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BACKGROUND: This study explored the impact of Leucothyreus femoratus, a previously unreported folivorous pest in cacao cultivation, on cacao tree survival, development, and yield. The study was conducted in an experimental cacao plot in the Colombian plains, it featured 20 cacao genotypes in an agroforestry system, with plantain and Mexican sunflower providing temporary shade, and yopo offering permanent shade. RESULTS: We found an infestation rate of 2.9 ± 0.3 adult beetles per cacao tree. L. femoratus larvae were discovered in association with the roots of all plants within the agroforestry arrangement; however, yopo and plantain exhibited the highest incidence of root-feeding larvae among these associated plants. Interestingly, male and female L. femoratus displayed distinct leaf consumption patterns in the laboratory, with females consuming more foliage relative to their body weight. Moreover, field observations highlighted the detrimental impact of L. femoratus herbivory on cacao tree survival and growth, leading to leaf skeletonization, reduced plant height, and stem diameter. Trees with over 50% leaf consumption suffered more than 20% mortality. Additionally, herbivory negatively affected cacao yield, correlating higher leaf surface damage with a decrease in harvested pods. The study also identified varying antixenotic resistance in different cacao genotypes, with some consistently displaying resistance while others showed variable levels during tree establishment and production stages. CONCLUSION: This research underscores the significant role of L. femoratus as a cacao pest, emphasizing its adverse effects on cacao tree survival, development, and yield. Consequently, implementing effective control measures is vital for ensuring sustainable cacao cultivation. © 2023 Society of Chemical Industry.

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An increase in Spodoptera species was reported in Bt soybean fields expressing Cry1Ac insecticidal proteins in Brazil, requiring additional management with chemical insecticides. Here, we evaluated the dose effects of flubendiamide and thiodicarb on Spodoptera cosmioides (Walker, 1858), Spodoptera eridania (Stoll, 1782), Spodoptera albula (Walker, 1857) and Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) that survived on MON 87751 × MON 87708 × MON 87701 × MON 89788, expressing Cry1A.105, Cry2Ab2 and Cry1Ac; MON 87701 × MON 89788 soybean, expressing Cry1Ac; and non-Bt soybean. On unsprayed Cry1A.105/Cry2Ab2/Cry1Ac soybean, only S. frugiperda showed ~60% mortality after 10 d, whereas S. cosmioides, S. eridania and S. albula showed >81% mortality. The surviving larvae of all species on this Bt soybean showed >80% mortality when exposed to the field label dose of flubendiamide (70 mL/ha) or thiodicarb (400 g/ha) or at 50% of these doses. In contrast, all four species had <25% and <19% mortality on Cry1Ac and non-Bt soybean, respectively. The surviving S. cosmioides, S. eridania and S. albula on these soybean types presented >83% mortality after exposure to both dose levels of flubendiamide and thiodicarb. Some S. frugiperda larvae surviving on Cry1Ac and non-Bt soybean sprayed with a 50% dose of either insecticide developed into adults. However, the L1 larvae developing on Cry1Ac soybean leaves sprayed with flubendiamide and the L2 larvae on this soybean sprayed with thiodicarb had a prolonged immature stage, and the females displayed lower fecundity, which are likely to impact S. frugiperda population growth on soybean.

RESUMO

BACKGROUND: MON 87701 × MON 89788 × MON 87751 × MON 87708 soybean, that expresses Cry1A.105, Cry2Ab2, and Cry1Ac insecticidal proteins and confers tolerance to glyphosate and dicamba, is a potential tool for managing Spodoptera species in soybean fields in Brazil. In this study, we characterized the lethal and sub-lethal effects of Cry1A.105/Cry2Ab2/Cry1Ac soybean against Spodoptera species and genotypes of Spodoptera frugiperda resistant and susceptible to Cry1 and Cry2 proteins. These evaluations were also conducted with MON 87701 × MON 89788 soybean, which expresses Cry1Ac protein. RESULTS: Cry1A.105/Cry2Ab2/Cry1Ac soybean caused high lethality in neonates of Spodoptera cosmioides and Spodoptera albula. However, it showed low lethality in S. frugiperda genotypes homozygous for resistance to Cry1 and Cry2 proteins but reduced their population growth potential. No relevant lethal effects of Cry1Ac soybean were detected in the Spodoptera species and genotypes evaluated. Spodoptera frugiperda genotypes heterozygous for Cry1 and Cry2 resistance were controlled by Cry1A.105/Cry2Ab2/Cry1Ac soybean, with no insects developing into adults. This Bt soybean also caused intermediate mortality of neonates of Spodoptera eridania (60%-83%) but no surviving larvae developed to adulthood, resulting in population suppression. CONCLUSIONS: Cry1A.105/Cry2Ab2/Cry1Ac soybean caused high mortality of S. cosmioides, S. albula, and S. frugiperda genotypes susceptible to Cry1 and Cry2 and heterozygous for Cry1 and Cry2 resistance. This Bt soybean also suppressed population growth of S. eridania but had minimal impact on S. frugiperda homozygous for resistance to Cry1 and Cry2 proteins. Cry1Ac soybean had minimal impact on all Spodoptera species and genotypes evaluated. © 2022 Society of Chemical Industry.

