Phomopsis viticola management in Târnave Vineyards

Abstract

Phomopsis viticola, in poorly managed vineyards can produce a lot of damage due to its year to year infection pattern. In combination with a high spore reserve from the previous year, this causes reduced grape yields. This study aims to assess the Phomopsisviticola attack in Târnave vineyards during May-July 2020. The data (frequency and intensity of the attack) was collected from Crăciunelu de Jos, and the attack degree (AD) was calculated before and after the treatments for Saugvinonblanc, Riesling italian, Fetească regală and Traminer roz grapevine varieties. The AD before the treatment with contact and systemic products was between 27.80% and 4.10%, after the treatments of the first period (May-June 2020) the AD was reduced at values between 3.40% and 0.83% and after the treatments of the second period (June-July 2020) the AD had the values between 9.00% and 12.40%. In conclusion, the fungicide treatments administrated are efficient in managing Phomopsis viticola in vineyards from Transylvania.