Baking soda makes it more difficult for black spot to infect plants. One is a solution made with baking soda: dissolve 1 teaspoon baking soda in a quart of water, add a few drops of liquid soap to the mix to help it cling better to the foliage, spray infected plants thoroughly. In the early spring when the leaf buds on the rose bushes first start to push out the little leaves, I spray all the rose bushes with a black spot treatment fungicide called Banner Maxx or a product called Honor Guard (a generic form of Banner Maxx). Reapply weekly and after any rain. Black spot (blackspot) is one of the most common diseases of rose bushes; and, if left unchecked, it can cause quite a bit of damage to your rose garden. To treat dark skin spots, you need to make wipes. a baking soda spray. But if a fungus like black spot takes over your rose bushes, it will eat away at the leaves and may eventually destroy your rose bush. Baking Soda Spray Recipe I control black spots on my roses with my home remedy, i.e. Baking soda and castor oil together can be used to treat over two dozen ailments and conditions. 1. Baking soda is a natural antifungal product that kills fungus immediately. “ During scientific trials, incomplete information was reported in a gardening publication that ultimately found its … Back in the 1980s, Dr. R. Kenneth Horst at Cornell University came up with a baking soda and horticultural oil recipe that helps manage black spot disease. Although you can buy a variety of commercial fungicides, these products are costly and are often harmful to the soil and surrounding plants. The first step is to deadhead your roses. Mix a 2 teaspoon of baking soda with a litre of water. In 1985, Dr. Horst, working at Cornell University, started testing the effectiveness of sodium bicarbonate on garden fungi, like powdery mildew and black spot on roses. Baking soda (sodium bicarbonate) is an antifungal agent and can even kill some established forms of fungus. The baking soda kills off fungal spores, while the oil helps the solution spread out to better cover rose foliage. The signs of black spot fungus on roses are hard to miss. Homemade Fungicide for Roses Baking Soda. My fungicidal spraying program for the last several years to prevent black spot in roses has been as follows:. How To Treat Black Spots On Roses Organically. These can suck up nutrients from the healthy parts of your plant. 2. Castor oil and Baking Soda Wipes for Dark Spots. preventive DIY fungicide is ready for your roses. Black spot is a common fungal plant disease that develops from leaf wetness, high humidity and plant overcrowding. Be sure to cut at a 45-degree angle. Add 2-3 drops of dish washing soap. Research has shown it's effective against some kinds of black spot and powdery mildew . Spray both side of the leaves. Thanks for the suggestion of milk/ water treatment for black spots. These leaves will be turning yellow and have huge black spots. Once the dead flowers are removed, snip off the black-spotted leaves and branches. Rose bushes add beauty and a fragrant scent to your garden. You will need: 2 teaspoons of baking soda; Castor oil; Cotton pads; Method: There are two ways that you can apply this mixture. Follow the simple steps to make fungicide with baking soda-Mix 5 grams of baking soda in 1-liter water and 1 teaspoon liquid soap.Boom! Best of all, baking soda is completely non-toxic for mammals, readily available in …