ABSTRACT

It is established impact of vine phytoalexin stilbenoids on propagation of powdery mildew (Uncinula necator) under lab and in vineyard conditions. In experiment are used Georgian red and white grape varieties. In concrete: Rkatsiteli( white) from a 40year old vineyeard cultivated in Telavi district; tsitska (white) from a 12year old vineyeard cultivated in Mtsketa district; Saperavi (red) from a15years old vineyard cultivated in Gurjaani district. In natural conditions experiment was held on Rkatsiteli and Saperavi grapes varieties In east Georgia. In experiment were used following stilbenoids: transresveratrol, trans-e-viniferin and total stenbenoids obtained from vines. It has been established their inhibitory effect on the propagation of Uncinula necator. Under lab it is investigated phytoalexin stilbenoids 100% biological affectivity: pre-treated grapes with freshly made water suspension of 5 mg/100ml (total stilbenoids praparation, trans-e-viniferine and trabs-resveratrol) completely(100%) inhibited Uncinula necator. In vineyard same total stilbenoids preparation showed less biological effect in test on Rkatsiteli and Saperavi grapes. It is determined for rkatsiteli grapes variety biological efficiency in the range of 80.00% -84.62% and for saperavi 83.33%-86.67 % range. This result is lower compared to the effectiveness of Bordeaux mixture. It ranges from 96.66% to 100% for Saperavi. The results of the study are scientific novelties for above mentioned grapes variety and it is important to establish a correlation between their immunity and phytoalexin stilbenoids. Key words: vine; stilbenoids; powdery mildew; Biological efficiency
Publication date: 01/12/2021

https://ijbpas.com/pdf/2021/December/MS_IJBPAS_2021_DEC_SPCL_2020.pdf

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https://doi.org/10.31032/IJBPAS/2021/10.12.2020