O complexo de Sitophilus spp (Coleoptera Curculionidae) no Estado de São Paulo

Rossetto, C. J.

doi:10.1590/s0006-87051969000100010

Cited by 18 publications

(14 citation statements)

References 8 publications

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“…Such migration Due to its high biotic potential and to the fact that infestations start in the fi eld and are brought into the store, Sitophilus oryzae (L) and Sitophilus zeamais Motsch are considered the most destructive pests that attack stored corn and wheat grain in Brazil (Gallo et al 2002). Although both species can develop on both types of grain, S. oryzae has a marked preference for wheat, while S. zeamais strongly prefers corn (Rossetto 1969, Athié & Paula 2002.…”

Section: Resultsmentioning

confidence: 99%

“…Under laboratory conditions, both species can be reared on both types of grains, but under storage conditions there is a marked preference of S. oryzae for wheat and of S. zeamais for corn (Athié & Paula 2002). In this respect, Rossetto (1969) evaluated corn samples collected in the State of São Paulo and found 169 samples infested with S. zeamais, 11 samples infested with both S. oryzae and S. zeamais, and a single sample infested with S. oryzae. When both species infest the same mass of grains, competition between them results in the elimination of S. oryzae in corn and of S. zeamais in wheat (Birch 1954apud Coombs & Porter 1986.…”

Section: Methodsmentioning

confidence: 99%

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Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides

Vásquez-Castro¹,

Baptista²,

Trevizan³

et al. 2009

Neotrop. entomol.

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-Insect-pest mobility can infl uence insect susceptibility to the insecticides used to control them. The objective of this work was to evaluate the fl ight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch populations reared on corn and wheat grains, and its relationship with insecticide susceptibility. Unsexed adult insects with ages between 10 and 20 days were placed on a plastic tray. A 40-watt incandescent light bulb was positioned at a 50 cm height relative to the tray. Flight activity was evaluated during 30 min. In the LC 50 estimation bioassays, the insects were exposed to dry residues of the organophosphorus insecticide fenitrothion and of the pyrethroid insecticide esfenvalerate on the internal surface of glass vials. Mortality was evaluated 24h after installation of the experiments. Sitophilus zeamais showed greater fl ight activity when compared with S. oryzae; likewise, insects reared on corn had greater fl ight activity than those reared on wheat. Sitophilus oryzae was less susceptible to the insecticides studied than S. zeamais. Adults reared on wheat were more susceptible to the insecticides than those reared on corn. This study demonstrates that the lower fl ight activity of S. oryzae is related to its greater tolerance to insecticides.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides

Vásquez-Castro¹,

Baptista²,

Trevizan³

et al. 2009

Neotrop. entomol.

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“…Here, we reported a survey and mapped the distribution of these two weevil species in the Brazilian territory and expanded further the initial distribution diagnosis of these species in the Brazilian state of São Paulo, which dated from the late 1960s (Rossetto, ). Such distribution was determined using two techniques, inspection of the male genitalia and amplification of a region of the mitochondrial gene cytochrome oxidase subunit I (COI) using designed species‐specific primers with the intent of distinguishing the maize from the rice weevil species.…”

Section: Introductionmentioning

confidence: 85%

Distribution of the related weevil species Sitophilus oryzae and S. zeamais in Brazil

Corrêa¹,

Oliveira

Braga³

et al. 2012

Insect Science

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The genus Sitophilus (Coleoptera: Curculionidae) encompasses species of great economic importance as stored grain pests worldwide. Among these species, the maize and the rice weevils (Sitophilus zeamais and Sitophilus oryzae, respectively) are particularly important in warmer climates. These two weevils exhibit closely morphological and ecological resemblance making difficult their proper identification and recognition of their distribution in grain-producing regions. Both species are recorded in South America and particularly in Brazil, but their respective distribution and prevalence were not yet assessed in the region. Therefore, several insect samples throughout Brazil were collected and subjected to morphological identification using male genitalia and also using molecular identification with species-specific primers designed for clear recognition of both the species. The primers were designed for the specific amplification of a gene fragment of the cytochrome oxidase subunit I, which exhibited high specificity during our preliminary experiments with insects from six populations of known species (either S. zeamais or S. oryzae). Both identification strategies provided the same results indicating prevalence of the maize weevil S. zeamais throughout the country. Two hypotheses may explain such prevalence: (i) the likely host preference of S. zeamais for maize because this is the most cultivated cereal in Brazil, and (ii) the prevalence of S. zeamais in tropical regions as compared with S. oryzae, which is more disseminated in subtropical and temperate regions.

