ABSTRACT. Occurrence and population fluctuation of Chrysopidae (Neuroptera) on Pinus taeda (L.) (Pinaceae) in Southern Paraná. The lacewings are very voracious predators of aphids. The objective of this research was to evaluate the occurrence of adult chrysopids in areas of Pinus reforestation where the giant conifer aphid Cinara spp. (Hemiptera: Aphididae) is causing severe damages. A total of 47 specimens were collected during one year and identified as: Chrysoperla externa (Hagen, 1861), Leucochrysa (Nodita) intermedia (Scheneir, 1851) and Leucochrysa (Nodita) vieirana (Navás, 1913). The captures in the area where the plants were one year old represented about 75% of the adults probably due to the high Cinara infestation on the trees in this area. The chrysopids were recorded mostly during the summer, possibly influenced by temperature.
Pineus boerneri Annand, 1928 (Hemiptera, Adelgidae) _ a new species to Brazil: morphology of eggs, nymphs and adults. Pineus boerneri represents the first Adelgidae species recorded in Brazil. This aphid species forms extensive colonies on branches and trunk of Pinus spp., with apterous oviparous females, eggs and nymphs covered with white wax. The aim of this research is to study the morphology of eggs, nymphs, and adults to provide useful data for species identification in order to solve taxonomic issues. The study was based on morphometric data and optical and scanning electron microscopy images. First instar nymphs are active and can be easily distinguished from the others by their elongate minute yellowish body; well developed legs bearing a pair of sensorial setae at the apex of the second tarsomere; and antenna with three segments with a large rhinarium and distinct apical setae on the last segment. From the second to the fourth instar, nymphs are sessile, with round red body; they loose the third antennal segment and its sensorial structures, as well as the setae on the second tarsomere. The oviparous female is reddish-brown, with round body with about 0.76 mm diameter; legs reduced; antennae one-segmented; ovipositor distinct; numerous wax glands are present, mainly on the head. Accurate characterization of the species and distinction of the nymphal instars of P. boerneri were made possible by canonical analysis of morphometric data and morphological characters.
Pineus boerneri Annand, 1928 (Hemiptera, Adelgidae) _ uma espécie nova para o Brasil: morfologia de ovos, ninfas e adultos. Pineus boerneri representa a primeira espécie de Adelgidae registrada no Brasil. Esta espécie de Adelgidae forma densas colônias em ramos e tronco de Pinus spp., com fêmeas ovíparas ápteras, ovos e ninfas recobertos por lanugem branca. A presente pesquisa teve como objetivo estudar a morfologia de ovos, ninfas e de fêmeas adultas, visando à identificação correta da espécie, para solucionar problemas taxonômicos. O estudo das formas baseou-se na morfometria e microscopia ótica e eletrônica de varredura. As ninfas de primeiro instar são ativas, de coloração amarelada, diferenciadas das demais pelo formato alongado do corpo; pernas bem desenvolvidas com um par de cerdas sensoriais no ápice do segundo segmento tarsal; antenas com três segmentos, com um rinário e cerdas apicais bem distintas. A partir do segundo instar, as ninfas são sésseis, apresentam corpo arredondado de coloração avermelhada, perdem o terceiro segmento antenal e as cerdas e estruturas sensoriais do segundo segmento tarsal. As fêmeas adultas são marrom-avermelhadas, apresentam corpo arredondado, com aproximadamente 0,76 mm de diâmetro; pernas reduzidas; um único segmento antenal bem reduzido; ovipositor distinto; e numerosas glândulas de cera, principalmente, na região da cabeça. A caracterização da espécie e distinção dos ínstares é possível pela análise canônica dos dados morfométricos e caracteres morfológicos
ResumoAs formigas cortadeiras pertencentes ao gênero Acromyrmex (Hymenoptera: Formicidae), representam um dos principais problemas do empreendimento florestal no Brasil. Estudos objetivando determinar a ocorrência e os danos causados por essas formigas em áreas de plantio de Pinus na região Sul do Brasil são escassos. Os principais objetivos desta pesquisa foram a determinação da densidade de ninhos em áreas de plantio de Pinus taeda L. com e sem controle químico e a quantificação de plantas atacadas. Os estudos foram conduzidos no período de janeiro a junho de 2010. O experimento foi instalado em uma fazenda situada no município de Anita Garibaldi (SC). Foram demarcadas quatro parcelas de 0,5 ha, sendo que duas receberam um combate pré-plantio com isca formicida e duas não. Após o plantio, foram realizados censos quinzenais em cada parcela. Constatou-se a ocorrência de formigas das espécies Acromyrmex crassispinus Forel 1909 e