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Beijing warned fall armyworms could damage hundreds, if not thousands of hectares of crops, leading to possible food security issues for the country.

To counter the pest, China has requested farmers in the 21 provinces to use government-approved pesticides.

The "heart-devouring worm" - as locals call it - has spread almost 1,900 miles north since migrating from neighboring Myanmar earlier this year, now threatens 21 provinces and regions in China and could heavily impact the country's grain output.

In Yunnan, a province in southwestern China, the pest has already destroyed 86,000 hectares of corn, sugarcane, sorghum, and ginger crops.
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