Growth and reproduction of triazine-susceptible and -resistant Solanum nigrum in a maize crop

Growth and berry production of triazine-susceptible and -resistant Solanum nigrum L. in the field with and without a maize crop were studied over 3 ye ars. Delayed transplanting reduced the final dry matter production and berr y production greatly. In most of the experiments, the final total dry matte r production and berry production of the triazine-resistant biotype were lo wer than those of the susceptible biotype. However, relative growth rates o f both biotypes in a maize crop were similar during the exponential growth phase. One important determinant of final dry matter and berry production c ould be dry matter growth in the very young seedling phase. Although dry ma tter production and reproduction of the resistant biotype in a maize crop w ill be lower than that of the susceptible biotype in the absence of the sel ecting herbicide, management strategies to control resistant biotypes of S. nigrum should not only be based on this characteristic.