Competition between Prostephanus truncatus (Horn) and Sitophilus zeamais (Motsch.) in maize at two temperatures

Giga, D. P.; Canhao, J.

doi:10.1016/0022-474x(93)90023-w

Cited by 37 publications

(29 citation statements)

References 11 publications

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“…6b). This interference has been found earlier, both in the laboratory (Böye 1988;cited by Mutlu 1994) and in the field in Togo (Mutlu 1994), although in loose maize S. zeamais may have the competitive advantage over P. truncatus (Giga & Canhao 1993). Our study points to the intraspecific density-dependence of the predator (Fig.…”

Section: Figsupporting

confidence: 86%

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 From published and unpublished data from experimental maize stores in Benin, West Africa, we derived statistical models describing the in-store insect population dynamics, and were thus able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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Section: Figsupporting

confidence: 86%

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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“…The coexistence of different insect species in grains storage can be due to their roles in ecological succession or their differences in the way that each insect infests the stored product, which of-ten lead to eventual interspecific competition and potential increase of grain loss. The outcome of the insect competition is apparently determined by several biotic and abiotic conditions, including temperature [24] [25] [26]. However, there is still inadequate information regarding the strategies of the interspecific competition and grain-hosts selection of these major stored-grain insects.…”

Section: Introductionmentioning

confidence: 99%

Interspecific Competition and Grain-Hosts Selection of Maize Weevil, <i>Sitophilus zeamais</i> (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, <i>Prostephanus truncatus</i> (Horn) (Coleoptera; Bostrichidae)

Ngom¹,

Thiaw²,

Sembène³

2020

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Laboratory interspecific competition and grain-hosts selection experiments involving maize weevil (MW), Sitophilus zeamais (Motsch.) and larger grain borer (LGB), Prostephanus truncatus (Horn) were performed under ambient temperature and relative humidity (25˚C-35˚C and 70%-80% relative humidity) in their major host cereal, maize grains. The species reproductive rate and grain-hosts preference were evaluated by a number of emerged adults. In combined infestation, both species competed intensively by simultaneously increasing their individuals' emergence, 9-fold or greater than when reared alone. Even though both species simultaneously increased their progeny, S. zeamais was the dominant competitor and had a significant suppressant effect on P. truncatus. The selection result of grain-hosts showed that P. truncatus placed in the environment containing both uninfested maize grains and grains previously infested by S. zeamais, the insect prefers uninfested grains. Indeed, P. truncatus individuals' emergences were significantly more important to uninfested grains than to infested grains. The weevil-infested grains seemed to have deterrent and detrimental effects on P. truncatus. Conversely, S. zeamais selection of grain-hosts was significantly (P = 0.0001) more attracted by P. truncatus infested grains than to uninfested grains. Sitophilus zeamais individuals' emergences were significantly (P = 0.0008) more important to infested grains than to uninfested grains. The S. zeamais preference on grains previously infested would be stimulated by P. truncatus larval vibrations in grain. How to cite this paper: Ngom, D., Thiaw, C. and Sembène, M. (2020) Interspecific Competition and Grain-Hosts Selection of Maize Weevil, Sitophilus zeamais (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, Prostephanus truncatus (Horn) (Coleoptera; Bostrichidae). Advances in Entomology,

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“…The ecological and evolutionary implications of changes in organism abundances and population dynamics due to competition have long been discussed (Gurevitch et al, 1992;Giga & Canhao, 1993;Schluter, 1994;Teixeira & Zucoloto, 2012). Organisms that grow under competition during a substantial period of their lifetimes usually have lower fitness than those that were not exposed to competition (Colegrave, 1995;Reeve et al, 2000;Briffa & Sneddon, 2010).…”

Section: Introductionmentioning

confidence: 99%

The interaction effect between intraspecific competition and seed quality on the life‐history traits of the seed‐feeding beetleAcanthoscelides macrophthalmus

Cesar

Rossi

2019

Entomologia Exp Applicata

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It has been shown that intraspecific competition and resource quality may affect life‐history traits of insects, such as body size, fecundity, and survival. However, intraspecific competition and resource quality may interact with each other. The study of such interacting effects is crucial for understanding the influence of these ecological variables on the selection of specific life‐history traits. Here, we investigated whether the interaction between intraspecific larval competition and variation in resource quality affects adult emergence and survival, egg size, fecundity, body size, and sexual size dimorphism (SSD) of the seed‐feeding beetle Acanthoscelides macrophthalmus (Schaeffer) (Coleoptera: Chrysomelidae: Bruchinae) when infesting Leucaena leucocephala (Lam.) De Wit (Fabaceae), its host plant. In the laboratory, beetles were reared on seeds that differed in quality (e.g., different hardness, seed size, water content), in the presence or absence of larval competition. Body size and SSD did not differ between treatments (with and without competition), nor were they affected by varying resource quality. Females subjected to competition during the larval stage and females emerging from seeds of higher quality, displayed the highest fecundity. The proportion of emergent adults was higher in the absence of competition. In addition, larger eggs were laid on the low‐quality resource in the absence of competition, showing a trade‐off between egg size and egg number. Adult survival differed among treatments and resource qualities, suggesting a higher investment in adult survival for individuals emerging from seeds of low quality in the presence of competition. Whether changes in specific traits could be selected for in detriment of others will depend on the strength of intraspecific competition, the variation in resource quality, and the plasticity in the life‐history traits investigated. This needs further clarification.

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Competition between Prostephanus truncatus (Horn) and Sitophilus zeamais (Motsch.) in maize at two temperatures

Cited by 37 publications

References 11 publications

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

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

Interspecific Competition and Grain-Hosts Selection of Maize Weevil, <i>Sitophilus zeamais</i> (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, <i>Prostephanus truncatus</i> (Horn) (Coleoptera; Bostrichidae)

The interaction effect between intraspecific competition and seed quality on the life‐history traits of the seed‐feeding beetleAcanthoscelides macrophthalmus

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Competition between Prostephanus truncatus (Horn) and Sitophilus zeamais (Motsch.) in maize at two temperatures

Cited by 37 publications

References 11 publications

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

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

Interspecific Competition and Grain-Hosts Selection of Maize Weevil, &lt;i&gt;Sitophilus zeamais&lt;/i&gt; (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, &lt;i&gt;Prostephanus truncatus&lt;/i&gt; (Horn) (Coleoptera; Bostrichidae)

The interaction effect between intraspecific competition and seed quality on the life‐history traits of the seed‐feeding beetleAcanthoscelides macrophthalmus

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Interspecific Competition and Grain-Hosts Selection of Maize Weevil, <i>Sitophilus zeamais</i> (Motsch.) (Coleoptera; Dryophtoridae) and Larger Grain Borer, <i>Prostephanus truncatus</i> (Horn) (Coleoptera; Bostrichidae)