Many empty eggs, and what about the black ones?

weed30September 2, 2012

It's been a bad year for butterflies - last year I raised over 60 black swallowtails. This year I have had less than a dozen. Yesterday I found a dozen or so new eggs on my rue, very happy about that. However I found at least a dozen or more "empty" eggs...perfectly shaped but clear with nothing inside. I read here before that the butterflies don't know they aren't viable, just laying anyway.

This year I have gotten a number of black eggs too. At first I thought they were previously overlooked, and ready to hatch. But nothing ever happened. Then I realized they were way too black...swallowtail eggs don't get that dark before hatching. Anyone have the same thing or know what's going on?

Thank you for reporting this comment. Undo
misssherry(Z8/9SE MS)

I don't know why some eggs are black, but I've seen it here and there often through the years, especially with giant swallowtail eggs. I get more clear, empty eggs from the giants, too. Neither the black ones or clear ones hatch and make a caterpillar, though.
'Sorry! :(


    Bookmark   September 3, 2012 at 10:46AM
Thank you for reporting this comment. Undo

Drat it! I hope you get some viable ones, too!


    Bookmark   September 3, 2012 at 9:02PM
Thank you for reporting this comment. Undo

wow! Record numbers of black swallowtail here in Virginia. Was checking in to find info on eggs not hatching. Thought they might have been infertile, and seems that is one possible cause. Still have many that are hatching though. Ample monarchs, painted ladies, sleepy orange's, and some zebra's. GREAT butterfly year here.

    Bookmark   September 4, 2012 at 1:28PM
Thank you for reporting this comment. Undo

and these fun guys too! Harris's 3-spot - Harrisimemna trisignata

    Bookmark   September 4, 2012 at 1:34PM
Thank you for reporting this comment. Undo

burrowing. master carpenter.

    Bookmark   September 4, 2012 at 1:36PM
Thank you for reporting this comment. Undo

One year later.....

My BSTs were late arriving this year, but I've had a good amount of them, so I'm happy. However I'm also getting those empty eggs again. I have never seen so many - a couple dozen this year. It's sad, and I wonder if the mosquito spray our county insists on spraying is making some butterflies infertile. Just pondering.

    Bookmark   September 15, 2013 at 9:40AM
Thank you for reporting this comment. Undo
terrene(5b MA)

Do you find the empty eggs immediately after laying? I have found a few clear looking eggs from time to time, and thought it was because a predator insect might have sucked the inside of the eggs out. Not sure??

Thank goodness our town doesn't spray for mosquitoes any more, it is a horrible practice IMO. Although they have found mosquitoes that tested positive for West Nile virus in our area this year, I still think blanket spraying poison all over the environment is ridiculous.

    Bookmark   September 16, 2013 at 3:07AM
Thank you for reporting this comment. Undo

Come to think of it, I found a few clear eggs like that too, along c a lot of viable ones.

    Bookmark   September 16, 2013 at 8:19AM
Thank you for reporting this comment. Undo
KC Clark - Zone 2012-6a OH

Earlier this year, I had a black BST egg that I looked at everyday under a microscope. I could tell changes were taking place inside the egg. A little hole eventually showed up in the shell so something ate its way out. The egg was still black. Wish I had had it in a test tube so I might have been able to observe what emerged.

I recently found two more but did not bother to keep track of them.

    Bookmark   September 16, 2013 at 9:14AM
Sign Up to comment
More Discussions
Forum changes due to Houzz
I'm never happy when somebody buys up a website I use...
KC Clark - Zone 2012-6a OH
This stuff is hard
I have a ten acre prairie restoration that I have made...
rollie me ID these guys:-)
Hello! I am currently here in. Tampa, Florida, took...
Starting to look good in the south U.S.A....
Yesterday and today I saw butterflies here in my "yard". Actually...
Found a tagged Monarch today
It was on some Milkweed flowers. I could see a white...
Sponsored Products
Brasher Iron Coat Hook - Black Powder Coat
Signature Hardware
Pagoda Solar 6000K 3.2 Watt LED Black Wall Light
Lamps Plus
Curio Cabinet
Cost Plus World Market
Elk Lighting Claremore Curio Cabinet - 6042317
$518.00 | Hayneedle
Black Textured Outdoor Wall 2-Light Fluoresce
Contemporary Indoor/Outdoor Area Rug: Artistic Weavers Rugs Bargello Rust 8 ft.
Home Depot
Adagio Inspiration Falls Fountain w/ Black Featherstone in Rustic Copper Finish
Black and Brass 19" Wide LED Piano Lamp
Lamps Plus
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™