The concentrated formula works within just 24 hours to rapidly kill common garden pests including greenfly, blackfly and aphids. Our aim is to always encourage a responsible approach to gardening and pest control and we will continue tooffer advice on alternatives to insecticides where they are likely to be helpful.

The convenience of rose clear is that this signal chemical will control all of the above problems and more. Unfortunately, this means that the resistance bred into new cultivars usually fails to last because new strains of the fungus arise to overcome it. is a combined insecticide and fungicide that will control black spot and rust on roses and other ornamental plants. 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. Each has its own advantages but for those who don’t want to spend time reading instructions and diluting down in water, the RTU ready to use rose clear is most effective.

The fungus spends the winter on fallen leaves and also in dormant infections on young stems and buds, producing spores in the spring to infect young foliage. Gardeners may gain a few years' respite by planting the newest cultivars which claim resistance, but as discussed above, this usually does not last.

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. Aphid numbers start to increase in spring when roses are producing new growth and reach a peak in early summer. Brand name(s) Rose Clear 2 (Rose Clear 2 has been replaced by a new product Roseclear Ultra with an increased range of uses and different active ingredients). The fungus produces spores in the black spot lesions on the upper leaf surface and these spread in water to initiate new infections. Check roses frequently from spring onwards so action can be taken before a damaging population has developed.The RHS is extremely concerned about the potential unintended effects of pesticides on bees, other pollinators and the wider environment. Robert Dyas Holdings Limited T/A Robert Dyas is an appointed representative of Product Partnerships Limited which is authorised and regulated by the Financial Conduct Authority (FRN 626349).