Studies on predation of Prostephanus truncatus (Horn) (Col., Bostrichidae) and Sitophilus zeamais Mots. (Col., Curculionidae) at different densities on maize by Teretriosoma nigrescens Lewis (Col., Histeridae)

Ayertey, J.N.; Meikle, William G.; Borgemeister, Christian; Cámara, Miguel; Markham, R.H.

doi:10.1046/j.1439-0418.1999.00365.x

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…Only 3% of beetles collected in pheromone traps provided prey protein that could be clearly identified, however, a significantly higher proportion of larval and adult T. nigrescens sampled in maize stores yielded positive results. Despite these limitations, electrophoretic analysis of gut content was shown to be a powerful method, in this case indicating that T. nigrescens has a strong preference for Prostephanus truncatus (Horn) (Col.. Bostrichidae) (see also Ayertey et al, 1999). It should be noted though that this method can only be used in the country of origin if host range is to be determined prior to release of the biological control agent.…”

Section: Field Surveysmentioning

confidence: 99%

Methods Used to Assess Non-target Effects of Invertebrate Biological Control Agents of Arthropod Pests

2005

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The number of concerns regarding potential non-target effects of invertebrate biological control agents of arthropods has risen over the last decade and an increasing number of studies have since dealt with this topic. Despite some recent international initiatives aimed at providing guidance for risk assessment of biological control agents, detailed methods on how tests should be designed and conducted to assess for potential non-target effects still need to be provided. It is believed that this review comes at an ideal time, giving an overview of methods currently applied in the study of non-target effects in biological control of arthropod pests. It provides the first step towards the ultimate goal of devising guidelines for the appropriate methods that should be universally applied for the assessment and minimisation of potential non-target effects. The main topics that are reviewed here include host specificity (including field surveys, selection of non-target test species and testing protocols), post-release studies, competition, overwintering and dispersal. Finally, a number of conclusions that have emerged from this comprehensive compilation of studies are drawn, addressing potential non-target effects in arthropod biological control.

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Section: Field Surveysmentioning

confidence: 99%

Methods Used to Assess Non-target Effects of Invertebrate Biological Control Agents of Arthropod Pests

2005

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“…[6,7] This suggests the fact that therefore their multiplication rate was limited during storage. According to Ayertey et al, growth and multiplication of P. truncatus in storeage is slow when grain is predominated by weevils [1].…”

Section: B the Most Prevalent Insect Pests Of Stored Maize In Makondmentioning

confidence: 99%

Efficacy of Traditional and Improved Granaries in Protecting Maize from Prostephanus truncatus in Small Holder Farming Storage System in Makonde District, Zimbabwe

Admire¹,

Chawafambira²,

Tinashe³

2014

WJAR

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The study was carried out in Makonde District, located 17°21' S and 30°12' E in Mashonaland West Province to assess the efficiency of improved and traditional granaries in protecting traditional and hybrid maize from Prostephanus truncatus. Ten farmers were randomly selected from 20 wards in the District. Multistage cluster sampling and purposive sampling techniques were used. Amongst the 10 selected farmers, 5 were using traditional granaries and the other 5 were using improved granaries. Four farmers used in the study stored a traditional maize variety (Hickory King) and six farmers stored a hybrid variety (SC 513). Demographic data on the farmers was captured on a questionnaire which was conducted at the beginning of the study. The questionnaire had information on type of storage granary, age of farmers, type of stored maize variety, amount of maize stored, major prevalent pests and grain management practices. Hybrid and traditional maize varieties stored in selected improved and traditional granaries. The maize varieties were first fumigated for a week using phosphine tablets and granaries were first disinfected using Deltamethrin (2.4% w.p) at 1.5g/l water at 20ml/m 2. Fumigated traditional and hybrid maize were then stored in disinfected granaries. Maize grains were stored for 6 months. Traditional, intermediate traditional, intermediate improved, improved granaries had 36%, 16%, 30% and 18% utilization amongst farmers respectively. Age of farmers showed a significant influence on the type of granary used to store their grain. Sitophilus zeamais, Prostephanus truncatus, Sitotroga cereallela were most prevalent insect species. The relative abundance of these pests in the granaries was 100%, 70% and 85% respectively. Hybrid maize (SC 513) was reinfested with Prostephanus truncatus after 3 months during storage in traditional granaries. The relative abundance of pests in a granary was influenced by the farmer duration of storage and the treatment. It was concluded that traditional granaries used by farmers were found to be prone to Prostephanus truncatus infestation as compared to improved granaries. There was a significant difference in the variations between granary type, maize variety and levels of Prostephanus truncatus infestation.

