Insect damage on climbing rose

13 years ago

What insect chews through 90% of the cane a few inches below new growth so that the remaining stalk flops over? I have seen cicadas on the bush. Is it them?

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Comments (6)

karl_bapst_rosenut
13 years ago
Have you considered it might be a rabbit or other rodent?
hartwood
13 years ago
This does sound like rabbit damage. They're infuriating little boogers, because they topple canes like little lumberjacks, and then many times they don't have the decency to eat what they've lopped off.

Connie
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Soap doesn't affect the future insects. it kills the insects that are coated with soap spray. Just apply it to the heavily infested growth tips. I can't make out the image of the winged insect, but if it is nearly immobile and looks like a winged aphid, that's what it is. Many beneficial predators will be present when aphids are thick, including syrphid flies and larvae, lacewing adults and larvae, ladybugs and larvae, and tiny wasps. They will almost always gain control of the aphids within a few weeks. Wiping off the thickest concentrations of aphids is a suitable control measure. Spraying water is fine, although many of the aphids will climb back up the rose. Aphids don't do significant harm unless they encrust the stems continuously for over a week.
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Katydids will slice buds cleanly, usually vertically. The nymphs (immatures) look like spindly green grasshoppers. They are hard to see. If you try to catch one, anticipate a leap forward and up. However, they don't hollow out. There's a kind of sawfly larva that will hollow out buds, but I don't recall the sliced look. Also I have some large black ants that do this-- not sure whether they initiate the damage, but I think they do. These buds are sliced horizontally and then hollowed. You could apply to the closed buds only an insecticide that is labelled for chewing insects (beetles and worms).
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Desease or insect damage?
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Comments (1)
This sounds like sawfly damage aka rose slug, which isn't actually a slug or a caterpillar. The are tiny green wormy looking creatures are the larval form of the sawfly found on the underside of the leaf . You can either squish them or hose them off with a hard spray of water. Insecticides work, but why bother when water does as well. The key is to get them when you first notice the damage and keep at it until you don't find any more. If they are in pots, covering the soil with landscape fabric can keep them from pupating in the soil and returning for round two!
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michaelg
13 years ago
Is the stem girdled with a near, thin cut, or chewed coarsely. or is there a ragged vertical slit? Is this old or fresh damage? By "cane," do you mean an old woody stem? Picture would help.
stevega
Original Author
13 years ago
This is on the reddish new growth at the top of stems, not big canes. It is 4-5' off the ground so not rabbits. They eat about 1/2" long from one side so the remaining top growth flops over on the uneaten "hinge". There are no noticeable chew marks. There's not much new growth now, so I won't be able to send a picture, sorry. That is the only problem that I have had this year. I'll be on it in the spring if it reoccurs.
Thanks
michaelg
13 years ago
Not cicadas, then, but some kind of good-sized worm or beetle that you ought to be able to see unless they were feeding only at night.
york_rose
13 years ago
Every species in the insect order of which the cicadas are a part has a mouth that looks like and functions as a needle. None of those insects chew when they feed; rather they suck juices out of the plant host's interior.

No, if you have chewing damage it wasn't caused by a cicada.

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Insect damage on climbing rose

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Insect damage on climbing rose

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