The Possibility of Residual Herbicide Application in Late Planted Bean Seed Crop

The field experiment was conducted at the experimental field of the Institute for Vegetable Crops Smederevska Palanka in Smederevska Palanka, Serbia. Beans were planted on July 1st 2024, after which herbicides were applied. The goal of this study was to evaluate the efficacy of 5 treatments and their crop selectivity. Herbicides used in this study were 1) dimethenamid-P 864 g a.i. ha-1 plus flumioxazin 40.8 g a.i. ha-1; 2) dimethenamid-P 864g a.i. ha-1 plus metobromuron 1000 g a.i. ha-1; 3) aclonifen 1800 g a.i. ha-1 plus metobromuron 1000 g a.i. ha-1; 4) clomazone 96 g a.i. ha-1 plus metobromuron 1000 g a.i. ha-1 plus dimethenamid-P 720g a.i. ha-1. Visual efficacy and crop injuries were rated on every 7 days after treatment (DAT), whereby 21 DAT weed density and biomass were measured. Weed species present in the study were Ambrosia artemisiifolia, Hibiscus trionum, Polygonum lapathifolium and Portulaca oleracea. By using Tukey test, all treatments showed statistically very significant differences compared to control. The best efficacy (100%) on all 4 weed species was reached in treatment clomazone 96 g a.i. ha-1 plus metobromuron 1000 g a.i. ha-1 plus dimethenamid-P 720 g a.i. ha-1. Treatment aclonifen 1800 g a.i. ha-1 plus metobromuron 1000 g a.i. ha-1 showed lovest efficacy in P. oleracea control. All treatments showed excellent efficacy in H. trionum control. Visual crop injuries were only observed in treatment dimethenamid-P 864 g a.i. ha-1 plus flumioxazin 40.8 g a.i. ha-1 due to application of flumioxazin. Crop injuries were visible 14 DAT, but not 21 dat. Based on this research, all treatments can be applied in Galeb bean variety which was planted in this study, but the choice should be based on the weed spectrum.