Citrus tristeza virus (CTV) exists in the form of mixed infection, so it is necessary to differentiate the strains by using some technical methods.

柑橘衰退病毒(CTV)存在严重的株系混合侵染现象，因此需要用一定的方法对混合株系进行识别。

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Citrus tristeza virus (CTV) has a number of distinct strains differing in biological characteristics in citrus fields.

柑桔衰退病毒(CTV)存在着许多生物学特性不同的株系。

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