Abstract

GRIJALBA, P.E  and  RIDAO, A. Del C. Control químico de Pythium spp. en plántulas de soja. RIA. Rev. investig. agropecu. [online]. 2017, vol.43, n.1, pp.67-71. ISSN 1669-2314.

Pythium rot in soybean may appear from seed germination to the middle of the growing season. Effective control of four fungicides applied preventively in soybean was evaluated. These seeds were placed in plastic trays containing commercial substrate tyndallizated, inoculated with Pythium. Two trials were conducted A) Based on fungicides recommended for this disease in Argentina: metalaxyl-M and carbendazim + thiram and B) Based on fungicides widely used in Argentina: azoxystrobin and difenoconazole but not for seed treatment. The treatments were assigned to experimental units (trays) according to a completely randomized design with three replicates per treatment. After 21 days the incidence per pot was evaluated and the percentage of control of each fungicide was calculated. The results were analyzed by analysis of variance and the means were compared using the DGC Test with a significance level of 5%. Metalaxyl presented approximately 100% control while for carbendazim + thiram it was only 4.30%. The application of both azoxystrobin and difenoconazole differed significantly from metalaxil (61% and 28.80% control respectively). Chemical control of Pythium rot in soybean seedlings was more effective with the implementation of preventive fungicide metalaxyl with respect to the other three fungicides tested.

Keywords : Fungicides; Metalaxil; Oomycetes; Seed treatment; Glycine max L.

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