Cowpea aphid has been detected on almost every lucerne paddock in the Monaro area in south-eastern New South Wales according to Local Land Services.

The aphids are thriving on current seasonal conditions and can cause severe animal welfare problems for sheep.

Sheep grazing on the lucerne infested with the aphids can result in severe photosensitisation which can present like 'sunburn' and cause scarring to vulnerable animals.

In adult sheep, it can lead to permanent eye damage and blindness and lambs it may lead to poor growth, secondary infections or even permanent disfigurement.