in maize stores continue to be a problem; surveys conducted in Benin in 1997Ð1998 found that 24 of 102 grain stores were infested with P. truncatus .…”

mentioning

confidence: 99%

Pest Management in Traditional Maize Stores in West Africa: a Farmer’s Perspective

Meikle¹,

Markham²,

Nansen³

et al. 2002

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Farmers in the Republic of Benin have few resources to invest in protection of stored maize, and prophylactic pesticide application is often recommended by extension and development agencies. Neither the efficacy nor profitability of such an application in traditional maize storage facilities has been addressed quantitatively. In this study, existing management options for stored maize were evaluated monthly over 6 mo in central and southern Benin with respect to their effects on grain injury and on densities of Prostephanus truncatus (Horn) and Sitophilus zeamais Motschulsky. P. truncatus infested 54% of the experimental stores in the study even though Teretrius nigrescens (Lewis), a natural enemy introduced against P. truncatus, was well established in the region. S. zeamais was the most common pest, found in 85% of the experimental storage facilities. Prophylactically treated maize was, on average, worth more than untreated maize for month 1 through 5 in southern Benin, after taking into account market price, pesticide costs, percentage grain damage and weight loss, but maize storage was not profitable overall. No difference was observed between treatments in central Benin. After 6 mo treated storage facilities were not significantly different from untreated storage facilities in terms of either percentage damage or profit in either region. A rapid scouting plan intended to provide farmers with a means for identifying storage facilities at greatest risk of severe P. truncatus infestation was field validated. Given that unsafe pesticide use is prevalent in Benin, research and extension services should clearly state the limitations to prophylactic treatment and increase the effort to educate farmers on appropriate pesticide use, store monitoring and marketing.

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Establishment, Spread, and Impact of Teretriosoma nigrescens (Coleoptera: Histeridae), an Exotic Predator of the Larger Grain Borer (Coleoptera: Bostrichidae) in Southwestern Benin

Cited by 27 publications

References 0 publications

Sensitivity ofProstephanus truncatus(Coleoptera: Bostrichidae) Flight Activity to Environmental Variables in Benin, West Africa

Sensitivity ofProstephanus truncatus(Coleoptera: Bostrichidae) Flight Activity to Environmental Variables in Benin, West Africa

Can observation of climatic variables be used to predict the flight dispersal rates of Prostephanus truncatus?

Pest Management in Traditional Maize Stores in West Africa: a Farmer’s Perspective

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