Whats wrong with these onions

[richardw]

My climate is normally low humidity during summer,but the last five days we have had a weather system drag tropical air down over us so i dont know if thats the reason for what ever has effected my onions.Because its rare to get a lot of disease here i dont recognize it,anyone know what it is?

[raymondo]

Don't know Richard but it looks fungal.

[richardw]

Yes it does look fungal Ray but there's not many like that thankfully

[cesarz]

That is onion leaf blight Botrytis squamosa which exists only in NZ, and USA not in Aussie

[richardw]

Jan 2, 2014 3:52:54 GMT -5 cesarz said:

That is onion leaf blight Botrytis squamosa which exists only in NZ, and USA not in Aussie

Thanks Cesar,a Google search does show that thats what it is.

I read that -

number of lesions increased as the temperature rose from 10 to 20°C but decreased at 25°C

and

the number of lesions per cm2 of leaf area increased gradually with increasing leaf wetness duration from 12 to 72 h.

which the resent weather we had was perfect for the Botrytis.But interesting though,both the Pukehohe Long Keeper white and the red were hit but not the California red bulbil onions.

Now that weather is back to the normal lower humidity hopefully it wont get any worse.