Foliage damage by leaf-eating insects during mass reproduction causes deterioration of the sanitary state of forest and a decrease in its increment. Timely detection of pest foci allows reducing the cost of their elimination and preventing negative consequences for stands. The purpose of this study was to identify the species composition of leaf-eating insects on the territory of State Enterprise Zhytomyrske Forestry and the subcompartments with the greatest threat of foci development of the dominant species – Tortrix viridana, taking into account forest site conditions and stand structure. During the feeding period, the species composition of leaf-eating insects was identified, and after the end of oviposition, the density of Tortrix viridana egg masses was assessed on tree branches selected in subcompartments with different forest site conditions, age, the relative crop density, and proportion of oak in the stand composition. The database of forest inventory (Ukrderzhlisproekt) and the score assessment of the preferences of stands for foci development were used. Eleven species of leaf-eating insects from order Lepidoptera were identified, including 9 species from the family Tortricidae, of which Tortrix viridana dominated. The highest egg mass density of this pest was assessed in fresh dubrava conditions (D2 ), in pure oak plantations aged 40-80 years with a low relative crop density. The average score of stand preference for Tortrix viridana was assessed by forest site conditions (2.93 and 2.88 for seed plantations and coppice forest, respectively), age (3.65), the relative density of stocking (2.6), and oak participation (3.3) in the State Enterprise Zhytomyrske Forestry. The list of subcompartments with a very high and high threat of an outbreak of Tortrix viridana has been established. A survey in these subcompartments would allow timely detection of pest population increase and prevent its development
У дубових насадженнях Житомирської області комахи-листогризи весняного комплексу з початку ХХІ століття утворили два спалахи масового розмноження – у 2002–2008 і 2010–2018 рр. Максимальну з початку ХХІ століття площу осередків комах-листогризів (понад 3000 га) відзначено в державних підприємствах (ДП) «Бердичівське ЛГ», «Житомирське ЛГ» та «Городницьке ЛГ», а питому площу осередків – у ДП «Городницьке ЛГ» (633,5 га на 1000 га). Найбільші площі осередків хвороб у дубових насадженнях припадають на поперечний рак дуба (збудник – бактерія Pseudomonas quercus Schem), трутовик дубовий несправжній (Phellinus robustus Bourd. et Galz.) та опеньок осінній (Armillaria sp.). Збільшення площ осередків поперечного раку дуба відзначено в роки згасання спалахів весняного комплексу комах-листогризів – у 2008 і 2013 рр. Найбільші площі осередків шкідливих організмів виявлено в ДП «Бердичівське ЛГ».
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.