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Pachira aquatica (Malvaceae), known as munguba, is cultivated for afforestation of many Brazilian cities. In Seropédica campus of UFRRJ, it was observed the defoliation of one specimen of Pachira aquatica with presence of larvae, pre-pupae, and pupae of beetle of the subfamily Hyperinae, which were reared in laboratory until the emergence of the adults; these insects were identified as belonging to the species Phelypera griseofasciata Capiomont (Coleoptera: Curculionidae). These immature forms (n=86) were again collected in this same specimen and reared in laboratory to verify the occurrence of parasitism. It was obtained 128 adults of Jaliscoa nudipennis Boucek (Hymenoptera: Pteromalidae), responsible for 44.2% of total parasitism. The sex ratio was 0.70, so the highest number of offspring was of females. Intersexual and intrasexual dimorphisms were also observed in J. nudipennis regarding the shape of the head and characteristics of the wings. This study is the first record of both insect species associated with Pachira aquatica in the state of Rio de Janeiro, Brazil.(AU)

Pachira aquatica (Malvaceae), conhecida como munguba, é cultivada para arborização de muitas cidades brasileiras. No campus de Seropédica da UFRRJ, observou-se o desfolhamento de um espécime de Pachira aquatica, com a presença de larvas, pré-pupas e pupas de besouro da subfamília Hyperinae, que foram criadas em laboratório até a emergência dos adultos; esses insetos foram identificados como pertencentes à espécie Phelypera griseofasciata Capiomont (Coleoptera: Curculionidae). Essas formas imaturas (n=86) foram novamente coletadas nesse mesmo espécime e criadas em laboratório para verificar a ocorrência de parasitismo. Foram obtidos 128 adultos de Jaliscoa nudipennis Boucek (Hymenoptera: Pteromalidae), responsáveis por 44,2% do parasitismo total. A razão sexual foi de 0,70, portanto, o maior número de descendentes foi de fêmeas. Observaram-se ainda os dimorfismos inter e intrasexuais em J. nudipennis quanto ao formato da cabeça e às características das asas. Este estudo trata-se do primeiro registro de ambas as espécies de insetos associadas a Pachira aquatica no estado do Rio de Janeiro, Brasil.(AU)

Assuntos

RESUMO

Pachira aquatica (Malvaceae), known as munguba, is cultivated for afforestation of many Brazilian cities. In Seropédica campus of UFRRJ, it was observed the defoliation of one specimen of Pachira aquatica with presence of larvae, pre-pupae, and pupae of beetle of the subfamily Hyperinae, which were reared in laboratory until the emergence of the adults; these insects were identified as belonging to the species Phelypera griseofasciata Capiomont (Coleoptera: Curculionidae). These immature forms (n=86) were again collected in this same specimen and reared in laboratory to verify the occurrence of parasitism. It was obtained 128 adults of Jaliscoa nudipennis Boucek (Hymenoptera: Pteromalidae), responsible for 44.2% of total parasitism. The sex ratio was 0.70, so the highest number of offspring was of females. Intersexual and intrasexual dimorphisms were also observed in J. nudipennis regarding the shape of the head and characteristics of the wings. This study is the first record of both insect species associated with Pachira aquatica in the state of Rio de Janeiro, Brazil.(AU)

