Now for more hungry caterpillars. This is Datana ministra, in the same genus as
the Major in the previous post.
I found this species feeding on a small Blackjack Oak,
Quercus marilandica. It was evident from
quite a distance that this tree had seen caterpillar damage. Many of the upper branches were left with
nothing but stout petioles where there should have been leaves.
The caterpillars are all final instar and have spread
throughout the tree. They are numerous enough
to defoliate an oak of this size. I made
a count of nearly 50 individuals and may have missed a few.
Body size and shape is nearly identical to D. major, but the
coloration is not nearly as bright. The
body is basically black with several yellow lines.
This species is commonly called the Yellow-necked
Caterpillar. Yellow just behind the head
along with this showy orange patch are responsible for that designation.
These caterpillars displayed an interesting feeding
strategy. A pair would team up, with
members of the pair working opposite sides of the leaf. The result is a leaf that still retains its
balanced shape. Many predators search
out caterpillars by targeting irregularly shaped leaves resulting from
caterpillar feeding activities. Synchronized
feeding helps hide the fact that the leaf is being consumed.
The effects were not always perfect, but the result usually
looked much like a naturally formed leaf.
This pairing was not an isolated incident. Many feeding pairs were found on the tree.
The pair would feed until there was no leaf left and then
would back down the petiole and move off to another leaf.
Of course, the plan was not always executed perfectly. When three caterpillars end up on the end of
the same stalk it begins to get silly.
We should stop here before things get out of hand.
Happy Birthday to Sarah and Sophie
20 hours ago
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