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Selectivity of Euphorbia splendens to distinct herbicide classes in gardening weed management.

In order to evaluate the selectivity of Euphorbia splendens to different kinds of herbicides, three tests were developed in the experimental area of ESAPP/SP Model Farm (2001/2002). The treatments of the experiment 1 were (in e.a. or i.a.): glyphosate (1,44 kg.ha-1); sulfosate (1,44 kg.ha-1); ammonium-gluphosinate (0,48 kg.ha-1); paraquat (0,60 kg.ha-1); glyphosate + flumioxazin (1,44 + 0,06 kg.ha-1); glyphosate + carfentrazone-ethyl (1,44 + 0,06 kg.ha-1) and one check. In the experiment 2: carfentrazone-ethyl (0,12 kg.ha-1); 2,4-D (1,30 kg.ha-1); isoxaflutole (0,06 kg.ha-1); nicosulfuron (0,06 kg.ha-1); metsulfuron-methyl (0,0024 kg.ha-1); lactofen (0,180 kg.ha-1); chlorimuronethyl (0,02 kg.ha-1); bentazon (1,25 kg.ha-1) and one check. In the third experiment were tested: fluazifop-p-butyl (0,25 kg.ha-1); sethoxydim (1,25 kg.ha-1); haloxyfop-methyl (0,06 kg.ha-1); clethodim + fenoxaprop-p-ethyl (0,11 kg.ha-1); quizalofop-p-ethyl (0,10 kg.ha-1); clethodim (0,12 kg.ha-1); propaquizafop (0,12 kg.ha-1); tepraloxydim (0,40 kg.ha-1); butroxydim (0,10 kg.ha-1) and one check. In the experiment 1, none of the treatments were selective, causing visible phytointoxication damages starting from 7 days after application. In the Experiment 2, only metsulfuron-methyl presented selectivity to E. splendens, for leaves and inflorescences levels, being isoxaflutole, nicosulfuron, chlorimuron-ethyl and bentazon inappropriate treatments just for flowers preservation. In the third experiment, all treatments showed selectivity to E. splendens, occuring damages on inflorescences level only for fluazifop-p-butil, sethoxydim and propaquizafop herbicides.

ISSN: 2447-536X

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