The introduction of ladybirds, hoverfly larvae, lacewing larvae and several parasitic wasps in a garden situation will reduce numbers.
You can attract the latter to your garden by installing insect habitats, such as wildflower stips and log piles.
Companion planting with strong-smelling herbs such as Basil, Chive, Allium and mint are believed to deter aphid activity. Nasturtium is a brilliant buffer plant which can attract insects away from vegetables and fruits.
Aphids aggregate in areas of new growth, so be sure to check in all the nooks of plants, especially under leaves!
For heavier infestations, treat plants with a strong jet of water to dislodge the insects from the plant.
Alternatively, use a light, soapy mixture sprayed on the plant or even just squashing them.
Indoor plants can be rinsed under a tap or shower.
A mixture of tomato leaf and distilled water is believed to repel aphids. Once the leaves are drained, dilute the remaining mix with 1-2 cups of water. Tomato plants contain the same allergens as nightshade. It's not advised to use this method if allergic to nightshade.
Garlic or chilli-based sprays diluted with water can act as a natural insect repellent.
Placing ant traps near infested plants will help to control secondary ant infestations.
Managed areas of herbaceous plants provide the perfect cover for predatory insects.
Sowing broad beans in autumn and overwintering seedlings/plants will ensure that the beans miss the migration of the black bean aphid from the over-winter host plant.
Pinching out the tops of broad beans when they have reached the desired height will help prevent an attack.