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The objective of this study was to evaluate the influence of different lengths of EM-9 interstock, on the production and fruit characteristics of Imperial Gala apples more than eight years old. This experiment was conducted in a commercial orchard located in Vacaria-RS, Brazil, situated at an altitude of 955 m , during seasons 2005/06, 2007/08, 2010/11, 2011/12 and 2012/13. The treatments consisted of five lengths of EM-9 interstock (10, 15, 20, 25 and 30 cm) connecting the Marubakaido rootstock to the Imperial Gala scion. For production efficiency a positive correlation between increased efficiency and the length of interstock was observed. Likewise a positive correlation was also noted for quality parameters of the fruit; firmness and classification (Category 1). From this study we conclude that a EM-9 interstock of 30 cm on Marubakaido rootstock is the most suitable for the vigor control of Imperial Gala apples, it ensures greater production efficiency and firmer fruit. Made available in DSpace on 2019-12-27T18:17:14Z (GMT). No. of bitstreams: 1 030058JoseLuiz.pmd.pdf: 510244 bytes, checksum: 619f27d5b1d38ad9908867e74db267a5 (MD5) Previous issue date: 2019

The aim of this study was to evaluate the efficacy of metamitron or metamitron plus benzyladenine as a post-bloom thinner on ‘Baronesa’ and ‘Fuji’ apples. Three experiments (rate, timing and BA combination) were conducted during two crop seasons, 2013/14 and 2014/15 at the experimental station located in Caçador, SC. Fruit set, fruit drop, yield per tree, fruit size and flowering return were assessed. The efficacy of metamitron was affected by time of application, and when applied at petal fall, promoted the proper adjustment of the production load of plants. Yield per plant reduces, whereas the allocation of fruits in categories of greater size increases proportionally to the increase in the metamitron concentration applied. However, there is excessive fruit drop with the use of high concentrations. The addition of BA to metamitron also promoted fruit drop; however, no difference was observed between single application of metamitron and BA addition. Metamitron shows great potential to be used as thinner for apples, since it reduces the number of fruits per tree. Index terms: Malus domestica, post-bloom thinning, fruit drop, return bloom, fruit quality. METAMITRON NO RALEIO QUÍMICO DA MACIEIRA O objetivo deste estudo foi avaliar o efeito de diferentes épocas e concentrações de metamitron e a mistura com benziladenina, no raleio químico em pós-floração das macieiras ‘Baronesa’ e ‘Fuji’. Foram conduzidos três experimentos durante as safras agrícolas de 2013/2014 e 2014/2015, no município de Caçador-SC. Foram avaliados: a frutificação efetiva, a queda de frutos, a produção por planta, a distribuição dos frutos em classes de calibre e o retorno de floração. A época de aplicação de metamitron influenciou a eficiência do produto, sendo que, quando aplicado na queda de pétalas, este promoveu o adequado ajuste da carga produtiva das plantas. A produção por planta reduz, enquanto a alocação dos frutos em categorias de maior calibre aumenta, proporcionalmente ao aumento da concentração de metamitron aplicada. No entanto, há queda excessiva de frutos com a utilização de concentrações elevadas. A mistura de metamitron com benziladenina, promove a queda de frutos, porém não há efeito aditivo entre a mistura e a aplicação individual de metamitron. O princípio ativo metamitron tem potencial para uso num programa de raleio químico em macieira, visto que reduz a frutificação. Termos para indexação: Malus domestica, raleio em pós-floração, queda de frutos, retorno de floração, qualidade de frutos Made available in DSpace on 2018-01-03T23:23:37Z (GMT). No. of bitstreams: 1 USEOFMETAMITRONASANAPPLETHINNER.pdf: 959472 bytes, checksum: 846a31657e2b3bc0f8a0160375f940e7 (MD5) Previous issue date: 2018-01-03