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Roses can be spoiled by heavy infestations of sap sucking aphids (greenfly, blackfly and related insects) during spring and summer.
Aphids, also known as greenfly and blackfly, are sap-sucking insects. There are several species that occur on roses in Britain.
Check your roses regularly for signs of infestation;
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
Aphids usually overwinter on roses as eggs laid on the stems in the previous autumn. However, in sheltered places there may be active nymphs and adults all year round.
Aphid numbers start to increase in spring when roses are producing new growth and reach a peak in early summer. Some rose aphids are green but a common species, Macrosiphum rosae, is pink. During spring and summer, the aphids are mostly wingless forms, 2-4mm long, that give birth to live young.
Winged forms develop when plants are heavily infested and aphids need to migrate to new host plants.
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