Aphids often colonise the undersides of plant leaves where they are less visible to predators. In this photograph, you can see a number of lacewing larvae predating on an aphid colony gathered on the underside of a Lathyrus odoratus leaf.

Aphids often colonise the undersides of plant leaves where they are less visible to predators. In this photograph, you can see a number of lacewing larvae predating on an aphid colony gathered on the underside of a Lathyrus odoratus leaf.

Episyrphus balteatus, also known by its common name of marmalade hoverfly, laying eggs on a Sweet Pea tendril produced by one of the wigwam grown Sweet Pea plants, which were grown for my 2016 Sweet Pea Trial.

Episyrphus balteatus, also known by its common name of marmalade hoverfly, laying eggs on a Sweet Pea tendril produced by one of the wigwam grown Sweet Pea plants, which were grown for my 2016 Sweet Pea Trial.

A marmalade hoverfly, also known by its scientific name of Episyrphus balteatus, laying eggs on a Lathyrus odoratus 'Misty' flower bud, that is covered by a vast colony of aphids.

A marmalade hoverfly, also known by its scientific name of Episyrphus balteatus, laying eggs on a Lathyrus odoratus 'Misty' flower bud, that is covered by a vast colony of aphids.

A marmalade hoverfly, also known by its scientific name of Episyrphus balteatus, laying eggs on a Lathyrus odoratus flower stem.

A marmalade hoverfly, also known by its scientific name of Episyrphus balteatus, laying eggs on a Lathyrus odoratus flower stem.

A Ladybird larvae pictured on a Lathyrus odoratus leaf, during the 2016 Sweet Pea Trial.

A Ladybird larvae pictured on a Lathyrus odoratus leaf, during the 2016 Sweet Pea Trial.

Both adult ladybirds and their larvae predate on aphids, they are valuable allies for gardeners.  This ladybird larvae was pictured on Lathyrus odoratus during the 2016 Sweet Pea Trial.

Both adult ladybirds and their larvae predate on aphids, they are valuable allies for gardeners. This ladybird larvae was pictured on Lathyrus odoratus during the 2016 Sweet Pea Trial.

A Ladybird larvae residing on a cordon grown Lathyrus odoratus stem.  Pictured during my 2016 Sweet Pea Trial.

A Ladybird larvae residing on a cordon grown Lathyrus odoratus stem. Pictured during my 2016 Sweet Pea Trial.

A ladybird resting on a Lathyrus odoratus leaf that has a covering of powdery mildew.

A ladybird resting on a Lathyrus odoratus leaf that has a covering of powdery mildew.

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