Amaryllis and Narcissus bulb fly


Does anyone here have any knowledge of Amaryllis (Hippeastrum) and Narcissus bulb fly?
I own several Amaryllis plants and I like to put them outside in the summer to build themselves up in the better light. Many years, too many of them are destroyed or severely damaged by a plump larvae that I believe to be from Narcissus bulb flies. It's odd that I don't seem to notice of my white narcissus missing. They are growing just several yards from where I place the Amaryllis and are chronically over crowded. Daffodils growing elsewhere in the yard also seem to come back just fine every year.
Still, I believe Narcissus bulb fly to be my problem. (Does anyone have another idea?) I'm thinking I might be safe putting them out later in the season, like maybe August. Where I live, the Narcissus are just now having their leaves turn brown. Maybe in another 3 weeks, the bulb flies will have finished the adult phase of their life cycle and the Amaryllis would be safe? That would still give them a couple of months before frost.
Does anyone here know enough about this to confirm or correct my ideas?
Steve (in the Adirondacks of northern NY)
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Steve wrote:

Well, it looks like I'm on my own with this question. I think what I'll do is take some outside tomorrow and take the rest out on August 1st. If the early ones get infested but not the later ones, that will tell me what to do in the future. If none of them get infested, I'll try earlier dates next year. The early ones will be duplicates or less favorite ones just in case they get ruined.
Steve PS If you are shy about posting and want to contact me directly, I'm really at adelphia dot net.
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Steve wrote:

By the way, I was just looking at the narcissus leaves. They are laying flat to the ground but mostly still green. No wonder the bulb flies stay active so long.
Steve
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