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“…No caso do milho, o caruncho Sitophilus zeamais Motschuísky, uma das pragas que ocorrem com maior intensidade (ROSSETTO, 1969), chega, inclusive, a afetar o valor nutricional quando a perda de peso é muito elevada Vários programas de pesquisa visando ao controle do ataque de insetos, em milho (Zea mays l_), vêm sendo desenvolvidos no Brasil. A criação de cultivares resistentes, por exemplo, resultou em sucesso considerável; entretanto, grandes perdas ainda são resultantes do ataque de insetos.…”

Section: Introductionunclassified

Amostragem para estudos de resistência de milho a Sitophilus zeamais motschulsky

Nagai

Gomes²,

Rossetto

et al. 1986

Bragantia

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Neste trabalho, determinou-se o tamanho da amostra para estudos de danos causados pelo caruncho Sitophilus zeamais Motschulsky, avaliados pelos métodos da escala visual de notas e do número de grãos danificados em relação ao total de grãos. O critério adotado para estimar o tamanho da amostra foi de que esse tamanho permitisse detectar uma diferença de 10 ou de 20% da média geral entre médias de danos, em cultivares de milho, e avaliar o dano médio por cultivar com um erro-padrão de 10 ou de 20% da média. Discutiu-se, também, a eficiência dos dois métodos para avaliar o dano causado pelo caruncho. Foram utilizados dados de dois experimentos de laboratório, conduzidos nos anos agrícolas de 1978/79 a 1979/80, realizado no Instituto Agronômico, Campinas. O delineamento experimental foi de blocos casualizados com 10 repetições, sendo as parcelas formadas por cinco linhas de dez espigas. Os tratamentos estudados foram um cultivar resistente, Asteca Prolífico VRPE VII, um suscetível, o híbrido duplo IAC Hmd 7974, e os cultivares IAC Maya XVI e o híbrido simples HS 7777. Para definir o processo de amostragem, utilizou-se o método de componentes de variância. O tamanho da amostra foi bastante variável entre cultivares, sendo maior no cultivar resistente e, entre métodos de avaliação, maior no método de Davis. Entre os possíveis tamanhos de amostra para detectar uma diferença de 10% da média entre médias de danos de tratamentos, podem ser utilizados: seis blocos com seis linhas de dez espigas por linha, no método de Wiseman, e dez blocos com seis espigas, no método de Davis. Para diferença de 20% da média geral, podem ser empregados: seis blocos com duas linhas de sete espigas, no método de Wiseman, e seis blocos de uma linha de dez espigas, no método de Davis. Para estimar a média de dano por cultivar com erro-padrão equivalente a 0,10 y, os tamanhos de amostra indicados são os seguintes: (a) nas avaliações, pelo método de Wiseman, 270 espigas no 'Asteca' e 70 espigas nos cultivares Hmd 7974, HS 7777 e Maya; (b) nas avaliações pelo método de Davis, 450 espigas no 'Asteca' e cerca de 300 espigas nos demais. Para uma precisão menor, ou seja, erro-padrão de 0,20 y, pode-se estimar a média a partir dos seguintes tamanhos de amostra: (a) nas avaliações pelo método de Wiseman, cinco blocos com duas linhas de seis espigas, no 'Asteca', e cinco blocos com duas linhas de três espigas, nos demais cultivares; (b) nas avaliações pelo método de Davis, cinco blocos com três linhas de seis espigas, no 'Asteca', e cinco blocos com duas linhas de cinco espigas nos restantes.

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O complexo de Sitophilus spp (Coleoptera Curculionidae) no Estado de São Paulo

Cited by 18 publications

References 8 publications

Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides

Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides

Distribution of the related weevil species Sitophilus oryzae and S. zeamais in Brazil

Amostragem para estudos de resistência de milho a Sitophilus zeamais motschulsky

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