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Search Results: 1 - 10 of 472801 matches for " Freitas Sérgio de "
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Ocorrência de Ungla Navás (Neuroptera, Chrysopidae) no Brasil e descri??o de nova espécie
Freitas, Sérgio de;
Revista Brasileira de Entomologia , 2007, DOI: 10.1590/S0085-56262007000400004
Abstract: the neotropical genus ungla navás, 1914 is recorded for the first time in the brazilian ecosystem. a new species is described from sete lagoas, minas gerais, brazil. a key for the ungla species is added.
Chrysoperla Steinmann, 1964 (Neuroptera, Chrysopidae): descri??o de uma nova espécie do Brasil
Freitas, Sérgio de;
Revista Brasileira de Entomologia , 2003, DOI: 10.1590/S0085-56262003000300004
Abstract: chrysoperla genanigra sp. nov., is described from pau branco, rio grande do norte, brazil. a key to the brazilian species of chrysoperla is added.
Chrysoperla Steinmann, 1964 (Neuroptera, Chrysopidae): descri o de uma nova espécie do Brasil
Freitas Sérgio de
Revista Brasileira de Entomologia , 2003,
Abstract: Chrysoperla genanigra sp. nov., is described from Pau Branco, Rio Grande do Norte, Brazil. A key to the Brazilian species of Chrysoperla is added.
Parasitismo de Erythmelus tingitiphagus (Soares) (Hymenoptera: Mymaridae) em ovos de Leptopharsa heveae Drake & Poor (Hemiptera: Tingidae), em plantios de seringueira (Hevea brasiliensis Müell. Arg.)
Santos, Rodrigo S.;Freitas, Sérgio de;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000500012
Abstract: the rubber tree lace bug, leptopharsa heveae drake & poor occurs in high populations in rubber tree plantations and it is a limiting factor in rubber production due to the loss of photosynthetic tissue. the control of the pest has been made mainly with chemical products, which cause environmental contamination. the alternative would be the use of biological control agents, however, information about l. heveae natural enemies are scarce. the parasitoid erythmelus tingitiphagus (soares) parasitize eggs of the rubber tree lace bug. the aim of this study was to verify the occurrence of e. tingitiphagus in plantations of several rubber tree clones, located in itiquira town, mato grosso state. the plant leaflets of the clones rrim 600, pr 255, gt 1, pb 235 and pb 217 were collected weekly from october 2005 to february 2006. parasitism was recorded during the entire study period. the parasitism rate of l. heveae eggs in the different clones ranged from 16.8 to 20.6%.
Efeito de diferentes dietas sobre o desenvolvimento pós-embrionário de Chrysoperla defreitasi Brooks (Neuroptera: Chrysopidae)
BIAGIONI, ALEXANDRE;FREITAS, SéRGIO DE;
Neotropical Entomology , 2001, DOI: 10.1590/S1519-566X2001000200020
Abstract: the post-embryonic period of the predator chrysoperla defreitasi brooks, fed on eggs of sitotroga cerealella (olivier) and diatrea saccharalis (fabricius) was evaluated under laboratory conditions at 25±2oc temperature, 70±10% ru, and 14h photophase. the chrysopidae eggs were individualized in glass tubes and after eclosion the larvae were fed on the respective preys and maintained under controlled conditions in a climatic chamber. the experimental design used was completely randomized with 150 replications for each diet. the duration of the 1st, 2nd, and 3rd instars as well as of the pupal phase were 3.4, 2.7, 3.5, and 11.9 days, respectively, for the larvae fed on d. saccharalis and 3.6, 2.8, 2.7, and 9.3 days, respectively, when the diet provided was s. cerealella eggs. chrysopidae larvae fed on eggs of d. saccharalis took an average of 21.5 days to complete the post-embryonic development, with 34.0% of adults emerged, while the individuals fed on s. cerealella eggs took 18.4 days in average, with 55.3% of adults emerged. data allowed to conclude that the best diet for post-embryonic development of c. defreitasi are eggs of s. cerealella, since insects fed on that diet had a shorter development period, higher viability of the three larval instars as well as of the pupal stage, producing higher number of adults.
