Resistance of different varieties of blackcurrant to Palomena Prasina in the conditions of Polissya, Ukraine

Abstract

Blackcurrant is a valuable crop for human health. Currants are damaged by about 40 species of pests, including nematodes, mites, and bedbugs. Recently, a number of bedbugs, Palomena zalena, have been gain- ing mass population, so the purpose of the research was to study the resistance of blackcurrants to this phytopha- gous pest, since mass outbreaks have occurred in recent years. The study of the resistance of different varieties of blackcurrant to green palmate leafhopper was conducted for the first time in Central Polesie, Ukraine. According to the European scale, the degree of harmfulness of green palmate leafhopper was determined at 4-5 points based on the finely-focused characteristics of the signs of phytopha- gous population of blackcurrant plants. Observations over the years of research on different-aged larvae of the green palm weevil were carried out on each variety. Infestation on different varieties of blackcurrant occurred in the first dec- ade of May, but in different indicators that mainly fall on the average level of infestation. The biological development of green palomena on varieties was compared with the biolog- ical development of black currant, and therefore the pheno- phases of “bud extension”, “flowering” and “berry growth” played a leading role in the metamorphosis of the insect. Green palomena has one generation in its development cycle, in which the age-old larvae have four stages of trans- formation in terms of biological development. In the process of studying the plant’s resistance to the phytophagous, the yield indicators of berries were calculated. Taking into account the assessment of productivity, the varietal collec- tion was divided into resistant and unstable varieties, and therefore the best result in the studies was obtained by the variety Chernecha, Titania and Lydia where the yield was 5.4–5.8–6.3 t/ha, with an energy efficiency coefficient of 2.12–2.16–2.22 units. Therefore, the blackcurrant varieties Chernecha, Titania and Lydia, resistant to green palmoena, can be recommended for introduction into production, their energy efficiency of cultivation is 9241–9520 mJ/ha.