老叶首先脉间失绿呈嫩黄色或黄色，边缘不卷曲，在过早地裂开前白化并干枯，心叶和生长点能持续最长地周期。

Older leaves first affected with bright yellow - green or yellow interveinal chlorosis, inrolling of margins, wilting, bleaching and withering before dehiscing prematurely ;

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老叶首先脉间失绿呈嫩黄色或黄色，边缘不卷曲，在过早地裂开前白化并干枯，心叶和生长点能持续最长地周期。

Older leaves first affected with bright yellow - green or yellow interveinal chlorosis, inrolling of margins, wilting, bleaching and withering before dehiscing prematurely ;

youdao