科研之友
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摘要
O objetivo deste trabalho foi avaliar a efic芍cia da termoterapia no controle de fungos associados a sementes de cumaru (Amburana cearensis A.C. Smith) de duas localidades, ap車s tratamento t谷rmico e qu赤mico. A avalia o da sanidade foi realizada pelo m谷todo de incuba o em papel filtro (Blotter Test) e a qualidade fisiol車gica das sementes pelos testes de germina o e condutividade el谷trica. O tratamento t谷rmico utilizado foi por imers o em 芍gua aquecida a 60～C por 0, 5, 10 e 20 min. e o tratamento qu赤mico foi feito com o fungicida Captan. Utilizaram-se 100 sementes por tratamento (dez sementes por placa de Petri), as quais foram incubadas, por sete dias, 角 temperatura de 22 ㊣ 2oC e fotoper赤odo de 12h. A avalia o qualitativa e quantitativa (expressa em porcentagem) dos fungos associados 角s sementes foi realizada com aux赤lio de microsc車pio estereosc車pico. Nas amostras examinadas, constatou-se apenas a incid那ncia do fungo Aspergillus niger. Houve maior incid那ncia de A. niger no lote da localidade Catol谷 do Rocha, Estado da Para赤ba, sendoa incid那ncia do fungo muito baixa na localidade Petrolina, Estado do Pernambuco. Os tratamentos que apresentaram melhor resultado foram o fungicida e a termoterapia por 20 min. The objective of this work was to evaluate the effectiveness of thermotherapy in the control of fungi associated with seeds of cumaru (Amburana cearensis A.C. Smith) from two localities, after thermal andchemical treatment. The health assessment was conducted by the method of incubation on paper filter (Blotter Test) and physiological quality seeds was determined by germination tests and electrical conductivity. The thermal treatment was used by immersion in waterheated to 60 degrees for 5, 10 and 20 minutes. The chemical treatment was done with Captan fungicide. The study used 100 seeds per treatment (10 seeds per petri dish), which were incubated for seven days, at a temperature of 22 ㊣ 2～C and 12-hour photoperiod. Thequalitative and quantitative assessment (expressed in percentage) of the fungi associated with the seeds was done with the help of a stereoscope. In the examined samples, only the Aspergillus niger fungus was found. There was a higher incidence of A. niger in the lot from the town of Catol谷 Rocha, Para赤ba State, with very low incidence of the fungus in the town Petrolina, Pernambuco State. The treatments with the best results were fungicide and thermotherapy for 20 minutes.
