The rest of the summer, winter, and spring is spent as a prepupae inside the cocoon. When mature in mid July, the caterpillars crawl to the soil and spin a cocoon that incorporates soil particles. However, the caterpillars are covered with a thick, fluffy secretion that makes them look like nothing ever seen before! They feed in groups, which also contributes to their visual impact. Fully grown butternut woollyworm caterpillars are green with blackish spots and a black head.
The butternut woollyworm, Eriocampa juglandis, is actually a sawfly caterpillar (sawfly caterpillars have ten pairs of legs - a pair of legs on every segment - whereas moth and butterfly caterpillars have eight or fewer pairs of legs). The Butternut Wooly Worm is actually a Sawfly, Eriocampa juglandis.Description and Biology Skip to Description and Biology Seems someone on BugGuide also entertained the fungus idea. Found them while trying to see if the fly/wasp I sent matches any of their sawflies.
This looks a lot like the “Butternut Wooly Worm” images on bugguide.
Your second caterpillar is a Gypsy Moth Caterpillar.Ĭorrection: () Strange White Caterpillar from Oil City Pennsylvania The Cornell University Biological Control website has a photo of an infected Gypsy Moth Caterpillar. The Gypsy Moth Fungus, Entomophaga maimaiga, is an important biological control of this invasive species, and you can read more on the Country Gardener. In trying to research Fungus attacking Caterpillars, we found references to a fungus, Entomophaga maimaiga, that is host specific on Gypsy Moth Caterpillars, but it does not resemble the Fungus in the image you have provided. BugGuide has a big section on Fungus riddled Flies, but not one for caterpillars. It is difficult to determine the species of caterpillar from your photo. Your white caterpillar is, we believe, infected with Fungus that will probably kill it. The third picture I believe is the Gypsy Moth Caterpillar but just wanted to double check. I was hoping you could tell us what it is. There were 4 of them and I cannot seem to find it anywhere on your website or the rest of the Internet. Recently my fiance and I found this caterpillar (the first two pictures) on a small tree in our backyard in Oil City (Northeastern) Pennsylvania. First, I must say I love your website and check it regularly. I am resending this letter in hopes that you can help me identify the caterpillar we found in our backyard. I emailed you last week but just realized that you requested the location of the bugs found. Strange White Caterpillar from Oil City Pennsylvania
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