Efeito da escassez de alimento no desenvolvimento pós-embrionário e no potencial reprodutivo de Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae) em laboratório
Angelini, Marina Robles;Freitas, Sérgio de;
Bragantia , 2006, DOI: 10.1590/S0006-87052006000100017
Abstract: the consequences of food shortage on the post-embryonic development and reproductive potential of chrysoperla externa (hagen) in the laboratory were evaluated. first, second, and third instar larvae received only food on the 1.st, 2.nd, or 3.rd day after ecdysis. during the periods that preceded or followed the tests in the corresponding instars, the larvae received one, two, and three feeding units (fu) at every two days for the 1.st, 2.nd, and 3.rd instars, respectively. each fu consisted of a cardstock disc containing sitotroga cerealella eggs (lepidoptera: gelechiidae). daily evaluations included survival in the different instars and in the larval and pupal stages, as well as the pre-oviposition and oviposition periods, plus number and viability of eggs. the results showed that food shortage during the 1st instar could be offset during larval development. however, the larvae must find food in their first 48 hours of age, because survival in that instar gradually decreased in the absence of food, and 100% mortality may occur when the larvae do not feed until 48 hours after hatching. the pre-oviposition and oviposition periods, as well as fecundity, were not influenced by food shortage during the 1stlarval instar. c. externa larvae require a protein-rich diet during the 2.nd and 3.rd instars, since the ingestion of water and sugars alone during these stages caused high larval mortality. however, fecundity and egg viability were not affected by food shortage during the studied instars.
A memória e o valor da síncope: da diferen?a do que ensinam os antigos e os modernos
Freitas, Sérgio Paulo Ribeiro de;
Per Musi , 2010, DOI: 10.1590/S1517-75992010000200011
Abstract: syncopation is a privileged issue in popular music studies that reappears here in a number of considerations that, marked by the bias of knowledge of the old disciplines of counterpoint and harmony, underline the interaction and, especially, the inseparability between metric (division, rhythm, accentuation, prosody, etc.) and pitches (notes, intervals, dissonance-consonance relationship, chords, auxiliary notes, etc.) in a critical analysis of the figures of syncopation. the first part covers up a minimum memory of the art and theory of syncopation in the western erudite tradition, so that, in the second part, it can be noted that, in tacit and subtle manner, residues of this tradition can affect the value judgment in some of the syncopated worlds of popular music today.
Indicadores morfométricos em cabe?as de espécies brasileiras de Chrysoperla (Neuroptera, Chrysopidae)
Freitas, Sérgio de;Morales, Adriana Coletto;
Revista Brasileira de Entomologia , 2009, DOI: 10.1590/S0085-56262009000400001
Abstract: the species c. externa, c. defreitasi, c. raimundoi and c. genanigra (neuroptera, chrysopidae) have great differences in the genitalia. these species were studied morphometrically by the distances between points of the head (eight linear measurements) to better identify them. the results, analyzed by multivariate statistics, showed that it is possible to identify measures that distinguish the individual, although some species are more distinguishable by morphometry. the canonical analysis showed that three of the four species, c. raimundoi, c. genanigra and c. externa, showed no major overlap between them, and their possible discrimination within the group, only c. defreitasi presented a low resolution according to this analysis, being overlapped with c. externa and c. genanigra, however, it is totally broken in c. raimundoi. the measures that contributed most to differentiation are related to the size of the head and especially the length of wrasse on the edge of the head, until the level of the eyes and antenna.
Caracteriza??o morfológica de espécies de Hemerobius Linnaeus, 1758 (Neuroptera, Hemerobiidae) associadas a cultivos de café (Coffea arabica L.), milho (Zea mays L.) e erva-mate (Ilex paraguariensis St. Hill.)
Lara, Rogéria Inês Rosa;Freitas, Sérgio de;
Revista Brasileira de Entomologia , 2003, DOI: 10.1590/S0085-56262003000300011
Abstract: the predators were collected in mate crop in cascavel and s?o mateus do sul, paraná, brazil and some other additional specimens in coffee and maize crops in ribeir?o preto, s?o paulo, brazil. illustrations obtained by sem are given by the first time to the principal structures. three species of hemerobius were identified: h. bolivari banks, 1910; h. domingensis banks, 1941 and h. gaitoi monserrat, 1996. h. domingensis is recorded for the first time to brazil.
Caracteriza??o morfológica de adultos de Nusalala tessellata (Gerstaecker, 1888) (Neuroptera, Hemerobiidae)
Lara, Rogéria Inês Rosa;Freitas, Sérgio de;
Revista Brasileira de Entomologia , 2002, DOI: 10.1590/S0085-56262002000400005
Abstract: morphologic characterization of adult of nusalala tessellata (gerstaecker, 1888) (neuroptera, hemerobiidae). adult of n. tessellata is redescribed based on morphological characters. 533 specimens were collected in s?o paulo state in plantations of citrus (santa rosa de viterbo), soybean (nuporanga), cotton (ribeir?o preto) and corn (ribeir?o preto and jaboticabal). some other additional specimens collected on sorghum bicolor (lavras-mg) and ilex paraguariensis (s?o mateus do sul, cascavel-pr) were also studied. illustrations obtained by sem are given by first time.
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