Rotating doesn't really help against white rot..it can stay inactive in soil for 20 yrs..and just waiting onion or garlic to arrive and kick into action again.
What causes White Rot? anyone know? How might it have got into the garden?
It is fungal disease and can come into your garden via infected soil, plant material...or eventually spreading from neighbouring plots if they have it.
Rust' on the leaves, anyone suffered this fate before?,
yep..its quite common thingy..but often shows its 'ugly head' when somebody has been bit too liberal with fertilizer and created soft, lush growth that is easily infected by it.. ;)