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Search Results: 1 - 10 of 477739 matches for " ERVANDIL CORRêA COSTA "
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Geedre Adriano Borsoi,Ervandil Corrêa Costa
Ciência Florestal , 2001,
Abstract: A pesquisa teve por objetivo avaliar e comparar os teores nutricionais de plantas de erva-mate, Ilex paraguariensis St. Hil., atacadas e n o-atacadas pela broca-da-erva-mate Hedypathes betulinus (Klug, 1825) (Col.: Cerambycidae), para identificar possíveis desequilíbrios nutricionais no solo e nas folhas. A área amostrada está localizada no município de Catanduvas, SC. O erval estudado é homogêneo, com idade de 8 anos e densidade de 2.100 plantas/ha. As amostragens de folhas e de solo foram realizadas nos meses de fevereiro e abril de 1999. As amostras foram submetidas à análise química, em Laboratório de Análise Química. Foram interpretados os teores para cada elemento químico, realizaram-se os testes de compara es de médias “t” e “f” e o teste de homogeneidade de variancias. Observou-se que o solo apresenta teores considerados adequados de N e P, teores baixos de K, Ca e Mg e altos para S, B, Fe, Mn, Zn, Cu, Na, Al, Al+H, Ph e SMP, para a erva-mate. Já na análise foliar, as plantas apresentam teores considerados adequados de K, Ca, B, Zn e Na, teores baixos de P, Mn e S e altos de N, Mg, Fe, e Cu. Nessa análise, chamou a aten o, as altas concentra es de N e os baixos níveis de S no tecido foliar. O teste “t” registrou diferen a significativa para o P do solo e de folhas e o teste “f”, revelou o ferro do solo, como elemento químico com diferen a significativa entre as médias das duas condi es de plantas. O P e o Fe do solo e ainda, o K, S e Mn de folhas foram os elementos químicos que registraram heterogeneidade significativa de variancias. Das variáveis estudadas, as plantas atacadas foram as que revelaram maior varia o entre as médias.
Silva, Mauro Tadeu Braga da;Costa, Ervandil Corrêa;
Ciência Rural , 2002, DOI: 10.1590/S0103-84782002000100002
Abstract: the study was carried out in the 1991 and 1992 growing seasons, in cruz alta, rio grande do sul state. the objective was to evaluate the infestation levels of diloboderus abderus sturm, 1826 (coleoptera: melolonthidae) on black oats (avena strigosa l.), flax (linum usitatissimum l.), corn (zea mays l.) and sunflower (helianthus annuus l.) under no-tillage. increasing number of larvae/m2 decreased plant population, plant biomass and yield. control levels were different among the four crops species. results of the insect damage suggested the control level of 12 larvae/m2 in flax, 10 larvae/m2 in black oats, 0.5 larva/m2 in corn and 0.4 larva/m2 in sunflower as indicator for these crops seed treatment with insecticides.
Desfolhamentos contínuos e seqüenciais simulando danos de pragas sobre a cultivar de soja BRS 137
Reichert, Jo?o Luiz;Costa, Ervandil Corrêa;
Ciência Rural , 2003, DOI: 10.1590/S0103-84782003000100001
Abstract: the objective of this research was to evaluate the effect of both continuous and sequential defoliation on soybean yield (variety brs 137). the treatments were evaluated during the vegetative and reproductive stages by using the injury levels recommended for the management of soybean defoliating pests. the study was conducted at the university of passo fundo, in passo fundo-rs, from december 1999 to may 2000. the experimental design was complete randomized blocks with six treatments and four replications. the following treatments were tested: (i) 33% of continuous defoliation at stages v4 to v9 and of (ii) 17 and (iii) 33% at stages r1 to r4 (fehr & cavines, 1977, stage); sequential defoliation of (iv) 33+17% and (v) 17+33% from stages v4 to v9 and from stages r1 and r4; and (vi) control (no defoliation). the defoliation levels 33% in the vegetative stage and 17% in the reproductive stage did not affect grain yield (kg ha-1). in contrast, the sequential defoliating levels of 33+17% and 17+33% in the vegetative and reproductive stages, respectively, caused an yield reduction for brs 137 soybean variety. the grain yield, the number of pods, number of grains, and the weight of grains were the most important components in determining the yield decrease with the sequential leaf defoliation of 33+17% and 17+33%. all the leaf losses for decreased the number of grains/plant and the number of pods/plant. considering the leaf action levels recommended to control of the leaf-feeding insects in soybean, it should be indicated for the brs 137 soybean variety a leaf loss of 33% in the stages v4 to v9 or 17% in the stages r1 to r4.
