By Maximilian HeathBUENOS AIRES, Sept. 18 (Reuters) - Corn planting for Argentina's 2025/26 season advanced rapidly this week in the country's main agricultural areas ahead of storms forecast for this weekend, which would pause the work, the Buenos Aires Grains Exchange said on Thursday. Argentina is the world's third-largest corn exporter, and for the current season, the exchange estimates an area of 7.8 million hectares (19.3 million acres) will be planted with the grain - the second largest in the South American country's history. Regarding the 2025/26 wheat crop, the exchange said that while some regions are reporting cases of disease from excessive soil moisture, 97.1% of the 6.7 million hectares planted with the grain are in normal-to-excellent condition. Argentina's wheat harvest begins in November and ends in January. (Reporting by Maximilian Heath; Editing by Lisa Shumaker)