Developmental and population growth rates of phosphine-resistant and -susceptible populations of stored-product insect pests

Sousa, Adalberto Hipólito de; Faroni, L. R. D.; Pimentel, M. A. G.; Guedes, Raul Narciso C.

doi:10.1016/j.jspr.2009.04.003

Cited by 81 publications

(46 citation statements)

References 20 publications

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“…The mortality observed in non-hermetic storage may be related to the age of the insects used in this experiment, which may have died in a natural way when completing their life cycle; the longevity of this species is approximately 140.5 days for females and 142 days for males (Sousa et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

Mortality of insects and quality of maize grains in hermetic and non-hermetic storage

Viebrantz

Radünz

Dionello

2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TDue to the need to improve the quality and safety of foods, chemical methods used to control grain pests have been replaced by alternative methods. For example, modified atmosphere within the storage units has been used. Therefore, the objective was to evaluate maize grain quality and mortality of insects of the species Sitophilus zeamais and Tribolium castaneum in hermetic and non-hermetic environments for 50 days of storage. The hermetic units consisted of polyethylene "bags" with capacity for 60 kg. A cage with 20 adults of each species and 200 g of maize was placed inside each unit. The oxygen level was quantified every five days. Evaluations of insect mortality and survival occurred at 10, 20, 30, 40 and 50 days of storage. At 0, 30 and 50 days, density, moisture and fungal incidence analyses were conducted. The airtight system is efficient in the control of insects, with satisfactory mortality values for both species. Insects favor the development of fungi during the storage, regardless of the storage system.Mortalidade de insetos e qualidade de grãos de milho em armazenamento hermético e não-hermético R E S U M O Devido à necessidade de melhorar a qualidade e a segurança dos alimentos, a utilização de métodos químicos para o controle de pragas de grãos tem sido substituída por métodos alternativos; tem-se, como exemplo, o uso da atmosfera modificada no interior das unidades armazenadoras; portanto, o objetivo do trabalho foi avaliar a qualidade de grãos de milho e a mortalidade de insetos das espécies Sitophilus zeamais e Tribolium castaneum em ambiente hermético e não hermético, durante 50 dias de armazenamento; as unidades herméticas consistiam de "bags" de polietileno com capacidade de 60 kg; no interior de cada unidade foi colocada uma gaiola contendo 20 insetos adultos de cada espécie e 200 g de milho; a cada cinco dias quantificou-se o nível de oxigênio; as avaliações de mortalidade e sobrevivência dos insetos foram realizadas aos 10, 20, 30, 40 e 50 dias de armazenamento; aos 0, 30 e 50 dias foram analisados a massa específica, teor de água e incidência de fungos; o sistema hermético foi eficiente quanto ao controle dos insetos apresentando valores satisfatórios de mortalidade para ambas as espécies; insetos favorecem o desenvolvimento de fungos ao longo do armazenamento, independentemente do sistema de armazenagem.

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Section: Resultsmentioning

confidence: 99%

Mortality of insects and quality of maize grains in hermetic and non-hermetic storage

Viebrantz

Radünz

Dionello

2016

Rev. bras. eng. agríc. ambient.

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“…Pimentel et al (2007) found that reproduction and respiration rates were negatively correlated with resistance ratio across a range of field samples of T. castaneum. Sousa et al (2009) reported a tendency for slower development in more resistant samples, when a range of T. castaneum samples were compared. These studies provide strong evidence for fitness costs associated with phosphine resistance, but they used unselected field samples which may have contained multiple genotypes.…”

Section: Discussionmentioning

confidence: 98%

“…Therefore, knowing if there are fitness costs associated with phosphine resistance could help in resistance management. Fitness has been investigated in a range of insect pests of stored grain using different experimental approaches (Pimentel et al, 2007;Schlipalius et al, 2008;Sousa et al, 2009;Pimentel et al, 2011;Jagadeesan et al, 2012Jagadeesan et al, , 2013Daglish et al, 2014). Some studies have used the population cage approach in which susceptible and resistant strains are hybridized and the resulting populations are reared in the absence of phosphine selection.…”

Section: Introductionmentioning

confidence: 99%

“…Overall, there has been no consistent conclusion about whether being resistant has a fitness cost. In the case of T. castaneum, Pimentel et al (2007) found that reproduction and respiration rate were negatively correlated with resistance ratio across a range of field samples, and Sousa et al (2009) reported that more resistant samples tended to have slower development than more susceptible strains. These studies provide strong evidence for fitness costs associated with phosphine resistance, but they used unselected field samples which may have contained multiple genotypes.…”

Section: Introductionmentioning

confidence: 99%

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Prevalence and potential fitness cost of weak phosphine resistance in Tribolium castaneum (Herbst) in eastern Australia

