dogwood sawfly

(Macremphytus tarsatus)

Conservation Status
dogwood sawfly
  IUCN Red List

not listed

     
  NatureServe

not listed

     
  Minnesota

not listed

     
           
           
           
 
Description
 
 

Dogwood sawfly is a large sawfly. It occurs on the United States and southern Canada from the east coast to the Great Plains. It is most common in the northeast, uncommon in the southeast.

Adults are wasp-like in appearance but the abdomen is broadly joined to the thorax and they do not sting. Females are 716 to ½ (10.8 to 11.8 mm) in length. Males are a little smaller, 716 to ½ (10.8 to 11.8 mm) in length.

The head and body are black. The second section of the thorax is pitted and does not have conspicuous white spots.

The antennae are bicolored and have 9 segments. The first 5 segments (nearest the head) are black. The remaining segments are bright white. The second segment is very short, as wide or wider than long.

The legs are bicolored. The femur and tibia of the two hind legs are black. The femur and tibia of the four other legs may be black or whitish. The tarsi of all legs are white.

The newly hatched larva is translucent yellow. After molting a second time it is covered with a powdery, white, waxy coating that looks like bird droppings. After the final molting they are about 1 long, have a shiny black head, are yellow below, and are white with a single row of black spots above. The black spots are broad and have a white center.

 
     
 

Size

 
 

Male: to 716 (9.7 to 10.5 mm)

Female: 716 to ½ (10.8 to 11.8 mm)

 
     
 

Similar Species

 
 

Dogwood sawfly (Macremphytus testaceus) is mostly reddish-brown.

 
     
 
Habitat
 
 

Deciduous and mixed forests, yards with ornamental dogwoods.

 
     
 
Biology
 
 

Season

 
 

Late May to July. One generation.

 
     
 

Behavior

 
 

 

 
     
 

Life Cycle

 
 

Females lay up to 100 or more eggs on the underside of a single dogwood leaf. The eggs hatch in July and feed on the leaf, skeletonizing it. The final instar larva seeks rotted wood, or house siding, to make a cocoon, in which it overwinters. Adults emerge in late May to July.

 
     
 

Larva Food

 
 

Dogwood leaves

 
     
 

Adult Food

 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

7, 29, 30, 82.

 
  9/4/2021      
         
 

Occurrence

 
 

 

 
         
 
Taxonomy
 
 

Order

Hymenoptera (ants, bees, wasps, and sawflies)  
 

Suborder

Symphyta (sawflies, horntails, and wood wasps)  
 

Superfamily

Tenthredinoidea (typical sawflies)

 
 

Family

Tenthredinidae (common sawflies)

 
 

Subfamily

Allantinae

 
  Tribe Allantini  
 

Genus

Macremphytus (dogwood sawflies)  
       
 

Synonyms

 
 

 

 
       
 

Common Names

 
 

This species has no common name. The common name for the genus Macremphytus is dogwood sawflies, and is used here for convenience.

 
       

 

 

 

 

 

Glossary

Femur

In insects, the largest, most robust segment of the leg, coming immediately before the tibia. In humans, the thigh bone.

 

Tarsus

The last five sections of an insect’s leg, attached to the tibia; the foot.

 

Tibia

The fourth segment of an insect leg, after the femur and before the tarsus (foot).

 
 
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Laura O’Halloran (with Cian and Grady)

 
 

This is an ornamental Dogwood. And should we be doing something? It's the only dogwood on the property. Thanks!

 
    dogwood sawfly (Macremphytus testaceus)      
           
 
MinnesotaSeasons.com Photos
 
    dogwood sawfly      
           

 

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Other Videos
 
  Dogwood Sawfly Larvae
Carol Snow Milne
 
   
 
About

Published on Mar 28, 2013

8-7-12 Towamensing Twp. PA Open woodlands. Infestation. More than 20 larva eating leaves of a small tree near a brook. Causes damage to a variety of dogwood trees. Most likely a type of Swamp Dogwood Shrub.

 
       

 

Camcorder

 
 
Visitor Sightings
 
           
 

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  Laura O'Halloran
(with Cian and
Grady)

9/2/2019

Location: Lindstrom, MN

This is an ornamental Dogwood. And should we be doing something? It's the only dogwood on the property. Thanks!

dogwood sawfly (Macremphytus testaceus)  
  John Valo
9/4/2019

The Ohio State University has recommendations for managing dogwood sawflies. Here is the link:
Be Alert for Dogwood Sawfly

 
           
 
MinnesotaSeasons.com Sightings
 
 

Frontenac State Park

Lakeville, MN

 

 

 

Binoculars


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