This aphid mainly overwinters as eggs on roses, but in mild winters, some adults may survive until spring.
The eggs hatch in spring into wingless females which reproduce parthogenetically, and large colonies can quickly develop, being mainly found on the tips of shoots and around flower buds.
The heaviest population densities are in June and July in the northern hemisphere, just when the bushes are flowering, and thereafter the populations decline.
This is because at this time of year, some winged females develop, which migrate to other rose bushes or to certain secondary hosts such as holly, teasel, valerian, Knautia and scabious.
With the onset of autumn, winged males are also produced, the insects return to roses and the eggs are laid.
This aphid mainly overwinters as eggs on roses, but in mild winters, some adults may survive until spring. The eggs hatch in spring into wingless females which reproduce parthogenetically, and large colonies can quickly develop, being mainly found on the tips of shoots and around flower buds. The heaviest population densities are in June and July in the northern hemisphere, just when the bushes are flowering, and thereafter the populations decline. This is because at this time of year, some winged females develop, which migrate to other rose bushes or to certain secondary hosts such as holly, teasel, valerian, Knautia and scabious. With the onset of autumn, winged males are also produced, the insects return to roses and the eggs are laid.
Macrosiphum rosae