Seed treatment and storage for seed sanity of 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.