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Author Topic: Too Early for Narcissus Bulb Fly?  (Read 522 times)

Jon_Paddick

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Too Early for Narcissus Bulb Fly?
« on: April 07, 2023, 02:39:34 PM »
Hello, first post here and Iím hoping someone can offer advice. I believe I have an issue with Narcissus Bulb Fly in the garden, I had large pot of Hymenocallis littoralis that I was repotting the other week and all the bulbs contained larvae and Narcissi only seem to come back reliably in shady areas, those in full sun tend to disappear.  Iíve seen a couple of dark coloured hover flies in the garden today (sunny still weather) and despite trying to catch/swat one they have evaded me. They wonít stay still long enough to be photographed either. The RHS advised theyíre active from mid May to June so itís a bit early but not being an entomologist I was hoping someone could offer some advice. My thought was to spray pesticide (which I donít like using but needs must if Iím to protect rare/valuable plants) at the base of the foliage in the hopes that it would get any of the eggs/larvae and invest in a big fishing net to try to catch some of the adult flies. Iíve looked at other posts but havenít seen anything in them emerging this early. Iím in southern England btw. Iíd be incredibly grateful for any advice.

partisangardener

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Re: Too Early for Narcissus Bulb Fly?
« Reply #1 on: April 08, 2023, 08:35:22 AM »
I had last year my first sighting of this "lovely" hoverfly end of March. This year none yet.
They come earlier than past years and I had them in summer too. Systemic insecticides after the flower onto the lower parts of subceptible plants should do what you want. The first sightings in my case were in mating mode. It took some weeks until I saw the first searching between Galanthus and Narcissus.
Plants kept indoor might broaden the season too.

They prefer the sunny site.
« Last Edit: April 08, 2023, 12:43:17 PM by partisangardener »
greetings from Bayreuth/Germany zone 6b (340 m)
Axel
sorry I am no native speaker, just picked it up.

 


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