This pest can decimate the foliage of gooseberry and red and white currant bushes, sometimes reducing the bush to a skeleton. The adult emerges in mid spring and lays its eggs on the underside of leaves usually low down and in the centre of the bush where it is difficult to spot them. The eggs hatch out into larvae which look like small pale green caterpillars and which munch voraciously through the foliage, working their way upwards and outwards. Although the fruit is not affected, the plant is weakened and fruiting may be affected next year.There may be three generations a year. Check carefully for any eggs or larvae as described above and remove by hand.