There are other instructions that come with that list of insecticides including:
"Most of these products target adults or intercept
the pest before they enter the plant.
Proper application timing is key to product
efficacy."
Yeah, because once a borer is inside a plant, it is protected.
The exception is the systemic mentioned, imidacloprid, a neonicotinoid, harmful to the bees visiting the flowers and slow to break down.
If it were me, I would cut them down as soon as I saw signs of mining or plant trap crops to pull up and throw out as they became infected with the larvae. Also, call your extension center and find out how common they are in your area. I read the nurseries in Southern California have passed the moth around. It is disappointing but around here, we have Scarlet Lily Beetle. I had many lilies and they were the highlight of the garden during their bloom time. At one point, it wasn't worth it for me anymore and I let the lilies go. Fortunately, there are many other things to grow.
