FUNGICIDE EFFICIENCY ON DRY BEAN (Phaseolus vulgaris L.) SEEDS TREATMENT ON Rhizoctonia solani Kuhn CONTROL
JOÃO ALMIR OLIVEIRA, MESSIAS JOSÉ BASTOS DE ANDRADE E ANTÔNIO CARLOS FRAGA
This study was conducted to evaluate different fungicide effects on seed Phaseolus vulgaris L. dry beans treatment in Rhyzoctonia solani Kuhn control. Dry beans Carioca cultivar were artificially contaminated by R. solani grown in PDA (Potato Dextrose Agar) medium. After contamination, seeds were submitted to fungicide rates in grams of active ingredient (GAI/100kg of seeds): Captan 25% (125g), Captan 75% (150g), Carboxim-Rhodiauram (175g), Benomil (50g), Thiram 70% (105g), and as check treatments were used contaminated and no contaminated seeds with no fungicide treatment. After treatment application seeds were submitted to following testes: healthy seed, standard germination, germination in controlled lab conditions in trayt, field seedbed (with soil + sand) emergence, and field emergence. All fungicides were efficient as compared to contaminated check treatment. They reduced characteristic R. solani contamination lesions in the standard germination test in tray and in field seedbed. The magnitude effects varied according to test and evaluated characteristic. Fungicides neither differ as seed germinating power nor as field seedbed emergence. In relation the field stand at 15 day, were significant but with small magnitude.
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