I noticed that I had something that is perhaps similiar on mine. Leaf spots and blights result from a more localized infection. During an outbreak, all affected debris should be disposed of. These beetles can complete their life cycle right in your garden (they pupate in soil around plants), so keep a sharp eye out for these unwanted visitors. Fungal diseases often occur on rosemary plants when they are overwatered. Rosemary grows natively in Mediterranean regions, often in sandy or stony soils on hill sides. Moisture around the roots due to slow draining soils are the optimal conditions for the fungal pathogens to thrive which causes rosemary to turn black. There is one strand of webbing visible, which would mean spider mites, but could also be a coincidence. It had only flowered once before four years ago. Plants rapidly wilting and dying, often without turning yellow; as plants dry out they may turn straw yellow in color; small black fungal bodies (sclerotia) may be present on the surface of the root just below the soil line together with white fluffy mycelium; water soaked lesions may be present on the stem in Spring; infected tissues dry out and may become covered in white mycelium Generally, if white spots are results of fungal disease or insect infestations, use Neem Oil Fungicide and Insecticide and spray plant leaves once early in the morning every 7 to 10 days. Move the rosemary to a place where it will receive eight to 10 hours of indirect sunlight daily, or move it outdoors. The effects are black spots on the leaves, yellow discoloration, some holes, and eventually death of the leaf. When digging a hole for your rosemary or preparing pots and containers, add approximately 20% sand or grit to the area and 80% multi purpose compost. Gardenias have glossy, dark evergreen leaves which make a beautiful backdrop to their flowers. Planting rosemary too close together, surrounded by other plants or in an area with little airflow (in the corner of a patio for example) then a micro climate can occur which increases the relative humidity of the area. On the underside of the leaves, little black spots. The oil or soap makes the solution stick and the cost is around four cents a gallon. By the time temperatures reach into the seventies, the disease is running rampant and wont slow down until the daytime temperatures rise above 85 F. (29 C.). Mites feed by sucking plant juices, removing chlorophyll and injecting toxins which cause small white dots on the leaves, discoloring and distorting them. Also, you can spray Rose leaves with a solution of baking soda, neem or horticultural oil and dish soap. Fungus will continue to spread unless you remove it from the plant by treating it with a pesticide. Read the label directions for the method you choose and follow it closely. The aroma and flavour of rosemary is at its strongest in the years with infrequent rainfall, blazing sun and growing soils that are relatively poor in nutrients. Sphaerotheca fuliginea) being the most commonly reported cause. Wipe the blades with … It can attack any plant with fleshy leaves and stems if the conditions are right. Foliage of mite infested plants becomes stippled, yellow, and dry, and sometimes fine webbing is … Some diseases, such as black spot, can also turn rose leaves yellow. They are tiny, smaller than grains of sand and don't move. Black spot is the most serious disease of roses. The climate of the Mediterranean region is characterised by lots of sunshine, dry, arid conditions with infrequent rainfall. Common Disease Problems. The effects are black spots on the leaves, yellow discoloration, some holes, and eventually death of the leaf. 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