02401naa a2200277 a 450000100080000000500110000800800410001910000170006024501050007726000090018230000150019149000080020652015880021465000110180265000210181365000120183465000310184665000150187765000220189265000110191465000140192565300110193965300320195070000250198277301160200714626082006-03-09       2000    bl uuuu     u00u1 u    #d1 aCORSO, I. C.  aControl of Sternechus subsignatus (Col.bCurculionidae) with insecticides applied on soybean plants.  c2000  ap.671. v.2  vv.2  aSternechus subsignatus Boheman (Col.: Curculionidae), a stem borer gall maker, is a weevil that damage soybean plants by scraping stems and petioles, sometimes causing total loss of soybean fields. Aiming to test some insecticides and dosages for controling the weevil, two field experiments were carried out in 1998, in Maua da Serra and Pinhao, Parana State, Brazil. The experiment was in a randomized complete block desing, with four replicates per treatment. The plots measured 4x8m and 6x7m, respectivelly for each location; plants were at the V6 and V3 growing stage. Treatments e evaluated were: beta-cyfluthrin, in the emulsifiable concentrate (EC) and flowable (FW) formulations (10ga.i.ha -1), ethophenprox (45ga.i.ha -1), fipronil (32, 48 e 64 ga.i.ha -1), methamidophos (480ga.i.ha -1), thiamethoxan (210ga.i.ha -1) and a control (without spraying). Alive adults were sampled at 0, 2, 5 ou 6, and 12 or 14 days after application (DAA) of the insecticides in 12m (Maua da Serra) and 5m (Pinhao) os soybean row. In this last site, the initial stand of healthy plants and the number of plants attacked by the insect were also evaluated. Beta-cyfluthrin FW, fipronil (at the 3 tested doses), methamidophos and thiamethoxanwere efficient, reaching at least 80% of control until 5-6 DAA, inthe first experiment. Fipronil (at the 3 doses) and thiamethoxan were also efficient in the second experiment. According the data, the insecticides fipronil and thiamethoxan showed a larger residual power for controling S. subsignatus, providing a lesses final number of attacked plants.  aBrazil  achemical control  aInsecta  aintegrated pest management  apesticides  aControle Químico  aInseto  aPesticida  aBrasil  aControle integrado de praga1 aHOFFMANN-CAMPO, C.B.  tIn: INTERNATIONAL CONGRESS OF ENTOMOLOGY, 21., 2000, Foz do Iguassu. Abstracts... Londrina: Embrapa Soja, 2000.