Minicutting Is an Efficient Method for Blueberry Propagation

Minicutting has been used for several woody species, presenting greater efficiency than propagation by conventional cutting due to its high yield of propagative material and higher percentage of rooting in minicuttings. This work was carried out to evaluate the efficiency of minicutting techniques for the ‘Bluegem’ blueberry and find the best concentration of IBA for rooting the minicuttings. The minigarden was installed in pots using micropropagated plants. Four collections of minicuttings were carried out between 27 October 2020 and 12 April 2021, and received the following treatments: 0; 2000; 4000; 6000; and 8000 mg L−1 of IBA. The minicutting was carried out in a mist chamber and evaluated after 60 days. The yield of minicuttings increased from the first to the third collection, decreasing in the fourth collection when the plants began to enter dormancy. The rooting of the minicuttings was influenced by the collection time and the application of IBA. Increasing IBA concentration increased the percentage of rooted minicuttings and root dry mass to concentrations close to 5000 mg L−1 on almost all collection dates. High concentrations of IBA reduced the percentage of sprouted minicuttings and leaf retention and increased mortality. It is recommended for the ‘Bluegem’ blueberry minicutting to apply 5000 mg L−1 of IBA.