Acromyrmex heyeri Forel 1899. Os danos totais médios por hectare causados às mudas foram no máximo de 3,0% no 35º dia e de 5,38% no 63o dia de avaliação. Os controles às formigas podem ser diminuídos se forem levados em consideração época do plantio, densidade dos formigueiros e porcentagem de danos causados às mudas.AbstractAssessment of damages caused by leaf-cutting ants of genus Acromyrmex (Hymenoptera: Formicidae) in plantations of Pinus taeda in Santa Catarina southern highlands. Leaf-cutting ants of genus Acromyrmex (Hymenoptera: Formicidae) represent one of the main problems of forest enterprise in Brazil. Researches aiming to determine occurrence and damage caused by such ants in areas of pine plantation in southern Brazil are scarce. The main aims of this research were determining density of nests in Pinus taeda L. planted areas with and without chemical control, and quantification of attacked plants. The research was developed from January to June 2010. The experiment was set up on a farm in the municipality of Anita Garibaldi, SC. Four plots of 0.5 ha were marked out, two received a pre-planting to combat ant bait, and two others not. After planting, censuses had been managed biweekly to each plot. It revealed the occurrence of the following ant species: Acromyrmex crassispinus Forel 1909 and Acromyrmex heyeri Forel 1899. The average total damage caused to seedlings per hectare reached the maximum of 3.0% at the 35th day, and 5.38% at the 63rd day of evaluation. Ants control can be decreased if it is considered planting time, density of nests and seedlings damage percentage.Keywords: Ant; ant bait; chemical control.
Resumo: A Mata Atlântica é o terceiro maior bioma brasileiro e possui uma dasmaiores biodiversidades do mundo. Tem função reguladora do fluxo dos mananciaishídricos, mantém a fertilidade do solo, controla o equilíbrio climático, eevita deslizamentos de escarpas e encostas de regiões serranas. Desde temposcoloniais vem sofrendo os impactos da atividade exploratória e do crescimentopopulacional e urbano, que causaram fragmentação de ecossistemas, perda debiodiversidade e deterioração de recursos naturais. Aproximadamente 8,5% desua cobertura são áreas preservadas com mais de 100 hectares. A conservaçãodesses fragmentos e a recuperação de áreas degradadas são fundamentais paraa manutenção do bioma e da qualidade de vida das populações associadas a ele.Palavras-chave: Bioma Mata Atlântica. Conservação. Biodiversidade.Abstract: The Atlantic Rainforest is the third largest brazilian biome and has oneof the world’s largest biodiversity. It regulates the flow of water sources, keepssoil fertility, controls the climate balance, and avoids the landslide of slopes andhillsides. Since colonial times it has been suffering the impacts of exploitation,population growth and urban expansion, which caused ecosystem fragmentation,biodiversity loss, and deterioration of natural resources. Approximately 8.5% ofits coverage are preserved areas with more than 100 hectares. The conservationof these fragments and the restoration of degraded areas are fundamental tomaitain the biome and the life quality of the peoples associated to it.Keywords: Atlantic Rainforest Biome. Conservation. Biodiversity.
ABSTRACT. The giant conifer aphids Cinara pinivora (Wilson, 1919) and Cinara atlantica (Wilson, 1919) (Hemiptera, Aphididae) have been observed attacking Pinus spp. in Southern and Southeastern Brazil. The coccinellids, on the other hand, were found feeding on these aphids in the field, which can be regarded as potential biological control agents. The biological cycle and mortality rate of larvae of Cycloneda sanguinea (Linnaeus, 1763) and Hippodamia convergens Guérin-Méneville, 1842 (Coleoptera, Coccinellidae) were evaluated using twenty larvae of each predator species fed with nymphs of Cinara. The vials with the insects were kept under 15 ºC, 20 ºC and 25 ºC, with 12h photophase and 70 ± 10% relative humidity. The consumption was evaluated every 24 hours and the nymphs replaced. For C. sanguinea, the egg incubation time was 10.5, 5.0 and 4.0 days; the average larval development period was 33.3, 15.8 and 8.6 days and the larval mortality rate 20%,0% and 15%, respectively at 15 ºC, 20 ºC and 25 ºC. For H. convergens, the larval development time was 41.9, 19.3 and 10.9 days at 15 ºC, 20 ºC and 25 ºC, respectively. The larval mortality rate was 35%, 15% and 0% under the three temperatures. Both species developed adequately when fed nymphs of Cinara, however, C. sanguinea performed better than H. convergens, even at 15 ºC, at which temperature the biological cycles of the coccinellids are prolonged, but the temperature is favorable for the development of Cinara populations in the field.
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