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A soja, Glycine max (L.), e uma cultura que pode ser prejudicada por insetos-praga durante todo o ciclo fenologico, principalmente nos estadios iniciais  desta cultura. O objetivo deste trabalho foi avaliar a resposta da cultura da soja a diferentes tipos de injurias artificiais causadas nos seus estadios iniciais de desenvolvimento. O experimento foi conduzido na area experimental da Embrapa Agropecuaria Oeste, utilizando-se as cultivares FTS Campo Mourao e BRS Potencia, as quais foram submetidas aos seguintes tipos de injurias iniciais: 1) Remocao de um cotiledone; 2) Remocao de dois cotiledones; 3) Remocao de dois cotiledones e uma folha unifoliolada; 4) Remocao de dois cotiledones e duas folhas unifolioladas; 5) Remocao de uma folha unifoliada; 6) Remocao de duas folhas unifolioladas; 7) Corte abaixo das folhas unifolioladas; 8) Corte do broto trifoliado; 9) Testemunha (sem injuria). A altura das plantas, o numero de vagens/planta e o peso verde da parte aerea da cultivar FTS Campo Mourao foram menores quando comparado com os valores desses parâmetros obtidos na cultivar BRS Potencia. Foi tambem constatado reducao na altura das plantas de soja nos tratamentos 3, 4, 6 e 7 quando comparado a testemunha. O rendimento de graos (Kg ha-1) foi semelhante nas duas cultivares e nao foi influenciado pelos diferentes tipos de injurias causados nas plantas. Ja o peso de 100 sementes (g) foi maior na cultivar FTS Campo Mourao quando comparado a cultivar BRS Potencia. Independente dos tipos de injurias que sao causadas, as plantas apresentam capacidade de recuperacao ao dano. Effect of Different Types of Injury Caused During the Early Soybean Development Stages Abstract. The soybean, Glycine max (L.), is a crop that can be damaged by insect pests throughout its phonological cycle, particularly in the early stages of development of this culture. The aim of this study was to evaluate the response of soybean to different types of artificial injuries caused in its early stages of development. The experiments were carried out at Embrapa Agropecuaria Oeste using the cultivars FTS Campo Mourao and BRS Potencia. These cultivars were submitted to nine treatments of artificial injuries, as follow: 1) removal of one cotyledon; 2) removal of two cotyledons; 3) removal of two cotyledons and one unifoliate leaf; 4) removal of two cotyledons and two unifoliate leaves; 5) removal of one unifoliate leaf, 6) removal of two unifoliate leaves; 7) cut below the unifoliate leaves; 8) cut below the trifoliate bud; 9) untreated (without injury). The plant height, the number of pods/plant and fresh weight of aerial part in Campo Mourao cultivar were lower than that observed with the Potencia cultivar. There was also reduction of the plant height in the treatments 3, 4, 6 and 7 when compared to the control (without injury). The grain yield (Kg ha-1) was similar in both cultivars and was not influenced by the different types of injuries applied in plants of both cultivars. The weight of 100 seeds (g) was higher in cultivar Campo Mourao when compared to Potencia cultivar. Regardless of the types of injuries that are caused, the plants have resilience to damage.

Efeito de Diferentes Tipos de Injúrias Causadas nos Estádios Iniciais de Desenvolvimento da Soja