Peach powdery mildew (Sphaerotheca pannosa var. persicae) – identify and control
Peach powdery mildew, Sphaerotheca pannosa var. Persicae fc oidium leucoconium is a widespread disease in many countries causing damage in the years with cold and wet springs, followed by dry, hot summers.
Symptoms. The attack first appears on the young leaves at the top of the shoots, in the form of white, powdery spots, which can enlarge and occupy the entire surface. The affected leaves look dusty, deformed, wrinkle, and eventually dry out. The attack on the well-developed leaves appears in the form of contoured spots. Next to them, a denser and dustier-looking growth is formed, due to the formation of spores.
The non-lignified shoots can be covered with powdery dust. The strong ones bend, wither and then dry out. The attack on the young or mature leaves is similar to that which appears on the developed leaves. Near the whitish spots, the tissues of the fruit turn brown, crack and begin to rot.
The pathogen is Sphaerotheca pannosa var. persicae fc oidium leucoconium. Its overwintering is done by resistance mycelium located in buds or by cleistothecia that form in autumn in the ectoparasitic mycelium. In the spring, the resistant mycelium enters the vegetation and infects the peach shoots.
Prevention and control. Prevention of the peach powdery mildew can be achieved by pruning and burning the attacked shoots. During the growing season, after the appearance of the disease, treatments will be made with specific fungicides.
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