Manejo do mofo branco na cultura da soja pela aplicação de herbicidas

Abstract

Soybean culture has great importance for the Brazilian economy. The occurrence of the fungus Sclerotinia sclerotiorum can generate significant losses, impacting between 30 to 100% of the soybean production. In this way, the study of efficient controls is necessary, as well as the use of alternative forms of management pathogen. As regards the alternative control, the research of induction of resistance caused by herbicides has been studied. Thus, the work aims to search herbicides which induces of a defense by plants in the development of the fungus in soy. The experiment was developed in the city of Coronel Domingos Soares-PR, with cultivar BMX Energia, making applications at the stadiums V4 (fourth node, third trifoliada leaf fully developed) and Vn (Nth node, ante-enésima trifoliada leaf fully developed), for herbicides and R1 +15 days for the fungicide. In field trials, seeds per pod, pods per plant and there was no statistical difference, as well as for the production of grain, MMG was significant, in that treatment T8 (Lactofen. V4 + Vn), was higher than T3 (Bentazon V4), but this not differing from the rest. In the evaluation of incidence and severity, the treatment T7 (Bentazon V4 + Vn) obtained better control, with 38.75%, followed by T4 (Lactofen V4), from 38.35 percent in severity, differing only of T1 (water, witness), with 0% of control. To the incidence there was no statistical difference, due to the high inoculum pressure in the experimental area.