Otávio Peres Filho

First record of Sinoxylon conigerum Gerstäcker (Coleoptera: Bostrichidae) in Brazil

This is the first register of Sinoxylon conigerum attacking timber of teak (Tectona grandis L.f.), mango tree (Mangifera indica L.) and (Astronium fraxinifolium Schott) in the municipalities of Cuiabá and Várzea Grande, State of Mato Grosso, Brazil.

Levantamento de Scolytidae (Coleoptera) em plantações de Eucalyptus spp. em Cuiabá, estado de Mato Grosso.

Realizou-se um levantamento populacional de especies da familia Scolytidae em plantios de Eucalyptus camaldulensis Dehnh. Dehnh. Dehnh., Eucalyptus citriodora Hook. f., Eucalyptus pellita F. Muell. e Eucalyptus urophylla S.T. Blake, com auxilio de armadilhas etanolicas, modelo escolitideo-Curitiba, no municipio de Cuiaba, estado de Mato Grosso, de marco de 1998 a fevereiro de 1999. Foram utilizadas 24 armadilhas, sendo seis por talhao/especie de Eucalyptus . As coletas foram quinzenais e divididas em dois periodos: seco (maio-outubro) e chuva (novembro-abril). Foram coletados um total de 19.153 individuos, distribuidos em 11 generos e 42 especies. Nos periodos seco e chuvoso foram coletados 9.865 e 9.288 individuos respectivamente. Nos talhoes de Eucalyptus pellita e de Eucalyptus urophylla, foram coletados as maiores quantidades de individuos em ambos os periodos analisados. Cryptocarenus diademantus Eggers, 1937 ; Cryptocarenus seriatus Eggers, 1933; Cryptocarenus heveae (Hagedorni, 1912); Hypothenemus obscurus (Fabricius, 1801) e Xyleborus spinosulus (Schedl, 1934) foram, quantitativamente, as especies mais importantes nos plantios das quatro especies de Eucalyptus .

Scattering matrix of cylindrical posts centered on the walls of rectangular waveguides

A model, based on the moment method, is developed for the determination of the scattering matrix of cylindrical metal posts of variable height centered on two or four walls of a rectangular waveguide. The case of two posts, on the horizontal or on the vertical walls of the waveguide, is treated initially. The equivalence principle, dyadic Greens functions and the moment method are applied to the construction of a rigorous solution of the problem. Posts on the four walls of the waveguide are considered subsequently. In this case an approximation is introduced, by neglecting the influence of the fields scattered by the horizontal posts on the currents induced on the vertical ones, which is justified due to the small magnitude of such fields. It results a rapid, stable and accurate algorithm of calculus, the accuracy being corroborated by experimental data. >

Estimulação do enraizamento de estacas de seringueira (Hevea brasiliensis Muell. Arg.) pela aplicação de reguladores vegetais

Este ensaio foi conduzido com o objetivo de verificar o efeito do acido indolbutirico (lBA), acido naftalenacetico (NAA), acido indolilacetico (IAA) e acido succinico-2,2-dimetilhidrazida (SADH) no enraizamento de estacas de plantas jovens de seringueira. As estacas utilizadas foram retiradas da parte inferior das plantas e tiveram suas bases imersas por 1 hora em agua, ou em solucoes de IBA, NAA, IAA e SADH 2500 ppm. Os resultados obtidos 77 dias apos o plantio mostraram que IBA promoveu maior porcentagem de enraizamento com relacao ao controle. Porem, em relacao ao brotamento das estacas, o tratamento com SADH mostrou-se superior ao controle. Os tratamentos com NAA e IAA revelaram resultados inferiores ao controle em relacao ao numero de estacas vivas, estacas com calos e estacas com brotacoes.

Levantamento da termitofauna em reflorestamento de Eucalyptus camaldulensis e mata ripária no município de Cuiabá, estado de Mato Grosso

Este estudo teve o objetivo de coletar,identificar e comparar as principais especiesde cupins presentes em diferentesambientes - Mata Riparia e plantio deEucalyptus camaldulensis, com a utilizacaode armadilhas celulosicas (Termitrap).A pesquisa foi realizada no periodode janeiro a junho e de setembro anovembro de 2007, na Fazenda Mutuca,da empresa Sadia SA, localizada emCuiaba-MT. Na coleta dos cupins foramutilizadas 30 armadilhas/area, dispostasem duas areas distintas: area um – matariparia; area dois – plantio de eucalipto.As armadilhas de papelao, modelo“termitrap”, foram dispostas em linhareta, permanecendo em campo durante30 dias. Em seguida, foram retiradas e oscupins contados e identificados. Foramcoletados um total de 467.059 individuos,incluindo as especies nao identificadas– provavelmente quatro especies– e seis especies identificadas, sendoa especie Nasutitermes macrocephalusmenos expressiva quantitativamente.Heterotermes tenuis foi a especie queapresentou a maior quantidade de individuos(64,32%), seguida pela especieNasutitermes kemneri (30,42%) do totalcoletado, nos ambientes mata riparia eplantio de Eucalyptus camaldulensis.

Distribuição Sazonal de Heterotermes Tenuis (Hagen) em Povoamentos de Eucalyptus spp.

