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Which of the following groups of nematodes is typically the most host-specific?

Question: Which of the following groups of nematodes is typically the most host-specific?

Options:

Meloidogyne (Root-knot Nematodes)
Cyst Nematodes (Heterodera, Globodera)
Citrus Nematodes (Tylenchulus semipenetrans)
Pulse Nematodes (Heterodera cajani)

✅Explanation:
Cyst Nematodes (Heterodera, Globodera): These nematodes are known for their high degree of host specificity. Each species of cyst nematode typically infects a narrow range of closely related plant species. For example, the soybean cyst nematode (Heterodera glycines) primarily infects soybean plants, while the potato cyst nematode (Globodera rostochiensis) is specific to potatoes.

🔑Key Points:
(a) Meloidogyne (Root-knot Nematodes): This group of nematodes has a very wide host range, infecting thousands of plant species, including many vegetables, fruits, and ornamentals.
(c) Citrus Nematodes (Tylenchulus semipenetrans): While citrus nematodes are primarily known to infect citrus trees, they have also been found on other plants, including grapevines and olive trees. Though their host range is narrower than root-knot nematodes.
(d) Pulse Nematodes (Heterodera cajani): These nematodes primarily infect legumes (pulses).

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