This work aimed to determine the periods of weed interference in 'Carioca' bean (Phaseolus vulgaris) during the dry season. The assay was conducted at the Experimental Farm of the Universidade do Estado de Sao Paulo-UNESP - Jaboticabal. The bean plants were sown under the conventional system. The experimental treatments consisted of two groups: in the first, the bean crop remained free of weed interference from emergence up to 10, 20, 30, 40, 50, 60, 70 days (the entire crop cycle). In the second, the bean crop remained under interference from the time of sowing up to the same periods previously described, totalizing fourteen experimental treatments. The experiments were arranged in a randomized block design with four replications. The weed community comprised thirteen species - with Alternanthera tenella, Blaenvillea rhomboidea and Cenchrus echinatus being the most prominent, accounting for 63.4% of the total. The period prior to weed interference (PPI) occurred up to 17 days after crop emergenceand the total period of interference prevention (TPIP) occurred up to 25 days after crop emergence. Weed interference throughout the crop cycle reduced 67% of its productivity.
Phaseolus vulgaris; competition; weed
