Controle de plantas daninhas na cultura da ameixa carmesin (Prunus salicina) através do uso de herbicidas com ação residual em pós emergência

Abstract

In the order to verify the effect of some combinations of herbicides for weed control in plum orchards, afield experiment was carried out in 1986, in Bela Vista do Paraíso, Pr. The experiment was designed in randomized blocks with 12 treatment and four replication blocks. The treatment and the respective rates in kg. of a.i./ha were: 1. Weeded check; 2. weedy check; 3. glyfhosate + diuron (0,57 + 1,20); 4. glyphosate + diuron (0,95 + 2,00); 5. glyphosate + simazine (0,145 + 1,140); 6. glyphosate + simazina (0,579 + 2,40); 7, glyphosate + terbacil (0,75 + 0,625);glyphosate + terbacil (1,05 + 0,875); 9. MSMA + diuron (2,88 + 1,12) + surfactant 0,1% V/V; 10. MSMA + diuron (3,60 + 1,40) + surfactant 0,1% V/V; 11. paraquat + simazine (0,24 + 2,88) + surfactant 0,1%+ V/V; 12. paraquat + simazine (0,32 + 3,84) + surfactant 0,1% V/V. All were post emergence aplication. The weeds present in the area were Bruchiaria plantaginea, Digitada horizontalis, Setaria geniculata, Digitaria insularis, Altemanthera ficoidea, Bidens pilosa, Emilia sonchifolia, Hipoch^eris brasiliensis and Richardia brasiliensis in various development stages. The results showed no phytotoxicity symptons for the plants and were all efficient in controling Brachiaria plantaginea, Digitaria horizontalis, Setaria geniculata, Altemanthera ficoidea, Emilia sonchifolia and Richardia brasiliensis. Combination treatments of glyphosate showed the best control of Digitaria insularis, wich was the most resistent weed. For Bidens pilosa, except the combinations of glyphosate plus terbacil, all others were highly efficient. For Hipochaeris brasiliensis the best control was obtained from paraquat plus simazine and the combinations of lyphosate.