Mate (Ilex paraguariensis A. St.-Hil) is an arboreal species of great economic and socio-environmental importance, which presents difficulties in the adventitious rooting process. The rhizogenic competence of vegetative propagules of mate can be attained by coppicing, but the factors that influence the success of this technique have not yet been elucidated. Therefore, the aim of this study was to evaluate the effects of the stock plant, time of shoot collection, treatment with indolebutyric acid (IBA) and diameter of vegetative propagules in the adventitious rooting of cuttings from shoots induced by coppicing of selected adult plants of mate. Shoots produced from coppiced 13SM01 and 13SM05 stock plants were collected at different times of the year to prepare single-bud cuttings. The cuttings were measured as their diameter in the central portion and treated with 0 and 3000 mg L-1 of IBA. After 60 days, cuttings were evaluated to determine survival and rooting percentages, number of roots, and length of the three largest roots. A completely randomized design was used in a 4 × 2 × 2 × 13 (collection times x stock plants x IBA treatment x diameter classes) factorial scheme with 15 replications. Competence for adventitious rooting was highest for stock plant 13SM05. Cuttings collected in November and February had the highest rooting percentages, without the need of IBA treatment. Cuttings from 13SM01 and 13SM05 with diameters smaller than 0.636 cm (classes 1 to 6) and smaller than 0.712 cm (classes 1 to 7), respectively, had the highest rooting percentages and differed significantly from cuttings with larger diameters. Thus, the results of the present study indicate that stock plants, time of shoot collection, and diameter of vegetative propagules influence adventitious rooting competence of mate cuttings from coppicing adult plants. Rooting of mate cuttings with lower rhizogenic competence is influenced by the application of 3000 mg L-1 of IBA.

The objectives of this research were to evaluate the rooting competence of mini-cuttings throughout the four seasons and to estimate the adventitious rooting time of canjerana clones. A clonal mini-garden was established with 11 clones in a closed hydroponic system. Evaluations were performed throughout the four seasons for the number of mini-cuttings produced per mini-stump, percentage of survival and rooting of mini-cuttings, number of roots, average root length, and number of rooted mini-cuttings per mini-stump. Data were submitted to analysis of variance and means were compared. A rooting curve was estimated for clones 10SM05, 12SMI25, and 12SMI43 that exhibited high competence for adventitious rooting. Our results indicated that canjerana clones can be selected for adventitious rooting competence of mini-cuttings during different seasons, and that canjerana mini-cuttings should be cultivated for 63 days in a rooting chamber.

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Cassia fistula L., conhecida popularmente como chuva-de-ouro, é uma planta com características ornamentais e, por isso, muito empregada na arborização urbana, entretanto apresenta manchas foliares causadas por Colletotrichum gloeosporioides que podem comprometer o desenvolvimento da planta. Apesar da severidade da doença e dos danos causados, não há relatos de medidas de controle a serem aplicadas. Portanto, o objetivo deste trabalho foi avaliar o potencial efeito antagonista in vitro de Trichoderma spp. sobre C. gloeosporioides isolado de manchas foliares em chuva-de-ouro. Um isolado de C. gloeosporioides e quatro espécies de Trichoderma spp. foram utilizados. A capacidade antagônica de Trichoderma spp. foi avaliada por testes de confronto direto e de produção de metabólitos voláteis. Os isolados de Trichoderma spp., oriundos de formulações comerciais, foram eficientes no controle in vitro de C. gloeosporioides, por diferentes métodos de avaliação, e possuem potencial para pesquisas como agentes de controle biológico da antracnose em C. fistula in vivo. Em ambas as metodologias, o isolado de T. harzianum destacou-se no controle do crescimento do fitopatógeno.

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