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Effect of two dosages of Metarhizium anisopliae var. acridum against Rhammatocerus schistocercoides Rehn PAB
Faria,Marcos Rodrigues de; Magalhães,Bonifácio Peixoto; Alves,Roberto Teixeira; Schmidt,Francisco Guilherme Vergolino; Silva,João Batista Tavares da; Frazão,Heloísa.
The fungus Metarhizium anisopliae var. acridum, strain CG 423, was tested under field conditions against the gregarious grasshopper Rhammatocerus schistocercoides (Rehn) (Orthoptera: Acrididae). Conidia formulated in a racemic mixture of soybean oil and kerosene were sprayed under field conditions using an ultralow-volume hand-held atomizer Ulva Plus adjusted to deliver 2.9 L/ha. Bands composed of 2nd instar nymphs were treated with either 5.0x10(12) or 1.0x10(13) viable conidia/ha. The number of insects in each band was estimated at day one following spraying and by the end of the field trial (15 to 16 days post-treatment). Reductions in population size reached, in average, 65.8% and 80.4% for bands treated with the higher and lower dosage, respectively....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological control; Microbial pesticide; Entomogenous fungus; Grasshopper; Oil formulation.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002001100003
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