USDA: Planted Acreage Increases, Prices Slip (WEAT; CORN; MOO)

Yes, those are ETF symbols.
Corn and wheat are now down fractionally.
From Agriculture.com:
USDA releases bearish data

The U.S. farmers planted a lot more corn acres in 2011 than the trade expected, according to the USDA Thursday. In its June Acreage and Quarterly Grain Stocks Reports, the government released very bearish data.

The Early Calls for commodities for Thursday's trade are as follows: Corn 30 cents (daily limit) lower, soybeans 20-25 cents lower, and wheat to follow, according to the CME Group floor traders.

For corn, the USDA's estimate of 92.3 million acres is above the average trade estimate of 90.776 million and below the March estimate of 92.178 million.

USDA estimates the 2011 U.S. soybean acreage at 75.2 million, vs. the average trade estimate of 76.476 million and its March estimate of 76.609 million.

In its report, the USDA sees the U.S. 2011 All Wheat acreage at 56.4 million vs. the average trade estimate of 56.607 million and its March estimate of 58.021 million....MORE

 From the Houston Chronicle:
Farmers plant more corn, could slow food inflation

That's the way ag commodities work. Prices go up and more acreage gets planted. Corn trades at a premium to wheat and the farmers see a 'gold' rush in corn.