The stage-I of a rust pathogen consists of

A. Pycniospores

B. Aeciospores

C. Basidiospores

D. Urediniospores

Answer: Option B

Solution(By Examveda Team)

The stage-I of a rust pathogen consists of Aeciospores.
Rust fungi are obligate plant pathogens that only infect living plants. Infections begin when a spore lands on the plant surface, germinates and invades its host.
Aeciospores from Aecia. These serve mainly as non-repeating, dikaryotic, asexual spores, and go on to infect the primary host.