Pachira aquatica (Malvaceae), conhecida como munguba, é cultivada para arborização de muitas cidades brasileiras. No campus de Seropédica da UFRRJ, observou-se o desfolhamento de um espécime de Pachira aquatica, com a presença de larvas, pré-pupas e pupas de besouro da subfamília Hyperinae, que foram criadas em laboratório até a emergência dos adultos; esses insetos foram identificados como pertencentes à espécie Phelypera griseofasciata Capiomont (Coleoptera: Curculionidae). Essas formas imaturas (n=86) foram novamente coletadas nesse mesmo espécime e criadas em laboratório para verificar a ocorrência de parasitismo. Foram obtidos 128 adultos de Jaliscoa nudipennis Boucek (Hymenoptera: Pteromalidae), responsáveis por 44,2% do parasitismo total. A razão sexual foi de 0,70, portanto, o maior número de descendentes foi de fêmeas. Observaram-se ainda os dimorfismos inter e intrasexuais em J. nudipennis quanto ao formato da cabeça e às características das asas. Este estudo trata-se do primeiro registro de ambas as espécies de insetos associadas a Pachira aquatica no estado do Rio de Janeiro, Brasil.(AU)

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This study validated the use of leaf 17 on the sampling of Opsiphanes invirae Hübner (Lepidoptera: Nymphalidae) through the quantification of caterpillar abundance on the different spirals leaves, in comparison to leaf 17, and, on the apical, intermediate and basal leaf regions. This study was performed in the state of Pará, between March-2014 and March-2015. Results confirmed that leaf 17 is the most adequate method for monitoring this defoliator pest.(AU)

Esta pesquisa validou a utilização da folha 17, nas amostragens de Opsiphanes invirae Hübner )Lepidoptera: Nymphalidae), através da quantificação da abundância de lagartas nas diferentes folhas que compõem os espirais em comparação com a folha 17, e, em diferentes regiões da folha (apical, intermediária e basal). O estudo foi realizado no Pará entre março de 2014 e março de 2015. Os resultados confirmam que a folha 17 é a mais adequada para ser utilizada no monitoramento desse desfolhador.(AU)

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Costalimaita ferruginea (Coleoptera: Chrysomelidae) attacks Eucalyptus plants causing severe damage through netting of the leaves. Recently, this Coleoptera has been reported attacking Myrtaceae in Mato Grosso State and, studies about the occurrence of this beetle in commercial plantations of eucalypts has been the subject of researchers through monitoring programmes in the forest protection area. With the beginning of the rainy season, adults were observed causing damage in eucalypt plantations in four cities that are part of the transition region of Amazon and Cerrado Biomes. The spots where these insects were observed are located in Feliz Natal, Lucas do Rio Verde, Sorriso and Vera. The purpose of this study was to report the new occurrences and to characterize the attack period of the beetle C. ferruginea in Eucalyptus plantations in Middle-North region of Mato Grosso State, region of Biomes Transition.(AU)

Costalimaita ferruginea (Coleoptera: Chrysomelidae) ataca plantas de Eucalyptus provocando intensos danos através do rendilhamento das folhas. Recentemente, esse Coleoptera tem sido relado atacando Myrtaceae no Estado de Mato Grosso e, estudos sobre a ocorrência desse besouro em plantios comerciais de eucaliptos tem sido alvo de pesquisadores através de programas de monitoramento na área de proteção florestal. Com o início do período chuvoso, adultos foram observados causando danos em plantios de eucalipto em quatro municípios que fazem parte da região de transição dos Biomas Amazônia e Cerrado. Os pontos onde foram observados esses insetos estão localizados em Feliz Natal, Lucas do Rio Verde, Sorriso e Vera. O objetivo deste trabalho foi relatar as novas ocorrências e caracterizar o período de ataque do besouro C. ferruginea em plantios de Eucalyptus na região Médio-Norte do Estado de Mato Grosso, região de transição de Biomas.(AU)

Assuntos

RESUMO

Abstract Costalimaita ferruginea (Coleoptera: Chrysomelidae) attacks Eucalyptus plants causing severe damage through netting of the leaves. Recently, this Coleoptera has been reported attacking Myrtaceae in Mato Grosso State and, studies about the occurrence of this beetle in commercial plantations of eucalypts has been the subject of researchers through monitoring programmes in the forest protection area. With the beginning of the rainy season, adults were observed causing damage in eucalypt plantations in four cities that are part of the transition region of Amazon and Cerrado Biomes. The spots where these insects were observed are located in Feliz Natal, Lucas do Rio Verde, Sorriso and Vera. The purpose of this study was to report the new occurrences and to characterize the attack period of the beetle C. ferruginea in Eucalyptus plantations in Middle-North region of Mato Grosso State, region of Biomes Transition.

