RESUMO -Este trabalho teve como objetivo avaliar a tolerância de frutos de pessegueiro aos danos ocasionados pela geada. A geada ocorreu no dia 5 de setembro de 2006, sendo que a temperatura mínima, a 1,5 m do solo, foi de -1,06°C. Foram avaliados 28 genótipos de pessegueiro em diferentes estádios fenológicos. O delineamento experimental foi o inteiramente casualizado, com três repetições (plantas de pessegueiro), procedendo-se à avaliação em seis ramos por planta. No dia em que ocorreu a geada, foram mensurados o número de frutos por ramo, diâmetro sutural médio dos frutos, número total de gemas vegetativas, percentual de brotação e percentual de brindilas formadas a partir das gemas brotadas. Uma segunda avaliação foi realizada 15 dias após a primeira, para avaliar o percentual de queda de frutos e o diâmetro sutural médio dos frutos remanescentes. Genótipos bem enfolhados e cujos frutos apresentavam endocarpo endurecido, no momento da ocorrência da geada, foram tolerantes ao dano ocasionado pelo frio; frutos com diâmetro sutural inferior a 20 mm foram suscetíveis à geada, enquanto frutos com diâmetro sutural superior a 30 mm apresentaram boa tolerância, independentemente do genótipo avaliado. Termos para Indexação: danos por congelamento, danos por frio, frutificação, Prunus persica. FRUIT FROST TOLERANCE IN PEACHABSTRACT -The aim of this work was to evaluate the fruit damage tolerance in different peach tree genotypes after natural freeze. The frost happened on September 5, 2006, and the minimum temperature, 1.5 meters over soil, was -1.06°C. Twenty-eight peach tree genotypes, in different stages of development, were evaluated, in a completely random design, in three replication (plants) and six branches by plants. Immediately after frost, we measured the number of fruits per branches, average fruit suture diameter, percentage of sprouts and percentage of twigs in formation. A second evaluation was accomplished fifteen days after the first one in order to assess the percentage of fruit drop and the average remaining fruit suture diameter. Genotypes with good leafing and hard pit (endocarp) during frost have freeze tolerance; fruits with suture diameter lass than 20 mm are susceptible to frost damage, while fruits with suture diameter superior to 30 mm are tolerant.
Phenology and fruit set of peach cv. 'Granada' under different orchard managementsPeach cv. Granada produces for dual purpose: fruits are firm and have good size and appearance. However, this cultivar has been showing low yields, especially when temperatures are above 25 °C during the dormancy period and flowering time. Thus, this study aimed to evaluate different management practices on the phenology and fruiting of this cultivar. The experiment was arranged in a randomized block design with four replications, two plants per plot and 10 one-year-shoots per plant. The following treatments were tested: T1 -control treatment (management practices adopted by the fruit-grower); T2 -girdling the trunk; T3 -short pruning of the one-year-shoots (twigs with two nodes); T4 -Kaolin at 3.5 % of active ingredient; T5 -Hydrogen Cyanamide (0.75 %) + mineral oil (1 %); T6 -girdling of the trunk combined short pruning of one-year-shoots; T7 -trunk girdling + Hydrogen Cyanamide (0.75 %) + mineral oil (1 %); T8 -short pruning + Hydrogen Cyanamide (0.75 %) + mineral oil (1 %); T9 -ringing of the trunk + shortRecebido para publicação em 21/03/2012 e aprovado em 21/08/2012.
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