Cucurbits powdery mildew (Sphaerotheca fuliginea) – identify and control
Cucurbits powdery mildew, Sphaerotheca fuliginea is a widespread disease in many countries and causes significant damage due to the fast drying of the leaves.
Symptoms. The disease manifests itself on the aerial organs (stems, leaves, fruits in all stages of development). On the surface of the attacked organs appears white, powdery spots, in the form of more or less extensive patches. On the surfaces of the leaves, the spots can join and cover large areas that soon dry out. Under this mycelium, the tissues turn yellow and brown. In conditions of atmospheric drought, the attack extends to the stems and even fruits. The optimal conditions for the installation and evolution of cucurbits powdery mildew are the temperature of 15-21 ° C and high humidity.
The pathogen is Sphaerotheca fuliginea. The fungus spreads during the growing season through spores carried by the wind, water, or insects. The most commonly infected are the mature leaves, while the newly formed ones are more resistant. The resistance fructifications have the appearance of small, black dots, are formed on the leaves and ensure the transmission of the pathogen until the following year.
Prevention and control. It is recommended crop rotation, gathering and destroying plant debris, cultivating resistant varieties. During the growing season, the application of specific fungicides is recommended.
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