Seed treatment and storage for seed sanity of paineira (Chorisia speciosa St. Hil) / Tratamento de sementes e armazenamento na sanidade de sementes de paineira (Chorisia speciosa St. Hil)

ABSTRACT

The objective of the present paper was to evaluate the chemical treatment and storage time for seed sanity of paineira (Chorisia speciosa St. Hil). Seeds which were collected from trees at UEL-Campus with natural humidity of 12,89% were treated with Kodiak C at the dosages of 15, 30, 60g for each 100kg of seeds, carboxim-thiram 200SC at the dosage of 250ml for each 100kg of seeds, carboxim-thiram 200SC at 250ml+Kodiak C at the dosage of 15, 30 and 60g for each 100kg of seeds. After treatment the seeds were kept in paper bags type Kraft and storage in laboratory conditions at ±23 ºC and 48% of relative humidity. For sanity evaluation at 0, 30, 60, 90, 120 days it was used the filter paper method using 200 seed for each treatment. The lowest percentage of microorganism was observed on the seeds treated with the mix of carboxim-thiram+Kodiak C at 15g/100kg of seeds 30 days after treatment. Out of the treatments the identified fungi were Fusarium sp., Aspergillus sp., Alternaria sp., Colletotrichum sp., Penicillium sp. The storing time favored the incidence of Aspergillus sp., Colletotrichum sp., Penicillium sp., and the others were not altered.

RESUMO

O objetivo do trabalho foi avaliar o tratamento fúngico e tempo de armazenamento na sanidade de sementes de paineira (Chorisia speciosa St. Hil). Sementes colhidas de árvores em desenvolvimento no Campus-UEL, com umidade natural de 12,89% foram tratadas com Kodiak C nas doses de 15, 30 e 60g para cada 100kg de sementes; carboxim-thiram 200SC na dose de 250ml para cada 100kg de sementes; carboxim-thiram 200SC na dose de 250ml+Kodiak C nas doses de 15, 30 e 60g para cada 100kg de sementes. Após tratadas, as sementes foram acondicionadas em sacos de papel tipo Kraft e armazenadas em condições de laboratório a temperatura de ±23ºC e UR do ar 48%. Para as avaliações da sanidade, aos 0, 30, 60, 90 e 120 dias empregou-se o método do papel de filtro, utilizandose 200 sementes por tratamento. O menor percentual de incidência de microrganismos foi observado nas sementes tratadas com a mistura carboxim-thiram+kodiak C na dose de 15g/100kg de sementes aos 30 dias. Independente do tratamento, os fungos identificados foram Fusarium sp., Aspergillus sp., Alternaria sp., Colletotrichum sp., Penicillium sp. O tempo de armazenamento favoreceu o aumento da incidência de Aspergillus sp., Colletotrichum sp., Penicillium sp., enquanto os demais não se alteraram.