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Contact insecticides are not normally effective,
for the do not easily penetrate the damage rose leaves. Systemic
insecticide such as Provado Ultimate Bug Killer will normally work, but
it will have to be applied at an early stage to be really effective.
Perhaps Provado used as a part of a regular routing spraying of special
rose bushes may be the best form of defence.
The adult sawfly is similar to a wasp in appearance,
and similar to the group of hover wasps, hover flies that are beneficial
in the garden.
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