Resumo Costalimaita ferruginea (Coleoptera: Chrysomelidae) ataca plantas de Eucalyptus provocando intensos danos através do rendilhamento das folhas. Recentemente, esse Coleoptera tem sido relado atacando Myrtaceae no Estado de Mato Grosso e, estudos sobre a ocorrência desse besouro em plantios comerciais de eucaliptos tem sido alvo de pesquisadores através de programas de monitoramento na área de proteção florestal. Com o início do período chuvoso, adultos foram observados causando danos em plantios de eucalipto em quatro municípios que fazem parte da região de transição dos Biomas Amazônia e Cerrado. Os pontos onde foram observados esses insetos estão localizados em Feliz Natal, Lucas do Rio Verde, Sorriso e Vera. O objetivo deste trabalho foi relatar as novas ocorrências e caracterizar o período de ataque do besouro C. ferruginea em plantios de Eucalyptus na região Médio-Norte do Estado de Mato Grosso, região de transição de Biomas.

Assuntos

RESUMO

Abstract Costalimaita ferruginea (Coleoptera: Chrysomelidae) attacks Eucalyptus plants causing severe damage through netting of the leaves. Recently, this Coleoptera has been reported attacking Myrtaceae in Mato Grosso State and, studies about the occurrence of this beetle in commercial plantations of eucalypts has been the subject of researchers through monitoring programmes in the forest protection area. With the beginning of the rainy season, adults were observed causing damage in eucalypt plantations in four cities that are part of the transition region of Amazon and Cerrado Biomes. The spots where these insects were observed are located in Feliz Natal, Lucas do Rio Verde, Sorriso and Vera. The purpose of this study was to report the new occurrences and to characterize the attack period of the beetle C. ferruginea in Eucalyptus plantations in Middle-North region of Mato Grosso State, region of Biomes Transition.

Resumo Costalimaita ferruginea (Coleoptera: Chrysomelidae) ataca plantas de Eucalyptus provocando intensos danos através do rendilhamento das folhas. Recentemente, esse Coleoptera tem sido relado atacando Myrtaceae no Estado de Mato Grosso e, estudos sobre a ocorrência desse besouro em plantios comerciais de eucaliptos tem sido alvo de pesquisadores através de programas de monitoramento na área de proteção florestal. Com o início do período chuvoso, adultos foram observados causando danos em plantios de eucalipto em quatro municípios que fazem parte da região de transição dos Biomas Amazônia e Cerrado. Os pontos onde foram observados esses insetos estão localizados em Feliz Natal, Lucas do Rio Verde, Sorriso e Vera. O objetivo deste trabalho foi relatar as novas ocorrências e caracterizar o período de ataque do besouro C. ferruginea em plantios de Eucalyptus na região Médio-Norte do Estado de Mato Grosso, região de transição de Biomas.

RESUMO

Abstract Costalimaita ferruginea (Coleoptera: Chrysomelidae) attacks Eucalyptus plants causing severe damage through netting of the leaves. Recently, this Coleoptera has been reported attacking Myrtaceae in Mato Grosso State and, studies about the occurrence of this beetle in commercial plantations of eucalypts has been the subject of researchers through monitoring programmes in the forest protection area. With the beginning of the rainy season, adults were observed causing damage in eucalypt plantations in four cities that are part of the transition region of Amazon and Cerrado Biomes. The spots where these insects were observed are located in Feliz Natal, Lucas do Rio Verde, Sorriso and Vera. The purpose of this study was to report the new occurrences and to characterize the attack period of the beetle C. ferruginea in Eucalyptus plantations in Middle-North region of Mato Grosso State, region of Biomes Transition.

