A rice farmer observes that his crop, planted in a field with standing water, develops small, water-soaked, translucent lesions on the leaf blades that quickly turn yellow and then dry up, and in severe cases, entire seedlings collapse and die within days. His neighbour, whose field is well-drained and does not remain flooded, does not report similar symptoms. Given that this disease is caused by a bacterium that spreads rapidly through standing water and enters the plant through wounds or natural openings, which disease is the farmer's crop most likely affected by?