Currently viewing the category: "Leaf Skeletonizers"
What's That Bug? does not endorse extermination

Found on grapevine in Southern AZ
Location: Southern Arizona SE Tucson PIma county
August 3, 2011 3:18 pm
We have an infestation of what seem to be caterpillars. They start out very small and grow to be pretty hearty looking caterpillars with light green/yellow, and purple bands. They are only on the grape vine in the backyard and have not gone to any other plant in the yard. I hate to harm them but they are killing the vine. Any idea what they may be? Thank you!
Signature: Thankful for your time, Ashley Goode

Western Grape Leaf Skeletonizers

Hi Ashley,
We believe you would be justified in removing these Western Grape Leaf Skeletonizers,
Harrisina metallica, from your grape vine.  According to BugGuide:  “Adults emerge and lay eggs on leaves soon after bud-break in spring. Early instars feed gregariously on undersides of leaves which they skeletonize. Later instars spread out and may defoliate entire vineyards. Several generations per year.”

What's That Bug? does not endorse extermination

Help identifying unknown caterpillar
Location: Rockledge, FL
November 17, 2010 5:41 pm
While clearing overgrown grape vine within a nature preserve we had found numerous small caterpillars around 0.5 cm in size. They suspend themselves on silk strands when threatened. Can you help in identifying them. We can’t seem to locate them in our books.
Signature: Brandon Smith, Environmental Program Coordinator

Grapeleaf Skeletonizer

Hi Brandon,
Sorry for the delay.  We researched this when you sent the image, but then we got waylayed and never posted the response.  Though the markings are a bit different, we believe this is a Grapeleaf Skeletonizer,
Harrisina americana, which is pictured on BugGuide.

What's That Bug? does not endorse extermination

The truth is out there – 07.05.10
May 6, 2010
Hi Daniel,
Greetings once again from sunny Phuket.
How are you ?
Some staff of mine have run into this curious little oddity and asked me if I could assist in identifying it.
To me it’s clearly alien – possibly from alpha centuri or the crab-stick nebula. Its no surprise that a week after Stephen Hawkins informs us that aliens are amongst us that we find him (her, it or them).
What do you think ?
With kind regards,
Mark.

Mystery: Caterpillar we presume

Hi Again Mark,
How is the Atlas Moth population doing?  We presume this is a caterpillar, but that is just a guess.  It surely is a strange looking creature.  We haven’t the time to research this at the moment, but we hope our readership will kick in and assist. Read Full Post →

What's That Bug? does not endorse extermination

Beautiful Blue Bug
Sun, May 10, 2009 at 1:44 PM
These blue fellows showed up in late April, proceeded to make a love shack of my grapevines, and disappeared shortly after. A couple of weeks later my vines are covered with these cute, little yellow and black caterpillars. I’m assuming the two are related but I can’t seem to find them on any of the internet searches I’ve done.
Thanks for any info, Rebecca
Mesa, AZ

Western Grape Leaf Skeletonizer

Western Grape Leaf Skeletonizer

Hi Rebecca,
We are so happy to have your photos of the adult moth as well as caterpillars of the Western Grape Leaf Skeletonizer, Harrisina metallica , in the same letter.  According to BugGuide it is:  “Native to southwestern USA and northern Mexico. Occurs from California to Texas, north to Colorado and Utah ” and “Larvae are a severe pest in some California vineyards.”  A very similar species, the Grape Leaf Skeletonizer, Harrisina americana, is found in the eastern U.S.

Western Grape Leaf Skeletonizer Caterpillars

Western Grape Leaf Skeletonizer Caterpillars

What's That Bug? does not endorse extermination

little worms on grapevine
I think you guys are great. I would love to know what these little worms are. They really don’t seem to move, but I’ve found evidence that they’ve been around. Where did they come from and do they need to be destroyed or do they turn into something good? I found them on my grapevine. Thanks,
Lois Cain

Lois
These caterpillars are Grape Leaf Skeletonizers, Harrisina metallica. The caterpillars are a major defoliator on grape vines.

What's That Bug? does not endorse extermination

Whats this?
Hy, I am Don from Franklin, La, and I have a second year growth of Thompson White Seedless grape vines that have and still has this pocket of caterpillars, they start with a group of egg pockets cluster about the size of a quarter and grow to small caterpillars and eat away at the leaves, I sprayed with daconil and also use seven dust (which is better) than daconil. What is it and what is the best control? I also saw a leafhopper.
Don

Hi Don,
These are Grapeleaf Skeletonizers, Harrisina americana. The caterpillars will eat the leaves to the veins. We don’t provide extermination advice.

What's That Bug? does not endorse extermination