We'll see soon enough if Professor Kosako's "chaos" in the harvest season occurs when they start harvesting the major crop - regular rice (not the early varieties) in Tohoku.
From Asahi Shinbun (9/6/2011):
福島県は６日、同県南相馬市の果樹園で採取したクリから国の基準値（１キロあたり５００ベクレル）を超す２０４０ベクレルの放射性セシウムが検出されたと発表した。また、同市や出荷業者などに出荷の自粛を要請した。
Fukushima Prefecture announced on September 6 that 2,040 becquerels/kg of radioactive cesium was found from the chestnuts harvested at an orchard in Minami Soma City. The prefectural government requested the city and the wholesalers [of the city's chestnuts] to halt shipment voluntarily.
県は７日に同市以外の１１市町村でも緊急のモニタリング調査を実施する。同県の２００９年産のクリの収穫量は２６７トンで、出荷量は７７トン。
The prefectural government will conduct an emergency monitoring survey in 11 municipalities on September 7. Fukushima's chestnut harvest in 2009 was 267 tonnes, of which 77 tonnes were shipped outside the prefecture.
A "monitoring" survey means they will sample test.
The Fukushima prefectural government and the Minami Soma municipal government want the residents back in the city, with the promise that the government-led thorough decontamination will be carried out.