Resumo Costalimaita ferruginea (Coleoptera: Chrysomelidae) ataca plantas de Eucalyptus provocando intensos danos através do rendilhamento das folhas. Recentemente, esse Coleoptera tem sido relado atacando Myrtaceae no Estado de Mato Grosso e, estudos sobre a ocorrência desse besouro em plantios comerciais de eucaliptos tem sido alvo de pesquisadores através de programas de monitoramento na área de proteção florestal. Com o início do período chuvoso, adultos foram observados causando danos em plantios de eucalipto em quatro municípios que fazem parte da região de transição dos Biomas Amazônia e Cerrado. Os pontos onde foram observados esses insetos estão localizados em Feliz Natal, Lucas do Rio Verde, Sorriso e Vera. O objetivo deste trabalho foi relatar as novas ocorrências e caracterizar o período de ataque do besouro C. ferruginea em plantios de Eucalyptus na região Médio-Norte do Estado de Mato Grosso, região de transição de Biomas.

RESUMO

ABSTRACT: This study validated the use of leaf 17 on the sampling of Opsiphanes invirae Hübner (Lepidoptera: Nymphalidae) through the quantification of caterpillar abundance on the different spirals leaves, in comparison to leaf 17, and, on the apical, intermediate and basal leaf regions. This study was performed in the state of Pará, between March-2014 and March-2015. Results confirmed that leaf 17 is the most adequate method for monitoring this defoliator pest.

RESUMO: Esta pesquisa validou a utilização da folha 17, nas amostragens de Opsiphanes invirae Hübner )Lepidoptera: Nymphalidae), através da quantificação da abundância de lagartas nas diferentes folhas que compõem os espirais em comparação com a folha 17, e, em diferentes regiões da folha (apical, intermediária e basal). O estudo foi realizado no Pará entre março de 2014 e março de 2015. Os resultados confirmam que a folha 17 é a mais adequada para ser utilizada no monitoramento desse desfolhador.

RESUMO

Abstract Costalimaita ferruginea (Coleoptera: Chrysomelidae) attacks Eucalyptus plants causing severe damage through netting of the leaves. Recently, this Coleoptera has been reported attacking Myrtaceae in Mato Grosso State and, studies about the occurrence of this beetle in commercial plantations of eucalypts has been the subject of researchers through monitoring programmes in the forest protection area. With the beginning of the rainy season, adults were observed causing damage in eucalypt plantations in four cities that are part of the transition region of Amazon and Cerrado Biomes. The spots where these insects were observed are located in Feliz Natal, Lucas do Rio Verde, Sorriso and Vera. The purpose of this study was to report the new occurrences and to characterize the attack period of the beetle C. ferruginea in Eucalyptus plantations in Middle-North region of Mato Grosso State, region of Biomes Transition.

Resumo Costalimaita ferruginea (Coleoptera: Chrysomelidae) ataca plantas de Eucalyptus provocando intensos danos através do rendilhamento das folhas. Recentemente, esse Coleoptera tem sido relado atacando Myrtaceae no Estado de Mato Grosso e, estudos sobre a ocorrência desse besouro em plantios comerciais de eucaliptos tem sido alvo de pesquisadores através de programas de monitoramento na área de proteção florestal. Com o início do período chuvoso, adultos foram observados causando danos em plantios de eucalipto em quatro municípios que fazem parte da região de transição dos Biomas Amazônia e Cerrado. Os pontos onde foram observados esses insetos estão localizados em Feliz Natal, Lucas do Rio Verde, Sorriso e Vera. O objetivo deste trabalho foi relatar as novas ocorrências e caracterizar o período de ataque do besouro C. ferruginea em plantios de Eucalyptus na região Médio-Norte do Estado de Mato Grosso, região de transição de Biomas.

RESUMO

Abstract Costalimaita ferruginea (Coleoptera: Chrysomelidae) attacks Eucalyptus plants causing severe damage through netting of the leaves. Recently, this Coleoptera has been reported attacking Myrtaceae in Mato Grosso State and, studies about the occurrence of this beetle in commercial plantations of eucalypts has been the subject of researchers through monitoring programmes in the forest protection area. With the beginning of the rainy season, adults were observed causing damage in eucalypt plantations in four cities that are part of the transition region of Amazon and Cerrado Biomes. The spots where these insects were observed are located in Feliz Natal, Lucas do Rio Verde, Sorriso and Vera. The purpose of this study was to report the new occurrences and to characterize the attack period of the beetle C. ferruginea in Eucalyptus plantations in Middle-North region of Mato Grosso State, region of Biomes Transition.

