Effect of fungicides on suppression of fungal infection during long-term storage of belarusian apple varieties

Abstract

In 2013-2015 in the Institute for Fruit Growing a comparative study of preservation of apple fruit of cvs. ‘Verbnae’, ‘Vesyalіna’, ‘Darunak’, ‘Imant’ grown with different fungicide treatment, after long-term storage was done and the effectiveness of the treatments for residual storage effect was evaluated.

Treatment with any fungicide (Delan – 0.7 kg/ha, Merpan – 1.8 kg/ha, Bellis – 0.8 kg/ha, Luna Tranquility – 1.0 l/ha) at least 21 days before the expected date of harvesting improved fruit preservation during long-term storage. The highest output of marketable products was watched in the variants with treatment with systemic fungicides Bellis and Luna Tranquility – cv. ‘Verbnae’ – 92.3 and 93.0 %, ‘Vesyalіna’ – 93.0 and 93.2 %, ‘Darunak’ – 92.0 and 92.3 % and ‘Imant’ – 90.2 and 91.3 %, respectively. When using contact chemicals Delan and Merpan the output of marketable fruit was 89.1 % and 90.2 % for cv. ‘Verbnae’, 92.5 % and 91.9 % – ‘Vesyalіna’, 88.3 % and 89.2 % – ‘Darunak’, 89.2 % and 90.1 % – ‘Imant’. In the control group the amount of marketable fruit did not exceed 84.0-91.1 % depending on the variety.

The residual effect of fruit storing of apple of cv. ‘Verbnae’ was 10 days in the control and in the variant with the use of Delan, 15 days – using Bellis, Luna Tranquility and Merpan; cv. ‘Vesyalіna’ – 10 days, ‘Darunak’ and ‘Imant’ – 15 days, regardless of the variants of the experiment.