Revista Brasileira De Herbicidas 2002; 3(1): 39-44
Postemergence broadleaf herbicide selectivity in cassava
DOI: 10.7824/rbh.v3i1.370
The main management problem in the cassava crop in due to interference by weeds, where they bring about root yield reductions. Inexistence of selective postemergence herbicides, makes weed control only possible with preemergence herbicides or through hand hoeing. The objective of this research was to evaluate broadleaf herbicide selectivity when applied postemerg.ence on cassava plants. An experiment was carried out at University of Rio Grande do Sul, Brazil, using 10-liter volume pots, where four cassava cuttings were planted. The experimental design used was a completely randomized one, with five replications. The tested herbicides were: acifluorfen, bentazon, fomesafen, byspiribac, chlorimuron, imazethapyr, nicosulfuron and linuron. The variables evaluated were herbicide injury at 4, 8, 14 and 28 days after treatment application (DAT), and shoot dry weight at 14 and 18 DAT. Nicosulfuron was selective for cassava when applied at an early growth stage, significa~tly different from the other treatments as far as biomass production is concemed, constituting a promising option for selective broadleafweed control in this crop.
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