![]() On edible plants make sure the food plant is listed on the label and follow instructions on maximum number of applications, spray interval and harvest interval. Bug Clear Ultra) is also availableįollow label instructions when using pesticides. The systemic neonicotinoid insecticide acetamiprid (e.g.A systemic containing the active ingredient Flupyradifurone (Provanto Smart Bug Killer) is available for use on ornamentals and selected edibles.Py Bug Killer). Permethrin is available as a smoke formulation for use in glasshouses (e.g. Provanto Ultimate Fruit & Vegetable Bug Killer, Provanto Sprayday Greenfly Killer) and cypermethrin (e.g. Westland Resolva Bug Killer), deltamethrin (e.g. More persistent contact-action insecticides include the synthetic pyrethroids lambda-cyhalothrin (e.g.These products contain some synthetic ingredients and so are not considered organic Ecofective Bug Control, Growing Success Bug Stop, Rose Clear 3 in 1 Action SB Plant Invigorator and Westland Resolva Natural Power Bug & Mildew). Plant invigorators combine nutrients to stimulate plant growth with surfactants or fatty acids that have a physical mode of action against aphids (e.g.Plant oil and fatty acid products are less likely to affect larger insects such as ladybird adults These pesticides have a very short persistence and so may require reapplication to keep aphid numbers in check. Vitax Plant Guard Pest & Disease Control, Bug Clear Fruit & Veg, Vitax Rose Guard) can give good control of aphids. Bug Clear Ultra 2, Neudorff Bug Free Bug and Larvae Killer) or plant oils (e.g. Organic sprays, such as natural pyrethrum (e.g.Products based on the synthetic pyrethroid permethrin are available as DeadFast Greenhouse Smoke Generator, DeadFast Greenhouse Smoke Fumigator. ![]() Glasshouse should be sealed and instructions on the product label must be followed. In glasshouses it is possible to use glasshouse fumigants.Plant oil winter washes are less likely to be detrimental to natural enemies and can mean that spring sprays are unnecessary This can be used when the buds are fully dormant in November-early February on a dry frost-free day. Overwintering aphid eggs can be destroyed by using a plant oil winter wash (organic e.g. Little can be done against aphids on tall trees as treatment is only likely to be successful if the entire plant is sprayed.If chemical controls are used, they should be used only in a minimal and highly targeted manner. 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.
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