Disease cycle in onion?

Question

Disease cycle in onion?

Answer 1

The onion allows the downy mildew fungus ans several fungi to complete their disease cycles.

   The downy mildew fungus can rest in perennial varieties and in infected onion bulbs left in the field and in cull piles. Resting sexual spores may persist in the soil to infect seedling onions planted the following season. During the onion growing season the fungus produces spores that are carried by wind to infect new onion plants.

     After the fungus is established, it completes its life cycle in 11 to 15 days. New spores infect new plants or leaves.