Dynamics of the number of grape thrips (Drepanothrips reuteri Uzel.) in grape agrocenoses of the Southern Black Sea region of Ukraine

Abstract

Goal. To study population dynamics of grape thrips (Drepanothrips reuteri Uzel.) and determine the factors influencing the increase in the number and harmfulness in grape agrocenoses of the southern Black Sea region of Ukraine.
 Methods. Field surveys of vine plantations and counts of the number of pests were carried out according to generally accepted methods during 2017—2020 in conditions of research farms SE «EF Suvorov’s» and SE «EF Tairove» NSC «V.Ye. Tairov Institute of Viticulture and Winemaking».
 Results. It was found that in the conditions of the southern Black Sea zone of Ukraine there is an increase in the species composition and area of sucking phytophages in grape agrocenoses, especially some species of thrips. Among herbivorous thrips, species characteristic of this zone grape (Drepanothrips reuteri Uzel.) and tobacco (Thrips tabaci Lind.), several more harmful species appeared: variegated (Frankliniella intonsa Trybom), yellow (Thrips flavus Schrank), nightshade (Thrips fuscipennis Haliday), pear (Taeniothrips inconsequens Usel) and greenhouse (Heliothrips haemorrhoidalis Bouche). The number of thrips on grape leaves during the growing season is low — 0.3—4.8 motile individuals per 100 cm2 of leaf surface (corresponding to one average leaf), but the difference between susceptible and tolerant varieties can be traced even with a small presence of thrips. The highest degree of infestation and leaf damage was recorded in grape varieties without pubescence or with weakly pubescending leaves.
 Conclusions. Based on the results of the long-term (2017—2020) monitoring of the phytosanitary state of industrial grape plantations in the southern Black Sea region, it has been established that Thrips (Thysanoptera) occupy an important place among pests, the most common are grape thrips (Drepanothrips reuteri Uzel.), The mass development of which occurs every year during the flowering period of grapes. Research has established that the varietal composition of grape plantations and features climatic conditions of the southern Black Sea coast of Ukraine are favorable for overwintering, development, distribution and accumulation of numbers grape thrips and other sucking pests. It makes you spend constant monitoring, determination of biophenology in order to develop effective methods of regulating their quantity and harmfulness.