This work aimed to study the sazonal distribution of Heterotermes tenuis (Hagen) using cellulosic traps installed at the soil level; 1,64 ft; 3,28 ft and 4,92 ft of depths. Sampling occurred every two weeks for a period of 12 months in Cuiaba-MT in Eucalyptus spp plantations. Data were analyzed using the Inflated Poisson Zeros (PIZ) statistical model. In total 266,918 individuals were collected, and the higher average was in traps at 3,28 ft depth. The analysis of sampled sites revealed MG1277 clone and the specie Eucalyptus camaldulensis with the highest and lowest amount of termites collected in traps, respectively. The increased number of individuals is related to the rainfall factor, but a greater number of individuals during the dry season was recorded due to the favorable conditions offered within the cellulosic traps such as food, temperature and humidity.

Formigas (Hymenoptera: Formicidae) Bioindicadoras de Degradação Ambiental em Poxoréu, Mato Grosso, Brasil

This work aimed to evaluate the ant species occurring in an area degraded by diamond mining, defining the bioindicators of this degradation. The present study was conducted bimonthly in the municipality of Poxoreu, Mato Grosso state, between June 2010 and April 2011. Four environments were sampled: A1 - area degraded by mining, A2 - area of Cerrado vegetation with recent anthropic activities, A3 - area of Cerrado disturbed approximately 30 years ago, and A4 - area of preserved Cerrado. In each environment, 11 pitfall traps, equidistant 15 meters, were installed to collect ants for 24 hours. The individuals were taken to the Laboratory of Forest Protection/FENF/UFMT and screened for later identification. The bioindicator species were indicated by faunal analysis. The ant species Camponotus (Myrmaphaenus) sp.1 and Forelius brasiliensis can be considered bioindicators of environmental degradation in the areas of ​diamond ​mining and human disturbance, while the species Camponotus atriceps, Pachycondyla crassinoda and Paraponera clavata can be considered bioindicators in the preserved Cerrado area.

Distribuição Sazonal de Heterotermes Tenuis (Hagen) em Povoamentos de Eucalyptus spp. / Seasonal Distribution of Heterotermes tenuis (Hagen) in Eucalyptus spp.

This work aimed to study the sazonal distribution of Heterotermes tenuis (Hagen) using cellulosic traps installed at the soil level; 1,64 ft; 3,28 ft and 4,92 ft of depths. Sampling occurred every two weeks for a period of 12 months in Cuiaba-MT in Eucalyptus spp plantations. Data were analyzed using the Inflated Poisson Zeros (PIZ) statistical model. In total 266,918 individuals were collected, and the higher average was in traps at 3,28 ft depth. The analysis of sampled sites revealed MG1277 clone and the specie Eucalyptus camaldulensis with the highest and lowest amount of termites collected in traps, respectively. The increased number of individuals is related to the rainfall factor, but a greater number of individuals during the dry season was recorded due to the favorable conditions offered within the cellulosic traps such as food, temperature and humidity.

Formigas (Hymenoptera: Formicidae) Bioindicadoras de Degradação Ambiental em Poxoréu, Mato Grosso, Brasil / Ants (Hymenoptera: Formicidae) as Bioindicators of Environmental Degradation in Poxoréu, Mato Grosso, Brazil

This work aimed to evaluate the ant species occurring in an area degraded by diamond mining, defining the bioindicators of this degradation. The present study was conducted bimonthly in the municipality of Poxoreu, Mato Grosso state, between June 2010 and April 2011. Four environments were sampled: A1 - area degraded by mining, A2 - area of Cerrado vegetation with recent anthropic activities, A3 - area of Cerrado disturbed approximately 30 years ago, and A4 - area of preserved Cerrado. In each environment, 11 pitfall traps, equidistant 15 meters, were installed to collect ants for 24 hours. The individuals were taken to the Laboratory of Forest Protection/FENF/UFMT and screened for later identification. The bioindicator species were indicated by faunal analysis. The ant species Camponotus (Myrmaphaenus) sp.1 and Forelius brasiliensis can be considered bioindicators of environmental degradation in the areas of ​diamond ​mining and human disturbance, while the species Camponotus atriceps, Pachycondyla crassinoda and Paraponera clavata can be considered bioindicators in the preserved Cerrado area.

Desenvolvimento in vitro do fungo simbionte de Atta sexdens rubropilosa Forel, 1908 (Hymenoptera: Formicidae) em meio de cultura com diferentes extratos vegetais

The objective of this study was to evaluate the in vitro development of Leucoagaricus gongylophorus, the symbiotic fungus of Atta sexdens rubropilosa in culture medium added with extracts of 24 plant species. The fungus was inoculated in PDA added with vegetables extracts and four controls, in Petri dishes. The dishes were maintained in climate chambers at temperature of 25±1°C in the dark, to period of 42 days. The fungal growth was evaluated weekly by diameter of the colony. The results showed that the symbiotic fungus of these ants has differentiated growth when compared to the extracts provided in the dishes, and the medium supplemented with extracts of arica (Physocalymma scaberrimum), cerejeira (Amburana acreana), cedro (Cedrela fissilis), timbo (Magonia pubescens), leucena (Leucaena leucocephala) e mogno (Swietenia macrophylla) hampered the development, however the extracts of genipapo (Genipa americana), seringueira (Hevea brasiliensis), inga (Inga edulis) e cambara (Vochysia divergens) had better conditions for the development of the symbiotic fungus.