Black currant varieties woody cuttings heat treatment influence (Ribes nigrum L.) on resistance to the bud mites (Cecidophyopsis ribis Westw.)

This paper considers the results of a two-year experiment on assessing the effect of heat treatment and varietal characteristics on resistance to bud mites on lignified blackcurrant cuttings. Black currant is one of the most widespread and demanded berry crops in Russia. However, it can be severely damaged by currant bud mites, resulting in great damage to berry products. Black currant is often propagated by lignified cuttings. Sometimes harvested cuttings become unsuitable for propagation due to damage to the kidneys by a tick. In this regard, there is a need to establish methods for obtaining healthy cuttings. A full two-factor experiment was conducted, performed in 2020-2021. The following varieties were used: Selechenskaya, Krasa Altaya, Belorusskaya, Vologda and Ekzotika. Temperature exposure was carried out at temperatures of 20 °C, 43 and 45 °C. A two-way analysis of variance on the variability in the number of living individuals of the bud mite, depending on varietal characteristics and the temperature background on currant cuttings, showed a significant effect of all factors. The temperature background makes the greatest contribution to the variability (58 %). The variety most susceptible to the mite, Krasa Altaya, was determined. The cultivars Selechenskaya, Belorusskaya, Vologda and Ekzotika turned out to be the most resistant. Temperature exposure of cuttings at a temperature of 43-45 °C for 15 minutes proved to be effective in combating bud mites and obtaining healthy cuttings.