Which of the following is a wilt-resistant rootstock of guava?

Correct option is D

Psidium friedrichsthalianum , commonly known as the Costa Rican guava, is widely recognized as a wilt-resistant rootstock for guava cultivation.
Key Points:
· Guava wilt is a severe problem caused by fungal pathogens like Fusarium oxysporum and Nematodes that attack the root system, leading to heavy losses.
· Psidium friedrichsthalianum has shown natural resistance to wilt disease and is commonly used as a rootstock to graft commercial guava varieties ( Psidium guajava) for improved tolerance.
· It provides not just disease resistance but also results in a stronger root system, better adaptation to adverse soil conditions, and longer orchard life.
Other Options Explained:
· (a) Psidium guajava: This is the common guava plant itself and is susceptible to wilt under certain conditions.
· (b) Psidium benjamina: This is not a commonly used rootstock for guava; also not known for wilt resistance.
· (c) Psidium guineese: Also called Brazilian guava, it has some tolerance but is less resistant compared to Psidium friedrichsthalianum.