So is an annual release of Nematodes each April where the daffodils are planted a good plan?

I'm curious of others who have had a problem with Narcissus Bulb Fly Larvae destroying their daffodil bulbs if they've tried Nematodes and any stories they can tell.

Thanks!

I've attached a link from one of our local extension services that addresses this problem. It might be helpful.

From what I've read it's pretty predictable time of year in spring when the narcissus bulb fly lays eggs and the larvae travel down to the bulbs so if the nematodes are released prior to this sounds to me like a good plan.

Beneficial nematodes need warm soil temperatures to regenerate and start feeding, usually around 50F. This generally does not occur in the Puget Sound area until late May, so the timing of this control may be off slightly as well as questions about its effectiveness. And at $20 something a pop for the nematodes, it is kind of an expensive proposition that may or may not have any benefit. Again, after more than 30 minutes of online research, I didn't turn up a single hit that posed nematodes as a control agent for this problem.

FWIW, the flies are typically present in this area in late spring. Promptly removing the dried, spent foliage, especially of early blooming narcissus, should go a long way to control bulb fly damage.