JUNIPER-TWIG GEOMETER

JUNIPER-TWIG GEOMETER

Patalena olyzonaria
GEOMETER MOTH FAMILY (Geometridae)

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The Juniper-twig Geometer moth has a wingspan of approximately 1.25 inches. It is variably orangish, pinkish or reddish-brown. The forewing is hooked at the tip, the hook being more pronounced on the female. The bold, black post-medial line kinks inward before it reaches the costa. It often has black blotches in the subterminal area. In the hindwing the outer margin is rounded and the post-median line is straight. The caterpillar is a slender, elongate twig mimic and perfectly matches the host, cedar foliage, in color and pattern. It is brown or gray with dark angular lines dorsally and laterally creating a diamond shaped pattern. There is a pair of black dorsal warts on the 9th abdominal segment The head is brown and gray with a dark brown herringbone pattern on the lobes.

 

The frequency of occurrence of this moth in our area is not known. It has been seen at Fontenelle Forest Nature Center in late October 2016. They range from Quebec and New Hampshire to Florida, west to Texas, north to Wisconsin. Adults fly from April to October.

 

The caterpillars primarily eat the leaves of Juniper and, occasionally, Northern White Cedar. The species overwinters in the pupal stage.

 

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