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Silverleaf nightshade is one of the worst agricultural weeds on a worldwide basis. Improved understanding of its life cycle will be useful for weed management. This research showed that the growth and reproduction of silverleaf nightshade were affected significantly by the time of emergence. Plants (both root- and seed-generated) that emerged early in the growing season, such as in September or November (spring), were significantly taller and produced more biomass and fruit than plants that emerged in January (summer) and March (autumn). Delayed emergence resulted in a shorter vegetative phase and less fruit production. As a result, the silverleaf nightshade plants that emerged in September produced a large amount of seeds, while the plants that emerged later in the season did not flower. Thus, control of early-emerging plants is important. The dynamics of fruit production indicated that silverleaf nightshade fruit formed in December and peaked in March, which suggests that a control action is required before December to control the soil seed bank. [ABSTRACT FROM AUTHOR]

The article reports on the survey of 400 growers of maize, soybeans and cotton conducted in the United States to determine perceptions, experiences and management practices with glyphosate-resistant weeds. It discusses that 24% of northern growers and 39% of southern growers thought they had glyphosphate weed resistance on their farm. It infers that glyphosphate weed resistance is one of the primary problem for glyphosphate-resistant (GR) soybean and cotton planters. An overview on the glyphosphate-resistant weeds is presented.