The lightning-fast spread of leaf miners can be almost solely attributed to sellers of daylilies that either don't know they have them or know they have them but do not treat for them. The majority of photos seen (that include foliage) on Facebook show leaf miner tracks, with some of the worst afflicted plants being sold by some of the sellers.
A few days ago I was viewing photos taken at an AHS display garden and the leaves in most photos were riddled with tracks! A display garden!
This year, there has been a huge increase in people posting photos of foliage showing leaf miner tracks and asking "what's this on my daylily?"
Last year one person made the statement, "What's the big deal? Everybody has them." I take great offense to this kind of thinking because not everybody has them and I doubt anyone wants them.
Infected plants are being shipped with little concern about the spread of leaf miners. I applaud anyone who takes steps to rid their garden of them. If a person has a few, without taking steps to combat them, leaf miners will increase in numbers until tracks are seen everywhere.
