Leek rust is always worst in wet years, and noth last summer and this saw the heavy rain which spreads the spores.
Consulting an 'expert' at a Northern leek show, we were told to spray with dilute washing up liquid. However, I did notice that this expert's leeks were also badly affected by rust, so it couldn't be that effective!
After reading everything I could lay my hands on, we went for the following experimental policy:
- Watering, whenever possible, in the morning (NOT the evening) so the leaves dried off and didn't sit damp.
- No high-nitrate fertiliser, just balanced poultry manure when planting.
- Regular feeding with seaweed extract (Maxicrop, available from the Trading Store) with a sprinkler so it coated the leaves as well as soaking the roots.
Result? The best leeks we've had in years and very much less rust!