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infestations, scrape off the scales by hand and dispose of them. For heavy infestations, prune out those branches that are badly affected. Spray with a plant oil wash in winter.Spray the young scales in mid-July and early September with a systemic insecticide

on the leaves.Dispose of fallen leaves that might have the bugs or eggs attached. Use the predatory ladybird Cryptolaemus montrouzieri when temperatures rise in summer. Also try spraying plants with fatty acids or plant oils. You may need to do this a few times

be used on houseplants and in greenhouses to attack the western flower thrips. Organic pesticide sprays are available, which are based on plant oils or pyrethrum.Ornamental plants can be sprayed with insecticides containing imidacloprid with methiocarb

These tiny, sap-sucking pests may be only 0.5mm long but they can wreak havoc in a greenhouse or on houseplants indoors. For most of the year they are a pale green colour with two dark spots on their back; it's only in autumn and winter