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Os insetos pragas da Acacia tortilis na TunÃsia
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ISBN10: 6630437667
ISBN13: 9786630437669
Publisher: Edicoes Nosso Conhecimento
Pages: 68
Weight: 0.23
Height: 0.16 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786630437669
Publisher: Edicoes Nosso Conhecimento
Pages: 68
Weight: 0.23
Height: 0.16 Width: 6.00 Depth: 9.00
Language: Portuguese
A Acacia tortilis subsp. raddiana, espécie endémica da região árida da TunÃsia, está protegida desde 1980, com a criação do Parque Nacional de Bouhedma. A sua regeneração natural é limitada pela predação das suas sementes por duas espécies de escaravelhos (Coleoptera: Bruchinae): Bruchidius aurivillii e Bruchidius raddianae. Este trabalho demonstrou que a taxa de infestação das sementes por estes dois bruchos varia de ano para ano. Assim, a taxa de infestação das sementes por B. aurivillii diminuiu de 74,54% para 38,5% entre 2008 e 2009, enquanto a de B. raddianae aumentou de 24,53% para 63,27% durante o mesmo perÃodo. Trata-se também de duas espécies monovoltinas e a sua emergência está intimamente ligada à fenologia da sua planta hospedeira. Além disso, foram identificados, no decurso deste trabalho, vários himenópteros parasitóides destes escaravelhos, incluindo Pteromalidae, Eulophidae, Eupelmidae e Trichogrammatidae. Por fim, foram testados no parque dois métodos de controlo mecânico e quÃmico, que demonstraram a sua eficácia, o que abre novas possibilidades de combate a estas duas pragas seminÃvoras.
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