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The caterpillar like larvae of large rose sawflies eat the leaves of wild and cultivated roses.
Large rose sawflies are insects with pale spotted black, green and yellow caterpillar-like larvae that eat the leaves of roses, sometimes causing severe defoliation. The adults have yellow abdomens with mainly black thorax and heads.
Roses can also be attacked by other sawflies such as the rose leaf-rolling sawfly and rose slug sawfly or slugworm.
You may see the following symptoms:
The larvae can be removed by hand. If eggs are present in the stem these can also be destroyed.
Organic pesticides, such as pyrethrum (e.g. Bug Clear Gun for Fruit and Veg, Defenders Bug Killer, Pyrol Bug & Larvae Killer) will control young larvae but larger larvae are more tolerant of these insecticides.
Heavy infestations can be sprayed with deltamethrin (e.g. Bayer Sprayday Greenfly Killer, Bayer Provado Ultimate Bug Killer), lambda-cyhalothrin (e.g. Westland Resolva Bug Killer), cypermethrin (e.g. Py Bug Killer) or the systemic insecticide acetamiprid (e.g. Bug Clear Ultra).
Plants in flower should not be sprayed due to the danger to pollinating insects.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
In Britain there are two species of large rose sawfly: Arge pagana and A. ochropus. The adult insects of both species have yellow abdomens with the legs, thorax and heads being mostly black. Arge pagana is the more common species.
Rows of eggs are inserted into soft young rose shoots and female sawflies are sometimes seen dangling from such stems, attached only by their saw-like egg-laying organs.
After hatching, the larvae feed together in family groups. They are pale green with black spots and yellow blotches, and are up to 25mm (about 1in) long. When fully fed, they go into the soil to pupate.
The large rose sawfly (Arge pagana) will produce two (sometimes three) generations from May to October. Arge ochropus usually has a single generation in early summer, but sometimes there is a second generation in late summer.
Berberis sawflyGooseberry sawflyRosesRose aphidsRose leaf-rolling sawflyRose slug sawfly or slugwormSolomon's seal sawfly
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davidw on 05/07/2014
is this the same problem as i hav on climbing and rambler roses when the bottem leaves drop off up to a metre thanks.david
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