02072naa a2200277 a 450000100080000000500110000800800410001910000140006024501250007426000090019952012500020865300280145865300180148665300180150465300250152265300160154765300160156370000160157970000170159570000130161270000160162570000180164170000180165970000210167777300960169811305852021-02-05       2021    bl uuuu     u00u1 u    #d1 aCARRA, B.  aPlant growth regulators to increase fruit set and yield of 'Rocha' pear trees in Southern Brazil.h[electronic resource]  c2021  aThe aim of this study was to evaluate the effect of different aminoethoxyvinilglycine (AVG), thidiazuron (TDZ) and prohexadione calcium (P-Ca) rates sprayed at different timings on fruit set, yield, and fruit quality of ?Rocha? pear trees in different climatic conditions of Southern Brazil. The study was performed in two commercial orchards located in São Joaquim, SC (2015/2016) and Antônio Prado, RS (2016/2017). Plant material consisted of ?Rocha? pear trees grafted onto Pyrus calleryana and quince rootstock ?BA29? in São Joaquim and Antônio Prado, respectively. Treatments consisted of AVG, TDZ and P-Ca sprayed at different rates and timings. Trunk crosssectional area increase, fruit set, thinned fruit, fruit per tree, yield, average fruit weight, projected yield, yield efficiency, fruit length, fruit diameter, L/D ratio, seed number, flesh firmness, and soluble solids content were assessed. Fruit set and yield were consistently increased by AVG in all experiments. Fruit set was not affected by P-Ca and was significantly decreased by TDZ. However, yield was positively affected by P-Ca 100 mg L ?1 sprayed at full bloom + 7 days after full bloom and TDZ 10 mg L?1 at full bloom. Fruit size was consistently increased by TDZ.  aaminoethoxyvinilglycine  afruit quality  afruitlet drop  aprohexadione calcium  aseed number  athidiazuron1 aPASA, M. S.1 aABREU, E. S.1 aDINI, M.1 aPASA, C. P.1 aCIOTTA, M. N.1 aHERTER, F. G.1 aMELLO-FARIAS, P.  tAnais da Academia Brasileira de Ciências, Rio de Janeirogv. 93, n. 3, p. e20180680, 2021.