Annotation

Significant losses of sugar beet harvest are caused by numerous diseases. It is pointed out that cercospora leaf spot is one of the most dangerous diseases limiting sugar beet yielding. An urgent problem of beet growing in Ukraine is the increase in the production of sugar beet roots.

In the integrated plant protection against disease, the chemical method is the most common and effective. The use of highly effective systemic fungicides in modern technologies is a factor that limits the development, spread and harmfulness of cercospora leaf spot, increases the effectiveness of protection treatments and significantly affects the yield of roots.

The conducted research allowed determining the effectiveness of selected fungicides (Rex Duo, Abacus, Amistar Extra) against Cercospora beticola Sacc.It is showed that under the action of fungicides development of the disease decreased as compared to the control. It was found that spraying sugar beet with fungicides reduced the damage to the leaf surface by Cercospora beticola from 1.8 to 0.2 points.

At the same time, a positive effect of fungicides on the yield of sugar beet was demonstrated. One-time application of Rex Duo (0.7 l/ha) increased the yield of sugar beet roots by 4.9 t/ha compared to the control (without fungicides).

The highest yield of sugar beets (53.0 t/ha) was obtained in condition of Rex duo (0.7 l/ha) + Abacus (1.5 l/ha) application.

Using Rex duo (0.7 l/ha) for the first treatment and spraying Amistar Extra (0.75 l/ha) for the second one provided also a high yield (52.6 t/ha).

Application of the Rex duo (0.7 l/ha) and Abacus (1.5 l/ha) secured the highest yield increase (12.9 t/ha) in relations to the control object. A high yield increase (12.5 t/ha) was observed in condition of Rex Duo (0.7 l/ha) + Amistar Extra (0.75 l/ha) application.