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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
29/06/1996 |
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Data da última atualização: |
29/06/1996 |
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Autoria: |
HEWITT, G. B. |
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Título: |
Fatores ambientais que afetam a sobrevivencia de ovos das cigarrinhas-das-pastagens durante a estacao seca, no brasil central. |
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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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Notas: |
CNPGC. |
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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<0,005) 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 addicional 34% of the eggs were desiccated and 35% were nonviabel. Egg survival was estimated to be 8,5% and was greater im 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 ofpastures. At onesite more eggs hatched in a high grass pasture (74%) than in a low grass pasture (59%). Although high grass may receive less damage from spittlebug feeding the disadvantages of maintaining grass>30 cmappear to outweigh the advantages. |
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Thesagro: |
Entomologia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01508naa a2200145 a 4500
001 1318714
005 1996-06-29
008 1986 bl uuuu u00u1 u #d
100 1 $aHEWITT, G. B.
245 $aFatores ambientais que afetam a sobrevivencia de ovos das cigarrinhas-das-pastagens durante a estacao seca, no brasil central.
260 $c1986
500 $aCNPGC.
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<0,005) 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 addicional 34% of the eggs were desiccated and 35% were nonviabel. Egg survival was estimated to be 8,5% and was greater im 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 ofpastures. At onesite more eggs hatched in a high grass pasture (74%) than in a low grass pasture (59%). Although high grass may receive less damage from spittlebug feeding the disadvantages of maintaining grass>30 cmappear to outweigh the advantages.
650 $aEntomologia
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.21, n.12, p.1237-1243, dez. 1986.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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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): Área de Informação da Sede. |
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| Registros recuperados : 6 | |
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