Luiz Ricardo Pereira

Tratamento de sementes com fungicidas relacionado com o controle de patógenos e rendimento de milho

Experiments were conducted in laboratory, green house and in the field in Passo Fundo, State of Rio Grande do Sul, Braul, under natural presence of pathogens. Com hybrids used were: Braskaib XL 561, and Braskaib XL 330 in 1994 and 1995 growing season, respectively. Treatments, with their concentrations of active ingredients, formulations and doses for 100kg of seeds were: untreated contrai; thiram 60 P + iprodione 20 P (150 + 50g): thiram 35 PM + carboxin 35 PM + metalaxyl 35 PM (150 + 700 + 100g), in 1994 and (thiram + carboxin) 20 SC + metalaxyl 35 PM (50g) in 1995; thiram 35 PM + carboxin 35 PM (100 + 100g), in 1994 and (thiram + carboxin) 20 SC (200ml) in 1995; thiram 70 P (150g); imawlil 5 L (150ml); captan 75 P + thiabendawle 10 P (150 + 100g); triadimenol 25 P (160g); captan 75 PM (150g) and metalaxyl 35 PM (100g) 1994 (50g) 1995. Fungicides were appiied by manually shaking 250 g of seed with the appropriate amount of each fungicide in a plastic bag. All chemical treatments showed efficiency in control ling Fusarium moniliforme. However, metalaxyl and captan were less efficient. Except for metalaxyl ali chemical treatments controiled Cephalosporium acremonium spp. Captan was less efficient than the other treatments in 1994 and showed efficiency to thisfungus similar to triadimenol and captan + thiabendawl in 1995. Ali treatments, except for metalaxyl and captan (in 1995, in the field), significantiy improved emergence. Thiram and its mixtures aiso provided the best contral of Penicillium spp and Aspergilius spp., and provided yield increasefrom 13,5% to 14,8% in 1994 andfrom 9,8% to 13.5% in 1995.