Grub eating through the roots of my bulbs? Help

warrengkApril 30, 2011

I have some haemanthus in the ground and when i went to dig them up to add some new soil, i noticed that some bulbs were eaten through the middle and there was a grub inside, but this wasn't the big grubs that you find in the lawns, it was way smaller and had like a black pen dot for an eye. So i placed the ones that were fine in bayer advanced grub control and let them sit in it for awhile, then i planted them all in pots just to be safe, well i was looking through some pots today and there was one little grub eating through some of the roots, and it was small and had a black dot for an eye. So what is this? what am i doing wrong? I used brand new kellogg potting soil and a lot of perlite. I checked the rest of the pots and no grubs, so i am letting the new bulbs sit in the bayer advanced grub control again. And i also watered the remaining pots with the mixture, and then i watered them again just to be safe. so am i doing anything wrong, what can i do to prevent this?

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warrengk

i looked at some photos online and i think its the onion fly! the larave look just like the ones i found on my bulbs!

    Bookmark   April 30, 2011 at 3:57PM
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Chemocurl zn5b/6a Indiana(zone 5/6)

It sounds like it might be the Narcissus Bulb Fly, which attacks not only Narcissus, but numerous others bulbs too. The link below tells about it, and yes, the grubs are a lot smaller than those found in the lawn.

From the link below:
"The Narcissus bulb fly is large and usually attacks a bulb as a single or a few individual maggots. The primary area of attack is in the basal plate. Then the larvae will move up into the bulb to feed. Bulbs infested with this fly will rot over the next winter. If they are not completely killed, the following spring will produce very weak, spindly foliage and no flower"

Here is a link that might be useful: The Narcissus Bulb Fly / Lesser Narcissus Bulb Fly

    Bookmark   May 1, 2011 at 10:21AM
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