Wholesale prices rose 1.8% in June, after seasonable adjustments, with energy prices gaining 6% and food prices rising 1.5%, the Labor Department reported Tuesday. Economists polled by MarketWatch had expected the producer price index to rise 1.4%. In the past year, the PPI gained 9.2% -- the largest change since June 1981, the government said. June's core PPI -- which excludes food and energy prices -- rose 0.2%, while economists had expected a 0.3% rise. In the past year, core prices rose 3%.