Resumo

ROCHA-ARROYO, José Luis; SALAZAR-GARCIA, Samuel  e  BARCENAS-ORTEGA, Ana Elizabeth. Irreversible determination to flowering for 'Hass' avocado in Michoacán. Rev. Mex. Cienc. Agríc [online]. 2010, vol.1, n.4, pp.469-478. ISSN 2007-0934.

The aim of this study was to specify periods in which occurs irreversible determination to flowering in apical bud of vegetative sprout for winter, spring and summer flows in avocado orchards with and without irrigation set under four climatic conditions. The study was carried out during 2006-2008, in six commercial orchards for avocado 'Hass' in State of Michoacán, Mexico. In each orchard 20 trees were selected and in each one 30 sprouts of each vegetative flow were labeled. Treatments consisted on girdling and defoliation of a sprout per tree every fifteen days for each vegetative flow. Localitites climate, influenced on the date in which occurred irreversible determination to flowering in sprouts of the three vegetative flows, it occurred earlier in temperate climate than in warm. After emergence, the sprouts of winter flow required more time to reach the irreversible determination to flowering than of spring and summer flows. The irreversible determination to flowering in winter, spring and summer flows sprouts it occurred from May 30 to July 23, from May 28 to September 26 and from June 10 to September 15, respectively, and from 29 to 42 days earlier in orchards without irrigation. In floral development scale, the number of irreversible determined to flowering buds ranged from 3 to 4 in winter sprouts, from 3 to 5 in spring and from 1 to 4 in summer.

Palavras-chave : Persea americana Mill.; bark girdling; climates; defoliation; phenology.

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