Resumo Costalimaita ferruginea (Coleoptera: Chrysomelidae) ataca plantas de Eucalyptus provocando intensos danos através do rendilhamento das folhas. Recentemente, esse Coleoptera tem sido relado atacando Myrtaceae no Estado de Mato Grosso e, estudos sobre a ocorrência desse besouro em plantios comerciais de eucaliptos tem sido alvo de pesquisadores através de programas de monitoramento na área de proteção florestal. Com o início do período chuvoso, adultos foram observados causando danos em plantios de eucalipto em quatro municípios que fazem parte da região de transição dos Biomas Amazônia e Cerrado. Os pontos onde foram observados esses insetos estão localizados em Feliz Natal, Lucas do Rio Verde, Sorriso e Vera. O objetivo deste trabalho foi relatar as novas ocorrências e caracterizar o período de ataque do besouro C. ferruginea em plantios de Eucalyptus na região Médio-Norte do Estado de Mato Grosso, região de transição de Biomas.

RESUMO

Anticarsia gemmatalis was treated with aromatic and medicinal plant extracts from Cerrado biome: Acisanthera sp., Adenocalymma nodosum, Bidens sulphurea, Lepidoploa aurea, Dimorphandra mollis, and Salvertia convallariaeodora. Extracts of astilbin from D. mollis or L. aurea were the most toxic to eggs and have reduced the sex ratio of A. gemmatalis pupae. Extracts of B. sulphurea, astilbin from D. mollis or S. convallariaeodora reduced the weight of male pupae and those of astilbin from D. mollis, the weight of female pupae of A. gemmatalis. The viability of the stages from egg to caterpillar was lower with extracts of astilbin from D. mollis or L. aurea; from caterpillar to pupa with Acisanthera sp. or astilbin from D. mollis and from pupa to adult with Acisanthera sp., A. nodosum, B. sulphurea or astilbin from D. mollis. Extracts of astilbin from D. mollis and L. aurea presented greater potential for future studies on toxicity of A. gemmatalis.

Anticarsia gemmatalis fue tratada con extractos de plantas aromáticas y medicinales del bioma Cerrado: Acisanthera sp., Adenocalymma nodosum, Bidens sulphurea, Lepidoploa aurea, Dimorphandra mollis, y Salvertia convallariaeodora. Extractos de astilbin de D. mollis o L. aurea fueron los más tóxicos para los huevos y han reducido la proporción sexual de pupas de A. gemmatalis. Extractos de B. sulphurea, astilbin de D. mollis o S. convallariaeodora redujeron el peso de las pupas macho y el de astilbin de D. mollis, el peso de las pupas hembras de A. gemmatalis. La viabilidad de los estadíos de huevo a oruga fue menor con extractos de astilbin de D. mollis o L. aurea; de oruga a crisálida con Acisanthera sp. o astilbin de D. mollis y de pupa a adulto con Acisanthera sp., A. nodosum, B. sulphurea o astilbin de D. mollis. Extractos de astilbin de D. mollis y L. aurea presentan un mayor potencial para futuros estudios sobre la toxicidad sobre A. gemmatalis.

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Este trabalho objetivou relatar o ataque de lagartas desfolhadoras de eucalipto no Estado do Rio Grande do Sul. A espécie foi determinada como sendo Nystalea nyseus (CRAMER, 1775) (Lepidoptera: Notodontidae). As lagartas dessa espécie causam desfolhamento em árvores de eucalipto. Este é o primeiro registro de Nystalea nyseus em árvores de eucalipto no Estado.

This research aimed to record the damage caused by Eucalyptus-defoliating caterpillars located in Rio Grande do Sul States, Brazil. The specie was determined as Nystalea nyseus (CRAMER, 1775) (Lepidoptera: Notodontidae). The caterpillars of this species cause defoliation in Eucalyptus trees. This is the first record of Nystalea nyseus from Eucalyptus plantation in the Rio Grande do Sul State, Brazil.

RESUMO

This research aimed to record the damage caused by Eucalyptus-defoliating caterpillars located in Rio Grande do Sul States, Brazil. The specie was determined as Nystalea nyseus (CRAMER, 1775) (Lepidoptera: Notodontidae). The caterpillars of this species cause defoliation in Eucalyptus trees. This is the first record of Nystalea nyseus from Eucalyptus plantation in the Rio Grande do Sul State, Brazil.