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“…Reviewing the numerous laboratory studies that have demonstrated the non-specific food choice of T. nigrescens (confirmed by later studies; Oussou, Meikle & Markham 1998;Ayertey et al 1999), Markham, Borgemeister & Meikle (1994a) proposes non-specificity as a possible benefit for biological control by enabling the predator to survive periods with scarce but diverse prey. The possibility of undesirable effects on non-target organisms, however, must be taken into account (Neuenschwander & Markham 2001).…”

Section: S Zeamais P Truncatus T Nigrescensmentioning

confidence: 97%

“…Teretrius nigrescens larvae and adults are predators of P. truncatus eggs and larvae which, in confined food‐choice experiments, are preferred over other stored‐product pests (Rees 1987). Yet (i) the numerical response of the predator is enhanced when weevil larvae, Sitophilus zeamais Motschulsky, are offered in addition (Ayertey et al . 1999) and (ii) when offered S. zeamais alone, the predator develops nearly as fast as on its preferred prey (Oussou, Meikle & Markham 1998).…”

Section: Introductionmentioning

confidence: 99%

Teretrius nigrescens against larger grain borer Prostephanus truncatus in African maize stores: biological control at work?

Holst

Meikle

2003

Journal of Applied Ecology

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Summary 1.Following the accidental introduction of the bostrichid beetle Prostephanus truncatus into East and West Africa around 1980, a classical biological control campaign was launched in 1991; the histerid beetle Teretrius nigrescens was released as a biocontrol agent to prevent the destructive outbreak of the pest in small-farm maize stores. However, while the campaign has been ongoing, so has discussion in the scientific community about the merits of this campaign and its chances of success. 2. From published and unpublished data from experimental maize stores in Benin, West Africa, we derived statistical models describing the in-store insect population dynamics, and were thus able to point out significant biological interactions and to explain the observed lack of biological control. 3. We found that (i) T. nigrescens reduced significantly the population growth rate of both P. truncatus and the non-target pest, the weevil Sitophilus zeamais ; (ii) T. nigrescens displayed a positive numerical response to both prey species, P. truncatus and S. zeamais ; (iii) asymmetric competition existed between the two prey species, S. zeamais was negatively affected by P. truncatus but not vice versa; (iv) T. nigrescens and S. zeamais displayed negative intraspecific density-dependence whereas P. truncatus was resource-limited. 4. We conclude that classical biological control with T. nigrescens is not likely to become successful, mainly due to the predator's intraspecific density-dependence and its low population growth rate compared with its prey. We recommend that further research on P. truncatus integrated pest management takes into account the farmer as an active agent managing the store. 5. Synthesis and applications. When biocontrol does not result in satisfactory pest control, as in the case of P. truncatus , farmers should learn how to scout for the pest and take action when a need is detected. In areas where the pest is usually only a minor problem, the agricultural extension service should consider setting up a simple early warning system for their region. When attempts at classical biological control remain unsuccessful, as in the case of P. truncatus now for 10 years, policy-makers should prioritize training of extension service and farmers in integrated pest management techniques (e.g. needbased use of insecticides) as a necessary supplement to biocontrol.

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Studies on predation of Prostephanus truncatus (Horn) (Col., Bostrichidae) and Sitophilus zeamais Mots. (Col., Curculionidae) at different densities on maize by Teretriosoma nigrescens Lewis (Col., Histeridae)

Cited by 10 publications

References 8 publications

Methods Used to Assess Non-target Effects of Invertebrate Biological Control Agents of Arthropod Pests

Methods Used to Assess Non-target Effects of Invertebrate Biological Control Agents of Arthropod Pests

Efficacy of Traditional and Improved Granaries in Protecting Maize from <i>Prostephanus truncatus</i> in Small Holder Farming Storage System in Makonde District, Zimbabwe

Teretrius nigrescens against larger grain borer Prostephanus truncatus in African maize stores: biological control at work?

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