Question

Black stem rust of wheat, a highly destructive fungal disease causing severe yield losses, is caused by which pathogen, and which plant serves as its alternate host in completing its life cycle?

A Puccinia recondita; alternate host — Thalictrum
B Puccinia graminis tritici; alternate host — Berberis vulgaris
C Ustilago tritici; no alternate host
D Tilletia indica; alternate host — none
E Puccinia striiformis; alternate host — unknown
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