Hyles euphorbiae courtesy of Tony Pittaway.

This site has been created by Bill Oehlke at oehlkew@islandtelecom.com
Comments, suggestions and/or additional information are welcomed by Bill.

TAXONOMY: Family: Sphingidae, Latreille, 1802 Subfamily: Macroglossinae, Harris, 1839 Tribe: Macroglossini, Harris, 1839 Genus: Hyles Hubner, [1819] ........... Species: euphorbiae (Linnaeus, 1758)

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DISTRIBUTION:

The leafy spurge hawk moth, Hyles euphorbiae (length: 2-3 cm, wingspan: 5-7 cm), was the first classical biological agent released against leafy spurge in the United States, with approval for introduction granted in 1965. Populations of this insect are present in several western states, including Montana, Idaho, North Dakota, Minnesota and Oregon. The moth was also introduced from Europe into Ontario, Canada, and then into Alberta where specimens are occasionally still taken. I recently received an image of larva (July 2003) from Neepawa, Manitoba.

On July 25, 2006, I received this email note from Tom Middagh: "Thought you might be interested. Just got back from a little bug hunting in Vermillion (Clay County), southeastern South Dakota, July 21 and 22, right on the Missouri River. We set up a light for a couple nights. I was surprised to see five Hyles euphorbiae come in and sit on the sheet. I thought they were gallium but different. When I got home, I had a chance to take a closer look at the specimens and IDed them as H. euphorbiae."

Hyles euphorbiae, courtesy of Tom Middagh.

In late July-early August of 2007, I received images of larvae from Saskatchewan and southwestern Iowa.

Bonnie Hickey (Cashman Nursery), writes, August 2, 2007, "I have enjoyed watching these caterpillars on my Euphorbia mysinites in my yard in Bozeman (Gallatin County), Montana, for the past several summers. They do not feed on the Euphorbia polychroma or griffithii, however. I was planning to remove some of the Euphorbias but have decided to control seedlings with Preen instead so that I can continue to watch all the color stages of these caterpillars in future years!"

The body is light brown with various white and dark brown markings, while the wings have a conspicuous tan, brown, and pink or red color pattern. The upperside of the hindwing is a rosy-pink. There is a great deal of variation among the adults.

Originally this species occurs from south and central Europe to central Asia. It was released in Ontario on cypress spurge in 1965 with stock collected in eastern Germany and was subsequently redistributed within North America after screening by Agriculture Canada.

In mid July, 2003, I received images of Hyles euphorbiae larvae from Bismarck, North Dakota, and Innis Point, Ontario, just west of Ottawa.

FLIGHT TIMES:

These day-flying moths often exhibit a hummingbird-like flight while visiting flowers in leafy spurge-infested grasslands beginning in early to mid-summer. There are either one (Ontario) or two broods annually in the U.S.

ECLOSION:

Pupae probably wiggle to surface from subterranean chambers just prior to eclosion.

SCENTING AND MATING:

Females call in the males with a pheromone released from a gland at the tip of the abdomen.

EGGS, LARVAE AND PUPAE:

After mating, females lay small clusters of eggs, up to 50, on leafy spurge foliage. After hatching, larvae consume leafy spurge leaves and flowers.

H. euphorbiae larvae are found feeding on leafy spurge leaves. The caterpillars are also conspicuously colored, with a pronounced tail or "horn" near the rear end.

Young larvae are variously patterned with green, yellow, and black; older larvae have a distinctive red, black, yellow, and white color pattern. Mature larvae may approach 10 cm in length; when disturbed, they regurgitate a slimy green liquid. Image courtesy of Tony Pittaway.

The host range of H. euphorbiae appears restricted to plants in the subgenus Esula of the genus Euphorbia. In Europe, this insect feeds on leafy spurge and several other closely-related spurge species. There are a few native Euphorbia spp. in the U.S. that could potentially be hosts for H. euphorbiae, though no feeding has yet been documented under field conditions. H. euphorbiae will not feed on poinsettia (Euphorbia pulcherrima), and crop species and native plants outside the genus Euphorbia will not be attacked.

Pupae are 3.5-5 cm long and dark brown, and are found just below the soil surface where it tolerates -21°C. Pupae are prone to predation by mice.

H. euphorbiae larvae defoliate leafy spurge plants, but this damage seems to have little or no impact on spurge populations. In addition, hawk moth populations generally remain low in an area, due to predation and disease. Thus, H. euphorbiae plays only a very minor role in leafy spurge biological control.

Hyles euphorbiae, Innis Point, Ontario, July 20, 2003, courtesy of Bill Petrie.

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