Ocorrência de Erinnyis ello e Spodoptera marima na cultura da mamona no Rio Grande do Sul
Ribeiro, Leandro do Prado;Costa, Ervandil Corrêa;
Ciência Rural , 2008, DOI: 10.1590/S0103-84782008000800040
Abstract: the aim of this research was to carry out the population survey and check an occurrence of lepidopterous associated to castor bean plantation in rio grande do sul state, brazil. the population study was performed in castor bean plantation, al guarany 2002 cultivate, implemented in the experimental area soils department at federal university of santa maria, in santa maria, rio grande do sul state. the sow occurred in the first fifteen days of november of 2006, in an area of around 0,3 ha. the weekly appraisement started 20 days after the emergency of the plants and went until their maturation, creating a total of 15 evaluations, being the caterpillars hand collected in 40 random plants/ date of evaluation. the collected samples were brought to the laboratory of entomology at dfs/ ufsm, where they were kept until adulthood. spodoptera marima schs. (lepidoptera: noctuidae) and erinnyis ello l. (lepidoptera: sphingidae) represented for 15.2 and 28.3% of the amount of collected caterpillars, respectively. so, this study reports the first occurrence of these two lepidopterous species associated to castor bean plantation in rio grande do sul state.
Desfolhamento em estádios de desenvolvimento da soja, cultivar BR 16, no rendimento de gr?os
Ribeiro, Ana Lúcia de Paula;Costa, Ervandil Corrêa;
Ciência Rural , 2000, DOI: 10.1590/S0103-84782000000500004
Abstract: the work was carried out at the federal university of santa maria, state of rio grande do sul, in 1997/1998 using the cultivar br 16. statistical setup was a block design with sub-divided plots, with 4 replications. the objective of this research was to evaluate the yield of the soybean variety br16 when submitted to different defoliation levels (0, 17, 33, 50, 67 and 100%) and at different phases of development (v9, r3, r5 and r6) in agreement with the scale of fehr & caviness (1977). the defoliation levels of 17, 33 and 50% decreased seed yield by approximately 6% and the last two levels 67 and 100%, by about 8 and 37% in relation to 0% of defoliation. levels of defoliation above 50% decrease the number of normal pods substantially and grains for plant when made at the beginning in the stadiums of formation of the pods (r3) and beginning of the formation of grains (r5). the reduction of grain yield was effected by the number of normal pods number of normal grains and weight of 100 seeds, which were the components most effected by the treatments.
Pentatomids associated with different forest species in Itaara, RS, Brazil
Juliana Garlet,Maína Roman,Ervandil Corrêa Costa
Biotemas , 2010,
Abstract: The objective of this study was to determine qualitatively and quantitatively the pentatomid fauna associated with the canopy of different native species during the period from September 2005 to September 2006. Insects were collected from among nine botanical species: Gochnatia polymorpha (Less.) (cambará), Eugenia uniflora Berg. (pitangueira), Acca selowiana (Berg) Burret (goiaba-da-serra), Psidium cattleianum Sabine (ara á), Baccharis spp., Solanaum mauritianum Scop. (fumo-bravo), Micanea cinerascens Miq. (passiquinho), Calliandra brevipes Bhent. (caliandra), and Schinus molle L. (aroeira) located at Rodolfo da Costa Dam in Itaara, RS, Brazil. Samples were taken every two weeks with a conical funnel made of tin plate (2mm), 70cm in diameter at the rim and 63cm in height. One sample per botanical species for each sampling date was taken, by shaking the branches, ten times over the funnel. Samples were sent to the Entomology Laboratory of the Crop Protection Department of the Federal University of Santa Maria, where the material was analyzed. A total of nine Pentatomidae species were identified. Edessa rufomarginata (De Geer, 1773) was the species of highest ocurrence followed by Thyanta humilis (Bergroth, 1891). The botanical species S. mauritianum presented the greatest number of Pentatomidae species, with an occurrence of 26.9%.
Seed predation in Acacia mearnsii De Wild. (Fabaceae, Mimosoideae).
Leonardo da Silva Oliveira,Ervandil Corrêa Costa
Biotemas , 2009,
Abstract: This work aimed to identify the predator insect of seeds of Acacia mearnsii De Wild. (Fabaceae, Mimosoideae) (black wattle), characterizing the damage inflicted and levels of occurrence over the long term. Therefore, biweekly collections of seed pods were taken in the forest of black wattle situated in the municipal district of Minas do Le o, Rio Grande do Sul, Brazil. It was verified that Stator limbatus (Horn, 1873) (Coleoptera, Chrysomelidae, Bruchinae) was responsible for the predation by attacking 44.3% of the collected seeds and consuming 60.4% of the weight of these seeds. The highest incidence of S. limbatus adults occurred in January.
