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Question: hedge with red spots
Hi I have a hedge whose leaves have red spots, they told me to spray them with seed oil and baking soda, can it serve? What could be the problem ? Thank you very much, bye
Answer: hedge with red spots
the use of oils (generally minerals) in agriculture is practiced when insects are present on the plants, typically against the cochineal, which is covered with a waxy shield, not permeable by water, but which is instead dissolved by oily substances; this type of remedy is commonly called white oil, and often also alone (without the addition of pesticides) it is able to eradicate many insects; in your case the red spots do not seem to indicate the presence of insects, and therefore the use of white oil would be completely useless; generally it is preferred to use the mineral oil prepared for agriculture because it is specially treated to be used on plants, and it is also perfectly miscible in water. Bicarbonate has instead been used for some years as a preventive remedy against powdery mildew, because some studies say that this substance, dissolved in water, can somehow strengthen the cell walls of the cells that make up the foliage, which therefore tend not to come attacked by fungi, particularly those of oidium. In your case, the presence of red spots on the foliage, is usually a full-blown case of fungal attack, which now lurks already on the leaf page. Against these parasites it is necessary to act quickly, and I do not know how effective bicarbonate can be, if not to contain the spread of the disease. Generally when this type of parasites occur, the main problem is excessive humidity, which favors their development and propagation, for this reason, often when temperatures rise in spring, most fungal diseases that proliferate on the leaves fresh and moist, disappears from the plants. Unfortunately, spring 2013 is taking place as a decidedly cool and very humid season, with persistent and continuous rains, and this certainly does not help you to eradicate the disease, on the contrary, it favors life. For this reason it is important that you use a good systemic broad spectrum fungicide on your hedges that can kill the fungi; you can use a typical synthetic fungicide (for example based on propiconazole), or choose a fungicide suitable also in the organic garden, so as to avoid the spread of harmful chemicals in your garden; products suitable for organic cultivation are usually made up of fungi or bacteria that develop in competition with harmful fungi, which are then decimated. In your case, given that usually the fungal diseases that develop by producing red spots are quite difficult to eradicate, it is therefore good to try to fight the fungus on several fronts; first of all you can collect any fallen leaves and burn them, because they will surely contain the spores of the fungus; you can also prune the hedge a little, trying to give most of the diseased leaves.