02380naa a2200313 a 450000100080000000500110000800800410001910000200006024501100008026000090019050001350019952013130033465000230164765000240167065000140169465300240170865300240173265300280175665300160178465300240180065300200182465300250184470000220186970000170189170000220190870000230193070000210195377300920197411087972018-11-20       2002    bl uuuu     u00u1 u    #d1 aFARIA, M. R. de  aEffect of two dosages of Metarhizium anisopliae var. acridum against Rhammatocerus schistocercoides Rehn.  c2002  aTítulo em português: Efeito de duas dosagens de Metarhizium anisopliae  var. acridum contra Rhammatocerus schistocercoides Rehn.  aThe 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 5.0x1012 or 1.0x1013 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. For both dosages, total mortality rates of insects collected at two days post-application, and kept in cages for 14 days under lab conditions, showed no significant differences as compared to that obtained with insects collected immediately after spraying. Healthy insects were fed to native grasses sprayed on the field with 1.0x1013 viable conidia/ha. Mortality levels of the nymphs fed on grasses collected two and four days post-application were not affected when compared to nymphs fed on grasses collected immediately following application.  abiological control  aControle Biológico  aGafanhoto  aentomogenous fungus  aformulação oleosa  afungo entomopatogênico  agrasshopper  amicrobial pesticide  aoil formulation  apesticida microbiano1 aMAGALHÃES, B. P.1 aALVES, R. T.1 aSCHMIDT, F. G. V.1 aSILVA, J. B. T. da1 aFRAZAO, H. da S.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 37, n. 11, p. 1531-1539, nov. 2002