Este trabalho objetivou relatar o ataque de lagartas desfolhadoras de eucalipto no Estado do Rio Grande do Sul. A espécie foi determinada como sendo Nystalea nyseus (CRAMER, 1775) (Lepidoptera: Notodontidae). As lagartas dessa espécie causam desfolhamento em árvores de eucalipto. Este é o primeiro registro de Nystalea nyseus em árvores de eucalipto no Estado.

RESUMO

This research aimed to record the damage caused by Eucalyptus-defoliating caterpillars located in Rio Grande do Sul States, Brazil. The specie was determined as Nystalea nyseus (CRAMER, 1775) (Lepidoptera: Notodontidae). The caterpillars of this species cause defoliation in Eucalyptus trees. This is the first record of Nystalea nyseus from Eucalyptus plantation in the Rio Grande do Sul State, Brazil.

Este trabalho objetivou relatar o ataque de lagartas desfolhadoras de eucalipto no Estado do Rio Grande do Sul. A espécie foi determinada como sendo Nystalea nyseus (CRAMER, 1775) (Lepidoptera: Notodontidae). As lagartas dessa espécie causam desfolhamento em árvores de eucalipto. Este é o primeiro registro de Nystalea nyseus em árvores de eucalipto no Estado.

RESUMO

O conhecimento da dinâmica populacional e da distribuição espacial de insetos pragas em culturas hospedeiras é fundamental para a determinação de medidas adequadas de controle. Diabrotica speciosa Germar, 1824 é uma praga polifaga que reduz a produtividade do tabaco, através do consumo da área foliar na alimentação. Objetivou-se com este estudo analisar a flutuação populacional e a distribuição espacial de Diabrotica speciosa (Coleoptera: Chrysomelidae) na cultura do tabaco, avaliando o impacto da vegetação adjacente á lavoura. A pesquisa foi conduzida em uma lavoura de tabaco orgânico no município de Santa Cruz doSul, Rio Grande do Sul, durante a safra de 2009/2010, utilizando-se de armadilhasde Malaise. Foi coletado um total de 3 217 indivíduos adultos de Diabroticaspeciosa, com 85,8% dos espécimes amostrados nos meses de dezembro e janeiroe com a maior abundância no interior do cultivo, sendo a disponibilidade defolhas de tabaco para a alimentação o parâmetro mais determinante na ocorrênciada espécie no plantio.

Knowledge of population dynamics and spatial distribution of insect pests Knowledge of population dynamics and spatial distribution of insect pests on host crops is essential to determine of appropriate control measures. Diabrotica speciosa Germar, 1824 is a polyphagous pest that reduces the productivity of tobacco, through consumption of leaf area in the feed. The objective of this study was to analyze the population fluctuation and spatial distribution of Diabrotica speciosa (Coleoptera: Chrysomelidae) in tobacco growing, evaluating the impact of vegetation adjacent to plantation. The research was conducted in an organic crop of tobacco in Santa Cruz do Sul, Rio Grande do Sul, Brazil, during the growing season of 2009/2010, using Malaise traps. We collected a total of 3,217 adults of Diabrotica speciosa, with 85.8% of specimens sampled in the months of December and January and with the highest abundance in the interior of the culture, and the availability of tobacco leaves to feed the most crucial parameter in the occurrence of the species in planting.

Assuntos

RESUMO

The aim of this study was to evaluate the development and reproduction of P. nigrispinus in laboratory when fed with T. arnobia reared on guava leaves. This predator showed nymphal stage of 21.11 days, survival of 60 percent and periods of pre-oviposition, number of eggs/mass and eggs/female and egg viability of 6.10 days, 26.24 eggs, 314.90 eggs and 82.65 percent, respectively. These results demonstrated that T. arnobia fed with guava leaves was an adequate supply of food to P.nigrispinus.

RESUMO

The oil palm Elaeis guineensis is usually attacked by pests, particularly, defoliating caterpillars. Between 2004 and 2006 a stinkbug predator (Asopinae) was registered preying on caterpillars of Brassolis sophorae L., Opsiphanes invirae Hübner (Lepidoptera: Nymphalidae) and Sibine spp. (Lepidoptera: Limacodidae), reducing their populations in commercial oil palm plantations in the State of Pará, Brazil. Specimens of the natural enemy were collected, mounted, and identified as Alcaeorrhynchus grandis (Dallas) (Hemiptera: Pentatomidae), corresponding to the first report of the occurrence of this stinkbug attacking defoliating caterpillars of oil palm in Brazil.

Assuntos