Found two yesterday, and just found another one on a different bush today.
The bug is quite big and conspicuous- about 5mm or so long. It has wings.
The head and upper body are black, the lower body is bright orange and soft;
if I squash one, it appears to be orange inside(!) like a sac of soft orange
stuff.

They appear to travel down the stem leaving a black stripe- either cutting a
stripe or laying eggs in a line inside(?), can't easily tell.

Any idea what they are, and if so, are they harmful? I've never seen one
before, but then I've never been a rose gardener before, kind of thing. Any
ID gratefully appreciated.


Ian

"Ian B" wrote...
Found two yesterday, and just found another one on a different bush today.
The bug is quite big and conspicuous- about 5mm or so long. It has wings.
The head and upper body are black, the lower body is bright orange and
soft; if I squash one, it appears to be orange inside(!) like a sac of
soft orange stuff.

They appear to travel down the stem leaving a black stripe- either cutting
a stripe or laying eggs in a line inside(?), can't easily tell.

Any idea what they are, and if so, are they harmful? I've never seen one
before, but then I've never been a rose gardener before, kind of thing.
Any ID gratefully appreciated.

Sounds like the Rose Slugworm or Rose Slug-sawfly. the lavae are
yellow-green and caterpillar shaped and will eat the top of the leaf. This
Sawfly does not roll the leaf or, usually, eat the underside of the leaf
unlike a lot of other Sawflys.
Confirm it by checking the photos on...
http://bluewisteria.co.uk/pest/pest_...e+sawfly+larve
--
Regards
Bob Hobden
W.of London. UK

Bob Hobden wrote:
"Ian B" wrote...
Found two yesterday, and just found another one on a different bush
today. The bug is quite big and conspicuous- about 5mm or so long.
It has wings. The head and upper body are black, the lower body is
bright orange and soft; if I squash one, it appears to be orange
inside(!) like a sac of soft orange stuff.

They appear to travel down the stem leaving a black stripe- either
cutting a stripe or laying eggs in a line inside(?), can't easily
tell. Any idea what they are, and if so, are they harmful? I've never
seen
one before, but then I've never been a rose gardener before, kind of
thing. Any ID gratefully appreciated.

Sounds like the Rose Slugworm or Rose Slug-sawfly. the lavae are
yellow-green and caterpillar shaped and will eat the top of the leaf.
This Sawfly does not roll the leaf or, usually, eat the underside of
the leaf unlike a lot of other Sawflys.
Confirm it by checking the photos on...
http://bluewisteria.co.uk/pest/pest_...e+sawfly+larve

Thanks Bob, that looks like the chappie!

Should I remove and destroy those areas that have been "striped" by the
sawflies? Are they lines of eggs?


Ian

"Ian B" wrote
Bob Hobden wrote:
"Ian B" wrote...
Found two yesterday, and just found another one on a different bush
today. The bug is quite big and conspicuous- about 5mm or so long.
It has wings. The head and upper body are black, the lower body is
bright orange and soft; if I squash one, it appears to be orange
inside(!) like a sac of soft orange stuff.

They appear to travel down the stem leaving a black stripe- either
cutting a stripe or laying eggs in a line inside(?), can't easily
tell. Any idea what they are, and if so, are they harmful? I've never
seen
one before, but then I've never been a rose gardener before, kind of
thing. Any ID gratefully appreciated.

Sounds like the Rose Slugworm or Rose Slug-sawfly. the lavae are
yellow-green and caterpillar shaped and will eat the top of the leaf.
This Sawfly does not roll the leaf or, usually, eat the underside of
the leaf unlike a lot of other Sawflys.
Confirm it by checking the photos on...
http://bluewisteria.co.uk/pest/pest_...e+sawfly+larve

Thanks Bob, that looks like the chappie!

Should I remove and destroy those areas that have been "striped" by the
sawflies? Are they lines of eggs?

I doubt you would get them all so I would use a spray idc when the larvae
first emerge and keep an eye on it.

--
Regards
Bob Hobden
W.of London. UK

Bob Hobden wrote:
"Ian B" wrote
Bob Hobden wrote:
"Ian B" wrote...
Found two yesterday, and just found another one on a different bush
today. The bug is quite big and conspicuous- about 5mm or so long.
It has wings. The head and upper body are black, the lower body is
bright orange and soft; if I squash one, it appears to be orange
inside(!) like a sac of soft orange stuff.

They appear to travel down the stem leaving a black stripe- either
cutting a stripe or laying eggs in a line inside(?), can't easily
tell. Any idea what they are, and if so, are they harmful? I've
never seen
one before, but then I've never been a rose gardener before, kind
of thing. Any ID gratefully appreciated.

Sounds like the Rose Slugworm or Rose Slug-sawfly. the lavae are
yellow-green and caterpillar shaped and will eat the top of the
leaf. This Sawfly does not roll the leaf or, usually, eat the
underside of the leaf unlike a lot of other Sawflys.
Confirm it by checking the photos on...
http://bluewisteria.co.uk/pest/pest_...e+sawfly+larve

Thanks Bob, that looks like the chappie!

Should I remove and destroy those areas that have been "striped" by
the sawflies? Are they lines of eggs?

I doubt you would get them all so I would use a spray idc when the
larvae first emerge and keep an eye on it.

Thanks Bob, any particular spray? What is "idc"?


Ian

"Ian B" wrote (huge snip)

Thanks Bob, any particular spray? What is "idc"?

Any insecticide should do and idc means "in due course". Sorry, old
dictation habits.

--
Regards
Bob Hobden
W.of London. UK