Ervandil Corrêa Costa,Paulo C. Bogorni,Vicente H. Bellomo
Ciência Florestal , 2013,
Abstract: Efetuou-se coletas de pentatomídeos, no município de S o Sepé, RS, em dezembro de 1992 e no decorrer do ano de 1993, objetivando o conhecimento das espécies de Pentatomidae e suas respectivas plantas hospedeiras. Os insetos foram extraídos das plantas, usando-se um funil c nico com um saco coletor na extremidade para a reten o do material entomológico. Retirou-se de cada espécie vegetal somente uma amostra, obtida através de dez sacudidas dos ramos sobre o funil. As coletas foram efetuadas quinzenalmente. Obteve-se dez espécies de Pentatomidae distribuidos em sete diferentes plantas hospedeiras. Das plantas estudadas, camboim (Myrciaria tenella) destaca-se como hospedeiro preferencial e Thyanta (Argosoma) patruelis é a espécie de percevejo que apresenta a maior diversidade hospedeira.
Silva Mauro Tadeu Braga da,Costa Ervandil Corrêa
Ciência Rural , 2002,
Abstract: O estudo aqui relatado foi conduzido nas safras agrícolas de 1991 e 1992, em Cruz Alta, no Rio Grande do Sul. O objetivo foi avaliar o efeito de diferentes níveis de infesta o de Diloboderus abderus Sturm, 1826 (Coleoptera: Melolonthidae) em aveia preta (Avena strigosa L.), em linho (Linum usitatissimum L.), em milho (Zea mays L.) e em girassol (Helianthus annuus L.), no sistema de plantio direto. O aumento do número de larvas/m2 propiciou a ocorrência de danos e, em conseqüência, a diminui o da popula o de plantas, da massa seca da parte aérea e da produtividade. Os níveis de controle obtidos foram variáveis dependendo da cultura. Com base nos danos produzidos pelo inseto, sugerem-se os níveis de controle de 12 larvas/m2 em linho, de 10 larvas/m2 em aveia preta, de 0,5 larva/m2 em milho e de 0,4 larva/m2 em girassol, como indicador para tratamento de sementes destas culturas com inseticidas.
Desfolhamentos contínuos e seqüenciais simulando danos de pragas sobre a cultivar de soja BRS 137
Reichert Jo?o Luiz,Costa Ervandil Corrêa
Ciência Rural , 2003,
Abstract: O objetivo deste trabalho foi avaliar os efeitos dos desfolhamentos contínuo e seqüencial, tanto na fase vegetativa como reprodutiva, sobre o rendimento de gr os de soja (cultivar BRS 137), utilizando os níveis de danos estabelecidos para o manejo de pragas nessa cultura. O trabalho foi realizado na Universidade de Passo Fundo, RS, na safra 1999/2000. O delineamento experimental foi blocos ao acaso e os tratamentos, com quatro repeti es, foram: desfolhamentos contínuos de (i) 33% nas fases V4 a V9 e de (ii) 17 e (iii) 33% nas fases R1 a R4 (escala de FEHR & CAVINESS, 1977); desfolhamento seqüencial de (iv) 33+17% e (v) 17+33%, respectivamente nas fases V4 a V9 e nas fases R1 a R4; e (vi) testemunha (sem desfolhamento). Observou-se que os níveis de desfolhamento de 33% na fase vegetativa e 17% na reprodutiva, n o afetaram o rendimento de gr os (kg ha-1), enquanto o desfolhamento seqüencial de 33+17% e 17+33% nas fases vegetativa e reprodutiva, respectivamente, e 33% na reprodutiva, reduziram o rendimento de gr os. O rendimento de gr os por planta, número de legumes normais e de gr os, e o peso do gr o foram os componentes determinantes na redu o do rendimento de gr os de soja (kg ha-1), devido os desfolhamentos seqüenciais de 33+17% e 17+33%. Todos os desfolhamentos reduziram o número de gr os por planta e de legumes normais por planta. Considerando os níveis de desfolhamento recomendados para o controle de insetos filófagos, pode ser indicado, para a cultivar BRS 137, desfolhamento de 33% na fase vegetativa (V4 até V9) ou 17% na fase reprodutiva (R1 até R4).
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