Fanleaf Degeneration is spread by which organism?

Fanleaf Degeneration is spread by which organism?

• A. Bacteria
• B. Fungi
• C. Nematodes
• D. Virus

Answer: (C)

Vector transmission of plant viruses is being tested here. Fanleaf degeneration is caused by grapevine fanleaf virus and related nepoviruses, and in grapevines the primary natural spreaders are plant-parasitic nematodes, especially Xiphinema index. These nematodes feed on vine roots, acquire the virus from infected plants, and transmit it to healthy vines during feeding. That makes nematodes the key disseminators. Bacteria and fungi can cause other diseases, but they aren’t the vectors for this condition, and the virus itself is spread specifically by those nematodes rather than moving through the plant system on its own.

Vector transmission of plant viruses is being tested here. Fanleaf degeneration is caused by grapevine fanleaf virus and related nepoviruses, and in grapevines the primary natural spreaders are plant-parasitic nematodes, especially Xiphinema index. These nematodes feed on vine roots, acquire the virus from infected plants, and transmit it to healthy vines during feeding. That makes nematodes the key disseminators. Bacteria and fungi can cause other diseases, but they aren’t the vectors for this condition, and the virus itself is spread specifically by those nematodes rather than moving through the plant system on its own.