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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
08/12/1997 |
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Data da última atualização: |
08/12/1997 |
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Autoria: |
HEWITT, G. B. |
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Afiliação: |
CNPGC. |
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Título: |
Environmental factors affecting spittlebug egg survival during the dry season in central Brazil. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v.21, n.12, p.1237-1243, dez. 1986. |
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Idioma: |
Inglês |
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Conteúdo: |
Spittlebug egg survival and hatching was compared in pastures where differences occurred in vegetative characteristics and grazing intensity. Egg samples were placed in pastures at the start of the dry season and recovered before hatching began. Significantly (P<0.05) more eggs were recovered from areas where litter was present than from bare soil areas. Mortality from predators and scavengers was estimated at 73%. An additional 34% of the eggs were desiccated and 35% were nonviable. Egg survival was estimated to be 8,5% and was greater in pastures with the following characteristics: 1) canopy height > 30 cm; 2) abundant litter; 3) plant cover < 50%;4) minimal or no grazing. More predators, especially spiders (Araneida) were also collected from these types of pastures. At one site more eggs halched in a high grass pasture (74%) than in a low grass pature (59%). Although high grass may receive less damage from spittlebug feeding the disadvantages of maintaining grass > 30 cm appear to outweigh the advantages. |
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Palavras-Chave: |
Araneida; Spider. |
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Thesagro: |
Aranha; Brachiaria Decumbens; Deois Flavopicta; Zulia Entreriana. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01604naa a2200193 a 4500
001 1104446
005 1997-12-08
008 1986 bl uuuu u00u1 u #d
100 1 $aHEWITT, G. B.
245 $aEnvironmental factors affecting spittlebug egg survival during the dry season in central Brazil.
260 $c1986
520 $aSpittlebug egg survival and hatching was compared in pastures where differences occurred in vegetative characteristics and grazing intensity. Egg samples were placed in pastures at the start of the dry season and recovered before hatching began. Significantly (P<0.05) more eggs were recovered from areas where litter was present than from bare soil areas. Mortality from predators and scavengers was estimated at 73%. An additional 34% of the eggs were desiccated and 35% were nonviable. Egg survival was estimated to be 8,5% and was greater in pastures with the following characteristics: 1) canopy height > 30 cm; 2) abundant litter; 3) plant cover < 50%;4) minimal or no grazing. More predators, especially spiders (Araneida) were also collected from these types of pastures. At one site more eggs halched in a high grass pasture (74%) than in a low grass pature (59%). Although high grass may receive less damage from spittlebug feeding the disadvantages of maintaining grass > 30 cm appear to outweigh the advantages.
650 $aAranha
650 $aBrachiaria Decumbens
650 $aDeois Flavopicta
650 $aZulia Entreriana
653 $aAraneida
653 $aSpider
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.21, n.12, p.1237-1243, dez. 1986.
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Embrapa Unidades Centrais (AI-SEDE) |
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| 6. |  | CARPANEZZI, A. A. Benefícios indiretos da floresta. In: GALVAO, A.P.M., org. Reflorestamento de propriedades rurais para fins produtivos e ambientais: um guia para acoes municipais e regionais. Brasilia: Embrapa Comunicacao para Transferencia de Tecnologia / Colombo: Embrapa Florestas, 2000. p. 19-55.| Biblioteca(s): Embrapa Florestas. |
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| 10. | | CARPANEZZI, A. A. Cultura da erva mate no Brasil: conflitos e lacunas. In: WINGE, H.; FERREIRA, A. G.; MARIATH, J. E. de A.; TARASCONI, L. C. (Org.). Erva-mate: biologia e cultura no Cone Sul. Porto Alegre: Ed. da UFRGS, 1995. p. 43-46. I Reuniao Tecnica do Cone Sul sobre a Cultura da Erva-mate, 1992, Porto Alegre.| Biblioteca(s): Embrapa Florestas. |
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| 14. | | CARPANEZZI, A. A. Espécies para recuperação ambiental. In: GALVAO, A. P. M. (Coord.). Espécies não tradicionais para plantios com finalidades produtivas e ambientais. Colombo: Embrapa Florestas, 1998. p. 43-53. Seminário realizado em Curitiba, de 6 a 8 de outubro de 1998.| Biblioteca(s): Embrapa Florestas. |
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| 19. | | CARPANEZZI, A. A. Uma introdução à recuperação de ecossistemas degradados no Brasil. In: PROGRAMA COOPERATIVO PARA EL DESARROLLO TECNOLOGICO AGROPECUARIO DEL CONO SUR (Montevideo, Uruguay). Recuperacion y manejo de ecosistemas degradados. Montevideo, 1998. p. 41-42. (IICA/PROCISUR. Dialogo, 49). Taller sobre Recuperacion y Manejo de Ecosistemas Degradados, 1995, Santa Rosa, La Pampa.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Florestas. |
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| Registros recuperados : 275 | |
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