Qualidade sanitária de sementes de mamona (cv. IAC-226)

The objective of this work was to evaluate the fungicides efficacy on the castor seeds IAC-226 sanitary quality. The seeds were treated with two doses of the fungicides captan (250 and 300 g ai 100 kg -1 seed), thiophanate-methyl (100 and 150 g ai 100 kg -1 seed) and thiabendazole (100 and 150 g kg ai 100 seeds). Seeds without fungicide treatment were the control. The seeds sanitary quality was evaluated by sanity test, using 10 replications of 20 seeds per treatment/lot, superficially sterilized (sodium hypochlorite) and placed in plastic boxes (gerbox) with filter paper and sterilized distilled water, under controlled temperature 25°C for 20 days. Seeds were examinated individually using a stereoscopic microscope and optical microscope. The results were expressed as percentage of infected seeds. The experimental design was completely randomized in a factorial arrangement (2 x 7), two lots and seven treatments, with ten repetitions. The fungicides captan, tiabendazol and tiofanato-metilico reduced the incidence of fungi, being recommended for the castor seeds IAC226 treatment. There was a predominance of fungi Alternaria alternata, Aspergillus flavus , Aspergillus niger, Bipolar, Botrytis ricini, Curvularia sp., Penicillium sp. and Rhizopus sp.