sexta-feira, abril 02, 2010

PERCEVEJO CALIFORNIANO Novo insecto invasor encontrado na ilha Terceira


Foi encontrado, na zona urbana de Angra do Heroísmo, um novo insecto invasor, segundo noticiam os docentes da Universidade dos Açores.Trata-se de um percevejo californiano que, nalguns casos reportados, pode transformar-se em praga.
Belonochilus numenius Say (Lygaeidae Orsillinae) – assim se denomina o percevejo californiano que foi encontrado na zona urbana de Angra do Heroísmo.
A informação é avançada pelo portal da biodiversidade, desenvolvido pela Universidade dos Açores, através do Departamento de Ciências Agrárias (CITA-A; Grupo da Biodiversidade dos Açores e do Departamento de Biologia (UA-CIBIO), numa iniciativa dos Projectos INTERREG III B “Atlântico” (2003-2005) e “BIONATURA" (2007-2008).
O percevejo, segundo noticiam os investigadores universitários começou por se espalhar no sul da Europa, passando agora a existir na ilha Terceira.
Na ilha Terceira, o insecto invasor, adiantam, vive na cryptomeria japónica.
De acordo com um boletim científico referente ao insecto que o portal da biodiversidade associa à notícia, a troca mundial de bens e produtos tem “facilitado o movimento de espécies invasoras” entre países, como é o caso do insecto em referência.
O percevejo Belonochilus numenius Say, refere a literatura científica, é facilmente identificável devido à sua aparência.

Pragas em zonas urbanas

Em termos biológicos, este tipo de percevejo completa o seu ciclo biológico nas sementes das árvores Platanus occidentalis.
Nalguns casos, estas espécies já foram reportadas como pragas em parques públicos, como é o caso de Londres.
Os investigadores da Belonochilus numenius Say aconselham uma “elevada atenção” à existência desta espécie em árvores ornamentais usadas em parques e em zonas urbanas das cidades.
Isto porque, explicam, é preferencialmente neste locais que este tipo de insecto “pode transformar-se em praga”, uma vez que o Belonochilus numenius Say não assume estas proporções em habitats naturais florestais, aponta o estudo.

(In Humberta Augusto haugusto@auniao.com)

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