Control of downy mildew disease on cucumber caused by the fungus psuedoperonospora cubensis by using environmentally friendly materials

الملخص EN

This study aimed to evaluate the efficacy of different agents in controlling downy mildew disease on Cucumis sativus L caused by Pseudoperonaspora cubensis using environmentally friendly treatments.

The experiment was conducted in the field in Balad District / Salah al-Din province during the spring season 2020 under greenhouse conditions.

The treatments included chemical agents with physical effect (casio3, k2sio3), plant extracts (garlic and neem) and biological control agents (T.

harzianum and P.

fluorescence) in a way.

Solitary and successive in controlling the epidemiological infection of Downy mildew.

The effect of treatments on the incidence and severity of disease and growth and production parameters of cucumber crop under greenhouse conditions compared to the fungicide Consento was evaluated.

The results showed that the single and successive treatments with silicates prevented the disease completely, with an infection rate of 0.00%.

This was followed by the highest reduction in the incidence and severity of infection in the garlic extract and fungicide treatments, which did not differ between them, followed by the treatment of garlic extract with a significant difference and the treatment of biological bacteria at a rate of 10.81% for each, then the treatment of successive spraying with biological control agents, which did not differ from the rate of infection rate in the treatment of the biological fungus T.

harzianum compared with the highest rate of infection in the untreated infected control treatment (72.95%), which differed significantly from All treatments.

The highest reduction in the severity of infection was recorded in the treatment of the fungicide Consento, which reduced the severity of infection to 1%, followed by the treatment of neem with a significant difference and severity of infection 12.47% and then significantly different from all other treatments under study.

In general, all treatments significantly reduced the severity of the infection from what it is in the control treatment (71.12%).

In the pesticide treatment (1637.6 g) (843.3) g.