It was aimed at in this work to evaluate the population dynamics of yellow nutsedge (Cyperus rotundus L.) and of other species of weeds at maize (Zea mays L.) crop also cultivated for grain and for silage, under no-tillage and conventional tillage of the soil conditions. In the first year, the maize was cultivated in total area, being half of the area in no-tillage and the other half in conventional tillage. Later each area was splitted in two plots: one […]

In 2004, abnormalities in the formation of potato tubers were observed in the region of Casa Branca and Aguaí, São Paulo State, Brazil, due to the contamination of sprayer tanks with sulfonylurea. Most of the tubers from all plants presented many cracks and other deffects that disqualified them commercially. Potato response to simulated tank contamination of three sulfonylurea herbicides was evaluated in pot studies in Águas da Prata, São Paulo State, Brazil. Metsulfuronmethyl, nicosulfuron and sulfometuron-methyl were applied in post-emergence […]

The phytotoxicity level caused by hormonal herbicides that work as growth regulators in wheat plants is associated with the growth stage of the apical meristem. Applications of such herbicides when wheat plants are at double ridge and at terminal spikelet stages are very unlikely to cause damage to the ear and to the grain production. So, it is necessary to determine precisely the stages of plant development for having a secure use of these herbicides. However, small alterations may occur […]

Glyphosate is a broad spectrum herbicide, used for more than 15 years in apple orchards in the Vacaria-RS region for vegetation management on the crops row. In general, 3-4 glyphosate applications are done in each crop cycle with the normal herbicide rate of 720-1,080 g e.a. ha-¹ . Lolium multiflorum is a frequently found weed specie in orchards and regularly sensible to glyphosate. Biotypes of Lolium multiflorum resistant to the glyphosate did not show any significant glyphosate symptoms. Clethodim is […]