Don’t bother attempting control of aphids on trees as they are considered part of thebiodiversity trees support and natural enemies will normally reduce numbers The adult beetles feed on the foliage of many herbaceous plants and shrubs, especially Rhododendron, evergreen Euonymus , Hydrangea , Epimedium, Bergenia, Primula and strawberry. Adults rarely cause enough damage to affect the vigour of plants.

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In glasshouses it is possible to use glasshouse fumigants. Glasshouse should be sealed and instructions on the product label must be followed. An organic fumigant based on garlic is available as Pelsis Pest-Stop Biofume Greenhouse Fumigator and can be used when crop plants are present. Products based on the synthetic pyrethroid permethrin are available asDeadFast Greenhouse Smoke Generator, DeadFast Greenhouse Smoke Fumigator Be aware that products such as Neem are not registered for use in the UK and we cannot advise they are used,Where you cannot tolerate aphids, manage them using the information above as your first course of action. A trap containing nematodes ( Steinernema carpocapsae), isavailable for controlling adult vine weevil. The traps should be placed on the ground below plants damaged by the weevils during the summer. The adults enter the trap during the day and are infected by the nematodes Biological controlfor the larvae is available as microscopic insect pathogenic nematodes. Several species and combinations are available ( Steinernema kraussei, Heterorhabditis megidis, H. bacteriophora and S. feltiae). They are availablefrom suppliers of biological controls and as sachet formulations available from some retail outlets. They are suitable for use in containers and in the open ground.For best results apply in August or early September when the soil temperature or potting mediais warm enough for the nematodes to be effective ( Steinernema species 5-20ºC/41-68ºF Heterorhabditus species 12-20ºC/ 54-68ºF) and before the vine weevil grubs have grown large enough to cause serious damage Vine weevil can feedon a wide range of plants, both indoors and outdoors, but can be especially damaging to plants grown in containers.It is a verywidespread andcommon insect. The adult weevils eat leavesduring spring and summer, but it is the grubs that can cause the most damage over autumn and winter when they feed on plant roots. This damage can resultin wilting andplant death.

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Further information about the use of pesticides available for management of aphids is available on the pesticides for gardeners leaflet. The RHS recommends that you don't use pesticides.Most pesticides (including organic types) reduce biodiversity, including natural enemies, impact soil health and have wider adverse environmental effects. There are a range of options. The most direct is to keep an eye open for the adults and destroy any that you find. As the adult weevils tend to feed during the night, it's worth going out with a torch. Winter wash is a plant oil application to the bark of fruit trees and shrubs targeting overwintering aphid eggs (organic e.g. Growing Success Winter Tree Wash). This may be used when the buds arefully dormant in November-early February on a dry frost-free day Plant invigorators combine nutrients to stimulate plant growth with surfactants or fatty acids that have a physical mode of action against thrips (e.g. Ecofective Bug Control, Growing Success Bug Stop, Rose Clear 3 in 1 Action SB Plant Invigorator and Westland Resolva Natural Power Bug & Mildew). These products contain some synthetic ingredients and so are not considered organicFollow label instructions when using pesticides. On edible plants make sure the food plant is listed on the label and follow instructions on maximum number applications, spray interval and harvest interval. Encourage natural enemies in gardens, for example the predatory bug Orius laevigatus can occur naturally Plant invigorators that combinenutrientsto stimulate plant growth with surfactants or fatty acids also have a physical mode of action against aphids (e.g. Spot-On Bug Control, Growing Success Bug Stop, SB Plant Invigorator and Doff Universal Bug Control). These products contain some synthetic ingredients and so are not considered organic Pea thrips ( Kakothrips pisivorus) Found on garden peas during June to August; causes stunted growth with a silvery brown discolouration on the foliage and pods; the latter may remain flat with just a few peas developing at the stalk end. Ornamental plants grown in containers can be treated with the systemic neonicotinoid insecticide acetamiprid (e.g. Bug Clear Ultra Vine Weevil Killer) as a liquid drench applied to the compost. This insecticide gives protection against the grubs for up four months; treatment in mid- to late summer will control the young larvae and prevent damage occurring later in the autumn to spring period. This product cannot be used to treat edible plants or ornamental plants growing in the ground

Vine weevil / RHS Gardening

Many aphids, especially those on fruits and vegetables, go through an annual cycle that involves two or more host plants. The plant on which overwintering eggs are laid is oftena tree or shrub. In the spring, the eggs hatch and the aphids feed on the young foliage. By early summer, the foliage has grown older and tougher, this combined with increasing temperatures and day-length induces winged forms of the aphid that migrate to the summer host plant. This is usually a non-woody plant with soft, succulent foliage. Some aphids, however, spend the whole year on one type of plant, although they may be active for only part of the year.

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Vine weevil is a very widespread insect in Britain. Gardeners with vine weevil should keep up their guard because stopping control measures after the apparent disappearance of the weevil can allow numbers to build up again. Always follow the instructions on the products. For 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. A systemic containing the active ingredient Flupyradifurone (Provanto Smart Bug Killer)is available for use on ornamentals and selected edibles