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Sternechus subsignatus (Boheman) é um curculinídeo que ocorre em algumas lavouras da região tradicional de cultivo da soja no Bras1 (RS, SC e PR). Durante a safra de 1990/91 em Cruz Alta - RS, num Latossolo Vermelho Escuro distrófico, textura argilosa, com 4 anos de semeadura direta de soja avaliou-se o efeito dos seguintes métodos de preparo do solo na infestação e no dano deste inseto T1) PD = plantio direto T2) PC + PD = plantio convencional em julho e plantio direto a partir de outubro; T3) PD + PC = plantio direto até julho e plantio convencional a partir de outubro; T4 PC = plantio convencional em julho e outubro. Os resultados mostraram que os métodos de preparo do solo influenciaram o estabelecimento e a atividade de S. subsignatus e, conseqüentemente, a produtividade das plantas de soja, a qual é diminuída no solo preparado com plantio direto e aumentada no solo com arado e grade. Sternechus subsignatus (Boheman) is a curculionid occurring in some fields of the traditional soybean production área in southern Brazil. During the 1990/91 growing season, in Cruz A1ta - RS, in an Oxissol (Dark-Red Latossol), clay texture, after four years of soybean cultivation under no-till. the effect of the following soi1 tillage methods on the insect infestation and damage were evaluated: T1) NT = no-till. T2) CT + NT = conventional tillage in July and no-till after October; T3) N T + CT = no-till until July and conventional tillage after October; T4) CT = conventional tillage in July and October. Results demonstrated that the soil tillage methods influenced the establishment and activity of S. subsignatus and, in consequence, the productivity of soybean plants decreased in the soil under no-till and increased in the soil under conventional tillage (plowed and disk arrowed)

Efeito de diferentes métodos de preparo do solo na infestação e danos de Sternechus subsignatus (Boheman) em soja