This study was conduced with trees of pears Garber (Pyrus communis x Pyrus pyrifolia). The aim of this work was to examine the effects of growth regulators substances as gibberellic acid (GA3), naphthaleneacetic acid, aminoetoxivinilglisine (AVG) and tidiazuron (TDZ) to increase the fruit set and to induce the parthenocarpy. During the period of full blossom, the bunches was pulverized with 13 different treatments: GA3 (50, 300, 500 mg.L-1), ANA (50, 100, 200 mg.L-1), TDZ (5, 15, 25 mg.L-1), AVG (50, 100, 200 mg.L-1) and a control treatment with water. The insect pollination, was controled in 50% of branches. It was determined the total number of fruits established, the average of fruits established per bunch, the weight of fruits and number of seeds per fruit. Between all treatments, the plants pulverized with TDZ, at a concentration of 15 mg.L-1, showed the highest number of fruits established and the highest average of fruits established per bunch. It was observed an increasing in the weight per fruit and the most intense color on plants with TDZ treatment. Pears that received TDZ treatments and those that presented less seeds per fruit showed greater deformity.
Pyrus sp.; plant growth regulators