Daglish

Nayak

Pavic

et al. 2015

Journal of Stored Products Research

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a b s t r a c tThe prevalence of resistance to phosphine in the rust-red flour beetle, Tribolium castaneum, from eastern Australia was investigated, as well as the potential fitness cost of this type of resistance. Discriminating dose tests on 115 population samples collected from farms from 2006 to 2010 showed that populations containing insects with the weakly resistant phenotype are common in eastern Australia (65.2% of samples), although the frequency of resistant phenotypes within samples was typically low (median of 2.3%). The population cage approach was used to investigate the possibility that carrying the alleles for weak resistance incurs a fitness cost. Hybridized populations were initiated using a resistant strain and either of two different susceptible strains. There was no evidence of a fitness cost based on the frequency of susceptible phenotypes in hybridized populations that were reared for seven generations without exposure to phosphine. This suggests that resistant alleles will tend to persist in field populations that have undergone selection even if selection pressure is removed. The prevalence of resistance is a warning that this species has been subject to considerable selection pressure and that effective resistance management practices are needed to address this problem. The resistance prevalence data also provide a basis against which to measure management success.Crown

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“…(Coleoptera: Curculionidae) is a major corn pest and its by products are found in virtually all storage and processing facilities of Brazil (Aguiar et al, 2010;Conceição et al, 2012). This insect is controlled by pyrethroid and organophosphate insecticides (Guedes et al, 2008) and phosphine fumigant (Sousa et al, 2009). However, in view of the high levels of resistance to these insecticides, the incorporation of new forms of control to handle pest insects in the storage sector is important (Freitas et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Bioactivity of diatomaceous earth to Sitophilus zeamais (Coleoptera: Curculionidae) in different application conditions

Sousa¹,

Faroni²,

Andrade

et al. 2013

Rev. bras. eng. agríc. ambient.

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The objective of this study was to evaluate the insecticidal activity of diatomaceous earth (DE) at different ambient temperatures on adult Sitophilus zeamais and progeny, using different doses and exposure periods. The experiments were performed in Petri dishes containing 40 g of the whole corn kernel, treated with DE at doses of 0, 0.25, 0.5 and 1.0 kg Mg -1 . Each dish was infested with 25 S. zeamais adults and kept at climatic chambers under temperatures of 20, 25, 30, 35 and 40 o C. The insect mortality was recorded after six and 15 days from the beginning of the bioassays. The grains evaluated at 15 days were separated from insects and kept in the dishes for another 75 days under the same temperature conditions. After this period the effect of ambient temperature and of diatomaceous earth doses on the emergence of S. zeamais in the F 1 generation was evaluated. It was found that the mortality of S. zeamais increased with the higher dose and temperature during the exposure period of six and 15 days. The number of insects emerged reduced with increasing temperature in these two exposure periods. The increase of temperature and exposure period favored the efficacy of DE in lower doses for control of S. zeamais.Key words: corn weevil, inert dusts, storage, insect control Bioatividade da terra de diatomácea para Sitophilus zeamais (Coleoptera: Curculionidae) em diferentes condições de aplicação RESUMO O objetivo deste trabalho foi avaliar a atividade inseticida da terra de diatomácea (TD) em diferentes temperaturas ambiente sobre adultos de Sitophilus zeamais e sua progênie, utilizando-se diferentes doses e períodos de exposição. Os experimentos foram realizados em placas de Petri contendo 40 g de grãos inteiros de milho, tratados com TD nas doses de 0; 0,25; 0,5 e 1,0 kg Mg -1 . Cada placa foi infestada com 25 adultos de S. zeamais e mantida em câmaras climáticas nas temperaturas de 20, 25, 30, 35 e 40 °C. A mortalidade dos insetos foi contabilizada após seis e 15 dias do início dos bioensaios. Os grãos avaliados aos 15 dias foram separados dos insetos e mantidos nas placas por mais 75 dias sob as mesmas condições de temperatura. Após este período avaliou-se o efeito da temperatura ambiente e das doses da TD sobre a emergência de S. zeamais na geração F 1 . Verificou-se que a mortalidade de S. zeamais aumentou com o incremento da dose e da temperatura nos períodos de exposição de seis e 15 dias; já o número de insetos emergidos reduziu com o aumento da temperatura nesses dois períodos de exposição. O aumento da temperatura e do período de exposição favoreceu a eficácia da TD em menores doses, para controle de S. zeamais.Palavras-chave: gorgulho-do-milho, pós-inertes, armazenamento, controle de insetos

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Developmental and population growth rates of phosphine-resistant and -susceptible populations of stored-product insect pests

Cited by 81 publications

References 20 publications

Mortality of insects and quality of maize grains in hermetic and non-hermetic storage

Mortality of insects and quality of maize grains in hermetic and non-hermetic storage

Prevalence and potential fitness cost of weak phosphine resistance in Tribolium castaneum (Herbst) in eastern Australia

Bioactivity of diatomaceous earth to Sitophilus zeamais (Coleoptera: Curculionidae) in different application conditions

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