Eficiência do fungicida carboxin + thiram no tratamento de sementes de amendoim

Fungicide seed treatment is a cheap insurance for peanut seed producers and growers. Correct fungicide use can contribute to better performance of the propagation material, increasing the yield. The objective of this research was to evaluate the efficiency of carboxin + thiram and the viability of the use of vegetable oil and an organo-sillicone based surphactant as fungicide vehicle for seed-borne fungi control. Two doses of carboxin + thiram (50 + 50 and 70 +70 g a.i./100 kg seeds) prepared in water, plus one dose ( 50 + 50 g a.i./100 kg ) mixed with the vegetable oil and the surphactant were tested. The evaluation was based on seed germination and vigour and further field establishment of the crop. It was verified that the most important benefits of seed treatment were the significative reduction of dead seeds and the pre-emergence damping-off. Both doses of fungicide prepared in water were efficient for the control of seed-born pathogens, except for Rhizopus sp. The vegetable oil and the surphactant provided better covering and adherence of the fungicide to seeds, increasing the efficiency for the control of Aspergillus spp and Penicillium spp. No phytotoxic effect of the fungicide and the vehicle agents was detected on the peanut seeds.