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First-generation corn borers to affect 12 m ha in China

First-generation Asian corn borers (Ostrinia furnacalis) are expected to affect some 12 million ha of maize crops in China this year, reports China's National Agro-tech Extension and Service Center (NATESC). The number of borers per hundred stalks was up by 15.3% on the historical average to 47.2 in the province of Anhui in the spring. There were increases in Hubei, up 52.3% to 36 borers/100 stalks, Henan (+0.7% to 21.1), Shanxi (+27.9% to 26) and Xinjiang (+58.8% to 77.1), but numbers were down in most other parts of the country. The NATESC predicts “medium” levels of corn borer infestation for this year. Corn borer outbreaks have been predicted to occur nationwide, affecting a total 25 million ha of crops this year (Agrow No 681, p 19).

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