Rose Aphids (macrosiphon rosae) can be found on the roses in early spring but a spray of soapy liquid will control them instead of pesticides.
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Their natural enemies are ladybirds, hoverflies and some small birds.
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They are easily identified by their knees, antennae and very long horns on abdomen being black. In this photograph you can see ladybird larva too.
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They range from pale pink to reddish brown in color and are found in winged form.