03627naa a2200205 a 450000100080000000500110000800800410001910000170006024501230007726000090020052029620020965300110317165300240318270000170320670000210322370000230324470000170326770000210328477301160330511281562018-12-17       2018    bl uuuu     u00u1 u    #d1 aFAGUNDES, E.  aPLANT GROWTH REGULATORS ON CANOPY MANAGEMENT OF CABERNET SAUVIGNON GRAPES UNDER ANTI-HAIL NETS.h[electronic resource]  c2018  aControl of the vegetative growth of deciduous fruit plants has been a major concern of producers for many years. The vigorous growth of the aerial part negatively affects the quality of the fruits due to the reduction in the distribution of the light inside the canopy necessary to improve the fruit color, besides making difficult to handle diseases. In this context, the adequate balance between the vegetative and reproductive development of the plants can maximize the productive efficiency and fruit quality in temperate fruit plants. In recent years, research results indicate the feasibility of using growth regulators in canopy management, making it possible to reduce the amount of plant material, especially the shoot, allowing the translocation and use of photoassimilates for leaves and fruits. Inhibitors of gibberellin synthesis and ethephon can be used for this purpose in various fruits, but information on grapevine cultivation is limited. The objective of the work was to evaluate different growth regulators in the control of vegetative development and increase in the yield of 'Cabernet Sauvignon' vine. The experiment was carried out in a vineyard located in Videira, Brazil (27??06'67"S, 51??14'86"W and at an average height of 1,000 m), in the 2017/2018 crop year, using the cultivar Cabernet Sauvignon, Vitis vinifera L., with 5 and 6 years old, grafted on 'VR 043-43' rootstocks. The following treatments were tested: 1. Check (untreated plants) ; 2. Trinexapac-ethyl (TE) - 100 ml.100 L-1 at full bloom (FB); 3. TE - 100 ml.100 L-1 at 75 (days after full bloom - DAFB); 4. Prohexadione calcium (PCa) - 28 g.100 L-1 at full bloom (FB)+ 28 g.100 L-1 at 15 DAFB; 5. PCa - 28 g.100 L-1 at 75 DAFB + 28 g.100 L-1 at 90 DAFB; 6. PCa - 74 g.100 L-1 at full bloom (FB); 7. PCa - 28 g.100 L-1 + Etefon 100 ml. 100 L-1 at 75 DAFB; 8. Naphthalene acetic acid (NAA) ? 3,3 ml. 100 L-1 + Etefon 100 ml.100 L-1 75 DAPF. A randomized complete block design with six replicates of one plant per plot was used. Data were analyzed by one-way ANOVA. For multiple comparison procedures between means, Skott Knott tests (α = 5 %) were performed using SISVAR 5.0 program. There were no differences between treatments regarding: shoot length, number of clusters per plant, number of berries/cluster and cluster length, fresh and dry mass of rachis, soluble solids content and total acidity. All growth regulators, when applied 75 DAPF, increased yield per plant while PCa and TE applications, in full bloom, reduced the size and mass of the berries when compared to the control. The application of PCa 75 DAPF also reduced the pH of the juice (3.04). Under current experimental conditions, the product was not effective in reducing vegetative growth, however, when applied at veraison increased yield per plant. The results of this study demonstrate promising effects of ethylene treatments, with higher production and no reduction in berries quality.  aGrowth  aProexadione Calcium1 aPETRI, J. L.1 aHAWERROTH, F. J.1 aKRETZSCHMAR, A. A.1 aADRIELEN, C.1 aGARDIN, J. P. P.  tIn: WORDLD CONGRESS OF VINE AND WINE, 41., 2018, Punta Del Este. Abstracts... Punta Del Este: OIV, 2018. p. 437