You must have the some kind of provincial agricultural agent. If you can, take a photo of the beasty and take that it along with a sample of the damage.

The only insect I know that does that is a cicada, but certainly bigger than a mosquito.

Eric

There is indeed a Wasp that lays eggs in the soft tissue of growing rose and Raspberry shoots. They are from the Sawfly group of insects. From the University of Guelph page, the italicized paragraph is particularly pertinent:

"Sawflies

Several species of sawflies occur on roses. Some sawflies cause damage by feeding only on leaves where others damage by boring and feeding within the stem. Adult sawflies are about 5-8 mm in length, they have four wings, and their abdomen is broadly joined to their thorax.

The larvae of the bristly rose slug sawfly skeletonize leaves from the underside and later eat holes through the leaf leaving only the large vein. The larvae feed mainly at night and are therefore not visible during the day. There are usually 2 generations per year. Most damage is apparent in late summer or early fall.

The common rose slug sawfly also skeletonizes leaves but does most damage in the spring. It usually feeds on the upper surface of leaves. It causes a considerable amount of injury to roses. Eggs are laid in the serrations at the edges of young leaves, usually one egg deposited within each leaf. There is only 1 generation per year.

The larvae of the curled rose sawfly eat the entire leaf surface. They then bore into the pith of pruned rose canes at the pruning cut. There are 2 generations per year.

The large rose sawfly is common in home gardens. Eggs are laid in a double row on shoots, each egg in a separate incision. The incision becomes blackened. The larvae may be found eating leaves from May to October. The larva is bluish-green with yellowish-black along the back, and six rows of black shining bristly tubercles. There are two generations per year.

For the above mentioned sawflies, hand picking of larvae may prove effective, if infestations are not severe.

The rose stem sawfly is wasp-like and appears in early summer. Eggs are laid in punctures made in the rose canes. Larvae bore through the canes causing shoots to stunt, wilt, or die back. To control this sawfly, canes must be pruned below the infested section."

Here is a link that might be useful: U of G Rose pest pages

Wasps will hunt them down. It's interesting to watch them first fly over a leaf, then drop down and fly under a leaf. They certainly have a lot more patience for it than I do.

Rose midge is mosquito like.

Here is a link that might be useful: Rose Midge

thank you everyone for your help. I'm sure that the sawfly is accurate so a special thanks trospero. Any suggestions about control. I do spray and it has been effective, haven't seen any larvae though, now I know what to look for. thanks again.

Unfortunately, chemical control isn't often 100% effective. If you find any shoots that are wilting at the tip and see evidence of eggs laid in the stem, cut these off and remove them from the garden. This will stop the next generation from hatching and moderate the population. Its rare that you will see heavy infestations of this Wasp, so most of us just remove and destroy damaged shoots when we find them and leave it at that.

Best wishes,
Paul