Apply as a curative.
Most crops can be infested with aphids. Damage is caused in three ways: sucking plant sap when feeding, excretion of honeydew leading to sooty mould and some species can transmit plant viruses leading to distortion and disfigured plant growth. Biological control with parasites, predators and fungal pathogens are available depending on crop and environmental conditions. There are a large number of aphid species and identification can be important when parasitic wasps are to be used. Depending on the species there can be alternate plant hosts. Winged forms develop under conditions of high density to migrate to alternate hosts. Resistance to some insecticides is a serious issue with some species.
Activity / Control
Most types of aphid. Adults and larvae feed on most types of aphid
2-10 larvae per m2
A species of ladybird native to the UK. The adult beetle and larvae are both predatory.
Aphids are the preferred food for ladybirds, and both adults and larvae feed on most types.