In the northern area it is necessary to plant varieties which are outstandingly resistant to low winter temperature.

北部地区只能种植确实能抗冬季低温的品种。

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In the northern area, it is necessary to plant varieties which are outstandingly resistant to low winter temperature.

北部地区只能种植确实能抗冬季低温的品种。

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Consequently, the low winter temperature is the key factor confining the distribution and overwintering population base of this insect pest.

冬季低温是限制柑桔潜叶蛾分布和决定越冬虫口基数的关键因子。

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They will be closed only for short periods of time and only during the winter when the water temperature and light are too low for algal blooms.

ECONOMIST: Flood barriers