At least 48 cases have been reported as of June 30, the agency said.
Herridge asked the court to stay a decision fining her $800 a day until she reveals her confidential source for a story about an FBI investigation.
David Hearn was indicted in Washington on one count of property destruction related to an incident that occurred on June 19.
Fertilizer prices have spiked significantly since the war with Iran started at the end of February.

After ‘full-blown shopping’ Brown and lots of debate over his true value, Boston finalizes a trade with Philadelphia for Paul George and four picks.
The proposed changes would make it harder for federal regulators to impose new energy-use limits on household appliances and equipment.
The arrests mark the second major federal enforcement operation in the area in less than a year.
Six of the 10 cities are in central California, while the other four cities are in Texas.
Newsom’s office said Claude will be used to help state workers draft and summarize documents as well as analyze information.
NHTSA said the reported incidents did not cause vehicles to leave their lanes or significantly increase the risk of a crash.

A federal judge previously found the company flouted her injunction against anticompetitive business practices.
The proposed changes are expected to make it easier and faster to build new nuclear reactors.
‘While he’s there, I said you can declassify whatever you want,’ the president said.
Temperatures in numerous places will exceed 100 degrees, forecasters said.
The comment from officials in Tehran comes as U.S. and Iranian negotiators pursue a permanent peace deal through Qatari mediators in Doha.
Melat Kiros’ victory marks a major upset and follows on the heels of a string of democratic socialist candidate victories in House races in New York.
Sen. John Hickenlooper (D-Colo.) will face a veteran Republican lawmaker in the general election.
The suspects in the indictment were responsible for at least 333,000 deadly doses of fentanyl flowing into Minnesota’s communities, officials said.
‘I am not sure that today’s opinion will stand the test of time,’ the justice added in a 91-page dissent.
Justices disclose annually the income they receive from sources such as teaching and book royalties.
Democrats square off to face Republican incumbent in ’toss-up' congressional district while party rivals battle for November berth to succeed Gov. Jared Polis.