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Which nematode was reported as the first virus-transmitted (vector) nematode?

Question: Which nematode was reported as the first virus-transmitted (vector) nematode?

Options:

Longidorus sp.
Paralongidorus sp.
Xiphinema index
Trichodorus minor

✅Explanation:
In 1958, Hewitt, Raski, and Goheen reported that Xiphinema index transmits the Grapevine fanleaf virus (GFLV), marking the first documented case of a nematode acting as a virus vector. This discovery revolutionized the understanding of plant disease transmission and highlighted the importance of nematodes as vectors of plant viruses.
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