Incidence of the Fusarium Semitectum and Phomopsis Sp. in Soybean Seeds Lots.

Soybean (Glicyne max (L.) Merrill) is infected by a large number of fungal diseases. These are considered very important because they cause damage in seeds quality and productivity, also it has the seed as a vehicle for spreading. The aim this study was to evaluate Fusarium semitectum and Phomopsis sp incidence in soybean seed lots of cv BRS Torena. The experiment was conducted in the laboratory of Seed Technology and Pathology of UNESP in Jaboticabal, SP. The experimental design was completely randomized with four replications, and the analysis of seed pathology performed by the method of filter paper (blotter test), with 200 seeds per replicate, using germination regulated at three different temperatures (20, 22 and 25 °C) with readings at seven, 14 and 21 days. The incubation temperatures and the incidence were similar to Fusarium semitectum. In increasing time of evaluation, significant increased incidence of infection. The incidence of Fusarium semitectum was 36.7% (20 °C), 37.6% (22 ºC), 41.3% (25 °C), 26.3% (seven days), 31.1% (14 days) and 57.5% (21 days). In relation  to Phomopsis sp., lowest incidence percentages was observed in lower and higher temperatures. For the intervals, there was less impact on the readings taken earlier, at seven days, (22.0, 29.8 and 23.8% incidence at 20, 22 and 25 °C, respectively, and 12, 7; 28,6, and 34.4% at seven, 14 and 21 days. The seeds rating infected by Phomopsis sp decreased to 21 days, possibly due to excessive growth of F.semitectum that may have "masked" the evaluation.