Plant growth regulators to increase fruit set and yield of 'Rocha' pear trees in Southern Brazil.
Abstract. The aim of this study was to evaluate the effect of different aminoethoxyviniglycine (AVG), thidiazuron (TDZ) and prohexadione calcium (P-Ca) rates sprayed at different timing on fruit set, yield, and fruit quality of 'Rocha' pear trees in different climatic conditions of Sothern Brazil. The study was performed in two commercial orchards located in Sao Joaquim, SC, (2015/2016) and Antonio Prado, RS (2016/2017). Plant material consisted of 'Rocha' pear trees grafted onto Pyrus calleryana and quince roorstock 'BA29' in Sao Joaquim and Antonio Prado, respectively.