Soyoil futures jumped 3% after Washington accused Argentina and Indonesia of dumping in their $1.5bn biodiesel exports to the US – price gains that according to Rabobank could herald larger rises to come. Soyoil futures for July touched 33.47 cents a pound in Chicago before easing back to 33.13 cents a pound in late morning deals, a gain of 1.9% on the day.