seen from Mexico
seen from United States
seen from Singapore
seen from United States
seen from Brunei
seen from Argentina
seen from Brunei
seen from China
seen from United States
seen from Australia
seen from Malaysia
seen from Brazil
seen from United States
seen from United States
seen from Brunei
seen from Brunei
seen from Brunei
seen from Brunei
seen from United States
seen from Argentina
Bug of the Day
Found this walnut caterpillar in the driveway, it was not in great condition so I gave it its Glamour Shots session and let it go by a small walnut sapling in my yard. The next day, in the same driveway spot, there were at least 5 more of them. They probably all came from the same nearby walnut tree.
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Datana sp. (by me)
Yellow-necked caterpillars (Datana ministra), Newark DE. July 2018. Another gregarious feeder, yellow-necked caterpillars often emerge in summer in orchards, forest edges, and backyards where their host plants (apple, birch, oak, and willow) are present. At young instars (molts), they skeletonize leaves, with the leaf veins being the only parts that remain. As the caterpillars mature, they consume every part of the leaf, down to the stem, often leaving bare branches in the end. However, the trees do recover, and by August, the oak trees had young, tender leaves growing from where the yellow-necked caterpillars once fed.
Two generations in the Northeast, adults in June, caterpillars late June onward into September, and caterpillars overwintering as pupae.
Bug of the Day
Absolutely gorgeous moth, Datana sp.
Walnut Caterpillar Moth, Datana integerrima (by me)
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Bug of the Day
Nice specimen of a Datana sp. at the moth light! From July 2017.
Yellow-necked caterpillars (Datana ministra), Newark DE. August 2017. Caterpillars that eat and molt together in large groups, the yellow-necked caterpillar can have explosive populations that defoliate trees in suburban neighborhoods or parks, such as apples, oaks, and willows. Many species of Datana are in decline throughout the eastern US due to attacks by a parasitic fly (Compsilura concinnata), which was introduced to control gypsy moth.
Datanas are notoriously hard to ID as caterpillars, since many species look the same. I had to wait for the final instar to confirm it as the yellow-necked caterpillar (second picture). Two generations in the Northeast, adults in June, caterpillars late June onward into September, and caterpillars overwintering as pupae.
Anthony Fineran (B 1981), Datana Kirat, 2023
