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Rose Aphids



P_roseaphid

Rose Aphids

Usually appear in

Spring to Autumn.


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Caused By:-     The insect aphid Macrosiphum rosae

Description

Roses are attacked by two types of aphids namely Greenfly and Blackfly. These aphids suck the sap and therefore take the strength out of Roses if not checked as soon as possible. They also transmit other viruses and diseases to the roses.
They normally start feeding on the tender young shoots and buds and during their feeding they excrete honeydew which attracts ants. The ants farm the aphids and move them to other parts of the roses. The honeydew also causes black mouldy growth on the leaves.
The Rose Aphid Macrosiphum rosae is only one over 4000 species of aphids which vary in size, color, and even mating habits, but are, in general, divided into two groups, which are, those that only lay eggs, like the Pine Aphid, and those that bear live young like the Rose Aphid.
Often Aphids are specific to certain plants for example Rose Aphids mainly attack roses, but may attack closely related plants when roses are not available.
Aphids are usually wingless, but sometimes, usually, during the Autumn they produce winged male and females, which lays eggs that overwinter and hatch in the spring. They may also survive as young nymphs and adults ready to start the cycle again in the Spring. The variety of survival methods employed is very varied.
Picture by Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org.
See also these other aphids Aphids, Blackfly, Cypress, Green Spruce, Honeysuckle, Juniper, Lettuce Root, Lupins, Mealy Cabbage, Mealy Plum, Melon Cotton, Peach, Rosy Apple, Willow Bark Aphid, Wooly.


Control

As an emergency quick solution I squish them between the fingers or wash them off with a strong get of water, then later spray with a knock down or systemic insecticide.
Research has shown that aphids can quickly mutate to become pesticide-resistant. If using organophosphates or carbamates, rotate spraying between two or three different types.
Soap and detergent sprays can be effective, but remember that these simply wash off the greenfly, they often return and have another go! Insecticidal soaps is another useful spray.
Encourage beneficial insects like Ladybirds Lacewings, Hoverflies, Spiders and Parasitic Wasps. in the garden These predators eat the aphids and keep this pest to a minimum.
Winter tar wash or plant oil wash plants if possible as this will get rid of overwintering eggs.



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