Sulfur based treatments

Question: when to use sulfur

roses tend to get oidious in this heat can I give copper and sulfur? in the evening or in the morning? should the earth be dry or wet? thanks

Sulfur based treatments: Answer: fungicides in the garden

Dear Maria Teresa,
powdery mildew is a fungal disease that typically attacks roses, as well as many other garden and garden plants. In particular, this fungus tends to develop in fairly high temperatures, and in the presence of moisture on the foliage. In fact the mushrooms tend to develop in the patches of water that remain on the foliage after watering, especially if they occur in the evening. Usually oidium tends to begin to appear in late spring, and its presence in the garden is continuous and constant until the autumn. Certainly, as is the case with most fungal diseases, the best cure is prevention, which involves maintaining good ventilation between the plants and avoiding watering the roses even by wetting their hair. In addition to this, often a preventive treatment with sulfur, already done in February or March, manages to kill most of the spores, avoiding the spread of the disease. If the oidium is still present in summer, it is necessary to cure it using sulfur-based products; unfortunately this element is decidedly toxic for plants when the temperatures are very low, or very high (with average temperatures above 30 ° C), this condition occurs every year in Italy, when the lows can also be quite low, but daytime highs are above 30 ° C for long periods of time. Fortunately, the action of sulfur is rapid, and therefore it is essential to use it when the temperatures are cool, or in the early hours of the morning or during the evening hours, when the thermometer falls at least below 32 ° C. If the temperatures remain higher we can use cupric products, or other types of fungicides, which do not show problems due to high temperatures. In addition to spreading the fungicide on the foliage, let us remember to remove and destroy all the fallen leaves from our shrubs, which otherwise act as a safe haven for the spores that fall from the overlying shrub and therefore prevent us from eradicating the disease, which continues to develop periodically on the plant.