Rеaction of newly selected vine forms to gray rot (Botrytis cinerea Pers.)

Iliana Ivanova, Ralitsa Mincheva, Galina Dyakova, Gergana Ivanova-Kovacheva

Abstract: During the period 2014-2018, in Agricultural Academy – Sofia, at the experimental vineyard of the Institute of Agriculture and Seed Science «Obraztsov Chiflik» – Rousse, a study was conducted with breeding wine vine forms to determine their reaction to gray rot, caused by the fungus Botrytis cinerea Pers. The following elite wine hybrid forms have been studied: 25/12
(Pamid Ruse 1 x Kaylashki Misket), 5/51 (Naslada x Chardonnay), 5/83 (Naslada x Chardonnay) and 25/54 (Pamid Ruse 1 x Kaylashki Misket). Misket Otonel variety was chosen as control due to the white color and the muscat aroma of the grapes.
The phytopathological assessment was performed on the scale of OIV 453, where the resistance was presented in 5 degrees from 1-3-5-7-9, as the lowest degree 1 corresponded to maximum resistance. The following traits were also monitored: grape weight (g), ripening period, sugar content (%), acid content (g/l), grape color. It was found that breeding forms 5/51, 25/12 and 25/54 were resistant to Botrytis cinerea Pers., and 5/83 (Naslada x Chardonnay) was medium resistant. The higher resistance, compared to the control, was genetically determined. A strong correlation (-0.844) was found between the yield and the development of the disease.

Keywords: Botrytis cinerea Pers.; grapevine; gray rot; sensitivity; Vitis ssp.

Date published: 2023-06-28