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Pesquisou-se, na região de Jundiaí, SP (23°8'S), a influência das épocas de poda drástica na diferenciação floral dos pessegueiros Tropical' e 'Aurora-2', conduzidos em alta densidade de plantio (1.667 plantas por hectare). Realizaram-se tais podas em 30 de setembro, 30 de outubro e 30 de novembro de 1986. Coletaram-se as gemas para análise mensalmente, a partir do 30° dia da poda: constatou-se, através de cortes histológicos das gemas, que a poda drástica precoce, de 30 de setembro, não prejudicou a diferenciação floral dos pessegueiros, que se iniciou em fevereiro, a cerca de cinco meses da decepa; em abril, a maioria das gemas de flancos encontrava-se com as sépalas, as pétalas, os estames e o pistilo completamente formados. As demais épocas de poda interferiram no processo de diferenciação floral, reduzindo o número de botões florais e, conseqüentemente, a densidade florífera das plantas. Nos pessegueiros conduzidos com poda normal, a organogênese floral, processada no início do verão (dezembro-janeiro), persistiu até o outono (abril). This paper reports the effect of three different dates of severe pruning on floral differentiation of peach trees of the cultivars Tropical and Aurora-2, conducted on a meadow orchards system. The peach trees were pruned in 1986, at the 30th day of September, October and November. The experimental plots were located at the Experiment Station of Jundiaí, (23º08'S), Instituto Agronômico de Campinas, State of São Paulo, Brazil. The lateral buds of the peach tree branches were first collected for analysis at the 30th day after pruning and on a monthly basis afterwards. Through histological studies made on longitudinal sections of the buds, it was observed that the severe pruning of September 30th, did not change the peach tree reproductive development The floral differentiation began in February, i. e., five months after pruning and produced sequentially: the petals, sepals, stamens and pistil. In the other severe pruning dates, the floral differentiation was reduced, decreasing the flower-buds quantity. In the control peach trees, without severe pruning, the floral organogenesis normally occurred from January to March. The floral induction began, probably, in early summer (December) and persisted until fall (April)

O pessegueiro no sistema de pomar compacto: III. Épocas de poda drástica na diferenciação floral