General Discussion:

Hole-punched rose leaves


Messages posted to thread:

From:Date:Zone:
Carolyn05-Aug-00 08:10 PM EST   
H.H.Gardener05-Aug-00 10:45 PM EST   
Chas06-Aug-00 03:37 PM EST   
Chas06-Aug-00 03:47 PM EST   
Carolyn07-Aug-00 03:44 PM EST   
Claire-Ontario07-Aug-00 11:48 PM EST   
Carolyn09-Aug-00 10:36 AM EST   
Melanie09-Aug-00 10:50 PM EST   
Kay12-Aug-00 07:16 AM EST   
Helen17-Aug-00 02:30 AM EST   


Subject: Hole-punched rose leaves
From: Carolyn
Zone:
Date: 05-Aug-00 08:10 PM EST

My John Cabot climbing rose has really strange looking leaves. Each leaf has several large, almost perfectly round or should I say, half-spherical holes in them. Looks like someone took a large hole-punch to them. Is this slug damage? The slug holes on my Hostas look nothing like this so I'm concerned it may be something like a caterpillar. The plantings around it--Sweet-peas, Azaleas and Hydrangea are untouched. Do you know what this might be?


Subject: RE: Hole-punched rose leaves
From: H.H.Gardener
Zone:
Date: 05-Aug-00 10:45 PM EST

I am not sure what would cause these symmetrical holes. Caterpillars do damage like the slugs, it is irregular shaped, with no particular pattern. Is there yellow halos surrounding the holes? If so, it could be a fungal infection. Thrips do damage while the foliage is still unopened, but it too is not symmetrical in shape. They have rasping mouth parts and eat parts of the foliage leaving holes, but it would have brown surrounding the holes. If you have more to add, please enlighten us. Good luck.


Subject: RE: Hole-punched rose leaves
From: Chas
Zone:
Date: 06-Aug-00 03:37 PM EST

Those are leaf cutter bee's. They are kept around a crop that require a certain kind of bee that can pollinate the plant. They actually clip off a part of the plant that can flick the bee when it tries to take the nectar. For the life of me I can't remember the name of the crop...alfalfa maybe?


Subject: RE: Hole-punched rose leaves
From: Chas
Zone:
Date: 06-Aug-00 03:47 PM EST

Just thought of more...I am from southern Manitoba,Canada. They grow those leaf cutter bees around here. You will know you have them because they actually mark the hives with different stripes so that the bees can find their way home to their hives (yes that is true!). if you have any of these hives close to your home your roses will have those perfect circles. They don't kill the roses...they are just confused bees because they can't tell their crop that they were breed from apart from other plants!


Subject: RE: Hole-punched rose leaves
From: Carolyn
Zone:
Date: 07-Aug-00 03:44 PM EST

Leaf-cutter bees? EEK!

I live in the fruit belt of Niagara so I guess this is possible since there is farmland everywhere.

These leaf holes are perfectly symetrical with no halos or any signs of disease. I can't see any of this kind of damage on my other roses so I'm a little confused why they're attacking this rose in particular but if you say, Chas, that these bees are just confused then I guess, I have an explanation, somewhat. I've looked around for hives but have found none. Later today, I'll go out and hang around the climber and see if I can see these bees up close and personal.

Will they hang around all summer or will they move off somewhere else? Thanks for the info.!


Subject: RE: Hole-punched rose leaves
From: Claire-Ontario
Zone:
Date: 07-Aug-00 11:48 PM EST

Hi Carolyn...I think these bees have a preference for Explorer Roses.....

That seems to be the only one they've taken to in my garden....I found out about them a year or two ago.

It's amazing just how perfectly round the holes are eh....a real mystery to me too. The plus side is they don't seem to harm the plant at all.


Subject: RE: Hole-punched rose leaves
From: Carolyn
Zone:
Date: 09-Aug-00 10:36 AM EST

Hi Claire! Thanks for the reply.

My friend returned one of my rose gardening books today and I was able to find an explanation for the laef holes. They are indeed leaf cutter bees as you and Chas suggested. Apparently, they use the little leaf bits to construct their hive. Weird.

I'm really relieved they don't harm the rose at all. It just looks pretty funny.

A few of my elderly neighbors came by and diagnosed the problem as cutworms, black spot(HUH?!) and possibly slugs. They didn't believe the leaf cutter bee story. I think b/c I'm young; they think I couldn't possibly know anything about gardening let alone bees--even though I've been gardening for 10yrs. Oh well...at least they're helpful.

Thanks all!


Subject: RE: Hole-punched rose leaves
From: Melanie
Zone:
Date: 09-Aug-00 10:50 PM EST

Hi Carolyn, Just wanted to put in my 2 cents too. I have the same holes on my Maltese Crosses...they seem to like those too! So glad I read your Q & A's as they diagnosed what I was looking for....Happy Gardening :)


Subject: RE: Hole-punched rose leaves
From: Kay
Zone:
Date: 12-Aug-00 07:16 AM EST

Hi - regarding the leaf cutter bees. If you find one, it will be a small black and white striped bee, and I don't think they sting. In a rotten log one time I found what they do with the cut out part of the rose leaves. They make the most beautiful little curled up nest for their eggs, and it looked like they filled it with pollen for their babies after they hatch. The little cylinders of leaf were so marvellously constructed. I don't know much about the commercial production of leaf cutter bees. I think the leaf cutter bees were using tunnels that other insects made in the log.


Subject: RE: Hole-punched rose leaves
From: Helen
Zone:
Date: 17-Aug-00 02:30 AM EST

Carolyn: Just another thought. I too have those little holes on two of my roses--one a hybrid tea and one a David Austin. Both roses are among other roses but in different parts of the garden. On both of these bushes I found tiny little green bugs that looked like caterpillars. I just pick them off. I don't know if that's what making the holes, or the bees, but it's funny that only these two plants have the holes and they're the only ones I found the little caterpillars on.


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