Pesticide control The RHS believes that avoiding pests, diseases and weeds by good practice in cultivation methods, cultivar selection, garden hygiene and encouraging or introducing natural enemies, should be the first line of control. More information about these can be found on the ‘ aphid predators’ page. Some natural enemies can be purchased for use as biological control of aphids in greenhouses, including hoverfly larvae, lacewing larvae and several parasitoid wasps.Indiscriminate use of pesticides can reduce the numbers of useful predators. Be aware that in spring aphid populations often build up before natural enemies are active in sufficient numbers and then give good control. Encourage the natural enemies of aphids in the garden, such as ladybirds, ground beetles, hoverflies, parasitoid wasps and earwigs.Use finger and thumb to squash aphid colonies where practical.Where possible tolerate populations of aphids.Pesticide treatments are likely to kill natural enemies and are only likely to be successful if the entire plant can be reached. Within pesticides the shorter persistence products (that are usually certified for organic growing) are likely to be less damaging to non-target wildlife than those with longer persistence and/or systemic action. When choosing control options you can minimise harm to non-target animals by starting with the methods in the non-pesticide control section and avoiding pesticides. On established trees aphids can usually be considered part of the biodiversity they support, natural enemies will normally reduce numbers by late summer. Check plants frequently so action can be taken before a damaging population has developed. Malvern Autumn Show - 22–24 September 2023Īphids form the basis of many food chains in the garden and it is not unusual to have some of these animals in a healthy balanced garden ecosystem.RHS Garden Wisley Flower Show - 5–10 September 2023.RHS Garden Rosemoor Flower Show - 18–20 August 2023.RHS Garden Hyde Hall Flower Show - 2–6 August 2023.RHS Flower Show Tatton Park - 19–23 July 2023.RHS Hampton Court Palace Garden Festival - 4–9 July 2023.
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