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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 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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If only a few pots are affected, try sifting the grubs out by hand. Squash any you find before repotting the plants in fresh compost and putting the rest in the bin. What about barriers for vine weevil? Onion thrips ( Thrips tabaci) Causes a whitish mottling on the leaves of onion and leeks. It also feeds ona wide range of other plants, including carnation, chrysanthemum, begonia, cyclamen, dahlia, tomato and cucumber. It causes silvering of the foliage and on some plants, such as dahlia, feeding at the shoot tips results in severely stunted growth and distorted leaves.
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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. 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 A systemic containing the active ingredient Flupyradifurone (Provanto Smart Bug Killer)is available for use on ornamentals and selected edibles
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Follow 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. The life cycles of each aphid species differ in general for much of the year, aphid colonies consist of wingless females that give birth to live young. Winged forms develop when overcrowding,deterioration in the host plant or seasonal changes induce amove to another plant. Most aphid species overwinter as eggs but some can remain as active aphids, particularly in mild winters or on indoor plants. Tolerate some thrips damage, despite extensive silvery mottling established outdoor shrubs will usually survive the presence of glasshouse thrips 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.Encourage wildlife in the garden. Vine weevils and their grubs are eaten by a variety of predators such as birds, frogs, toads, shrews, hedgehogs and predatory ground and rovebeetles 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 The pesticides listed are legally available in the UK. This information is provided to avoid misuse of legal products and the use of unauthorised and untested products, which potentially has more serious consequences for the environment and wildlife than when products are used legally. 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. Yes, when Which? Gardening trialled controls we had most success with Scotts Bug Clear Ultra Vine Weevil Killer. It can only be used on pot-grown plants and can't be used on edible plants. What about biological controls for vine weevil?
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