In this thesis, research has been carried out on the spring distribution of overwintered oak mesh bedstead imagas depending on the degree of development of oak leaves. Oak mesh bedbug (Corythucha arcuata) is an invasive species of pest originating in North America that causes a number of symptoms (discoloration of the leaf on which it is located) and damage (drying and premature decline of leaves), and was recorded in Croatia in 2013. The aim of this paper was to determine the differences in the spatial distribution of overwintered oak mesh bedstead imagas, that is, to monitor the bedbug's rush to the leaves of the alkaline leaf on the object, which covers the entire spectrum from the earliest forms to the latest (Quercus robur var. praecox – Quercus robur var. tardissima). The area of research was a test plantation of the Jastrebarsko pedunculate oak, which is located in the area of UŠP Karlovac, where field outings were made. Onfield studies, in addition to the collected samples of oak leaves from early and late oak trees in phenophases 2 and 7, a drone test plantation was imaging. In the laboratory, collected samples of oak leaves of pedunculate were extracted on which egg litters were spotted and recorded, after which they were scanned with a scanner. The resulting images of the scanned sheets are digitally processed in the ImageJ computer program. With the use of a computer program, the results were obtained, which presented tabulatedly and graphically, in which the total surfaces, damaged surfaces and the percentages of damage to aphids caused by the influence of an oak mesh bed depending on the degree of development of oak leaves (phenophase 2 and 7) are presented. Based on the objectives set in this paper, a slight difference of arrivals of egg litters on the lower sides of pedunculate oak leaves was found, between phase 2 and phase 7 of pedunculate oak phenology, and greater and more exposed gusts of overwintered oak mesh bed imaga on the leaves of early oaks, while theexposureis extremely shorteronthe leaves of late oaks.