Data/hora: 10/06/2024 13:47:31

Provedor de dados: | 44
País: | Brazil
Título: | Food consumption of Rhammatocerus schistocercoides Rehn (Orthoptera: Acrididae) infected by the fungus Metarhizium flavoviride Gams &amp;amp; Rozsypal
Autores: | Faria,Marcos R. de; Almeida,Danylo de O.; Magalhães,Bonifácio P.
Data: | 1999-03-01
Ano: | 1999
Palavras-chave: | Insecta; Feeding reduction; Foliage consumption; Entomopathogenic fungus.
Resumo: | Foliage consumption by nymphs and adults of the grasshopper Rhammatocerus schistocercoides Rehn infected with the fungus Metarhizium flavoviride Gams &amp;amp; Rozsypal was evaluated. Sixth and eighth instar nymphs and female adults consumed on average (±SEM) 6.9 ± 0.36 cm² (60.7 ± 2.92 mg of dry matter), 11.0 ± 1.35 cm² (74.9 ± 9.24 mg d.m.), and 16.0 ± 0.50 cm² (126.5 ± 6.35 mg d.m.) of sugarcane leaves per day, equivalent to 85.4, 35.9 and 41.9% of the insect body weights, respectively. Eighth instar nymphs and female adults inoculated with M. flavoviride (5,000 conidia / insect) ingested less food from day three onward and showed at day 10 an average consumption 74.5 and 45.6% lower than control insects, respectively. Adult females topically treated with a sub-lethal dosage (3 ml of a 8 ppm suspension / insect) of the chemical insecticide diflubenzuron showed consumption rates comparable to untreated insects (P=0.065). The combination fungus + chemical did not show results different from those obtained with the fungus alone (P=0.405). A strong correlation (r²=0.998) between production of fecal pellets by R. schistocercoides and food consumption was observed. These results confirmed the high voracity of R. schistocercoides and showed a remarkable adverse effect of the fungus on food intake by infected nymphs and adults.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591999000100010
Editor: | Sociedade Entomológica do Brasil
Relação: | 10.1590/S0301-80591999000100010
Formato: | text/html
Fonte: | Anais da Sociedade Entomológica do Brasil  v.28 n.1 1999
Fonte: | info:eu-repo/semantics/openAccess