dogwood sawfly

(Macremphytus tarsatus)

               
Conservation Status

IUCN Red List

not yet assessed

dogwood sawfly

NatureServe

not listed

Minnesota

not listed

Occurrence

 

Flight/Season

Late May to July. One generation.

Habitat

Deciduous and mixed forests, yards with ornamental dogwoods.

Size

Total Length: ¾

 

Identification

Larva
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.

Adult
This is a large sawfly, up to ¾ in length. It is wasp-like in appearance but the abdomen is broadly joined to the thorax and they do not sting.

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.

 
Similar
Species

Macremphytus testaceus has two white shoulder spots and a large, conspicuous white spot at the base of the second section of the thorax.


Larval Food

Dogwood (Counus) leaves

 
Adult Food

 

 
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.

 
Behavior

 


Distribution Distribution Map  

Sources: 7.


Comments

 


Taxonomy

Order:

Hymenoptera (ants, bees, wasps, and sawflies)

 

Suborder:

Symphyta (horntails, sawflies)

 

Superfamily:

Tenthredinoidea (sawflies)

 

Family:

Tenthredinidae (common sawflies)

 

Subfamily:

Allantinae

 

Tribe:

Allantini

 
Synonyms

 

 
Common
Names

dogwood sawfly


 

 

 

 

 

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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  dogwood sawfly    
       
       

 

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  Dogwood Sawfly (Macremphytus tarsatus)
Bill Keim
 
  Dogwood Sawfly (Macremphytus tarsatus)  

 

slideshow

     

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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

         

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MinnesotaSeasons.com Sightings

   

Frontenac State Park

Lakeville, MN


 

 

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