Stop aphids killing your plants Aphids: Control with Ladybird Larvae Aphids suck the sap weakening plants, foliage may discolour & drop. Aphids produce a sticky deposit honeydew which later goes black on plants, they also transmit plant viruses. Control with Ladybird Larvae (Adalia Bipunctata): Adalia Bipunctata is a native British Ladybird. Voracious predators which feed on aphids & also on other small insects. Having trouble with garden pests? These biological control products will ensure that pests stop killing your plants.