Which one of the following disease not induce floral abnormalities

Answer: Option A

Downey mildew of mustard does not induce floral abnormalities whereas all the other diseases among the given options like Green ear of Bajra and white rust of crucifers induce floral abnormalities in them.
Downey mildew is caused by the fungus-like organism Peronospora parasitica. Infection occurs when soil-borne resting structures called oospores germinate and produce sporangia under moist, cool conditions. It affects leaves as light green or slightly chlorotic lesions that become yellow or necrotic after sporulation.