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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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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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| Registros recuperados : 6 | |
| 6. |  | NILAKHE, S. S.; HEWITT, G. B.; PASCHOAL, G. O.; BUAINAIN, C. M.; SOUZA, A. R. R. Influence of collection method and collection time on survival, sexual proportion and number of spittlebug adults captured. Pesquisa Agropecuaria Brasileira, Brasilia, v.22, n.9/10, p.929-934 set./out.1987.| Biblioteca(s): Embrapa Unidades Centrais. |
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| Registros recuperados : 6 | |
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