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Which one of the following proved effective for biological control of nematodal disease in plants?

1. Pisolithus tinctorius
2. Pseudomonas cepacia
3. Gliocladium virens
4. Paecilomyces lilacinus

Correct answer: Paecilomyces lilacinus

Solution

Paecilomyces lilacinus is a well-known nematophagous fungus used in biological control because it attacks nematode eggs and females, reducing nematode populations. The other options are associated with different types of biocontrol or symbiosis, not nematodal disease control in plants.

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