
The US army conducted field experiments of biological weapons, which could harm rice cropping, in the island of Okinawa in the early 1960s, according to Kyodo news agency. The same experiments were also conducted on the US mainland and in Taiwan, Kyodo said, citing US military documents it said it had obtained. In the tests conducted at least a dozen times between 1961 and 1962, rice blast fungus was released over rice fields and data was collected on how it affected rice production, Kyodo said. Rice blast disease causes lesions to form on the plant, threatening the crop.
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