To prevent infections, a dormant spray of chlorothalonil, lime sulfur, or a copper based product such as Bordeaux mixture should be applied to trees in late fall after leaves have dropped, or early spring before the buds begin to swell. Bordeaux mixture (also called Bordo Mix) is a mixture of copper(II) sulphate (CuSO 4) and slaked lime (Ca() 2) used as a fungicide.It is used in vineyards, fruit-farms and gardens to prevent infestations of downy mildew, powdery mildew and other fungi. Opinions differ with regard to the method by which the fungus survives from season to season. Re: Advice Please on Peach Leaf Curl Disease and Treatment « Reply #6 on: April 29, 2010, 15:01 » Bordeaux mix is an anti-fungal thing made from copper sulphate. Peach leaf curl I have two small nectarine trees (grown from stones), one in a tub in my greenhouse and another planted against my south-facing, sheltered house wall. T. deformans is found in the United States, Europe, Asia, Africa, Australia, and New Zealand. Disease Cycle of Peach Leaf Curl: The incidence of the disease is associated with comparatively low temperatures such as occur in the spring. It is sprayed on plants as a preventive treatment; its mode of action is ineffective after a fungus has become established. Peach leaf curl is a plant disease characterized by distortion and coloration of leaves and is caused by the fungus Taphrina deformans, which infects peach, nectarine, and almond trees. Peach leaf curl reduces the amount of leaves and fruit produced by peach and nectarine trees. However, if copper sulfate is mixed with hydrated lime to make a Bordeaux mixture, the copper sulfate and calcium in the lime react together to form a fixed copper product that is effective against peach leaf curl. I gather it is now banned (due to the copper content). The nectarine variety‘Kreibich is also resistant to peach leaf curl. My fruit trees suffer from peach leaf curl and I usually spray them with Bordeaux Mixture. If you experienced problems with peach leaf curl this year, consider pruning the tree this fall prior to applying fungicides. Fortunately, peach leaf curl isn’t difficult to control. However, the timing of treatments is critical. The optimum temperature for the growth of the fungus is about 20°C. We use cookies to make the site easier to use.

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