In oak stands in Zhytomyr Region, the foci of foliage browsing insects of spring complex are registered. Since the beginning of the 21st century, there have been two outbreaks of these pests (in 2002–2008 and 2010–2018). Maximal foci area (over 3,000 ha) was registered in the State Forest Enterprises “Berdychivske”, “Zhytomyrske” and “Gorodnytske”, and maximal specific foci area in the State Forest Enterprise “Gorodnytske”(633.5 ha per 1,000 ha of oak stands). The largest area of diseases in oak stands was registered for oak bacterial cancer (the pathogen Pseudomonas quercus Schem), and fungal diseases caused by Phellinus robustus Bourd. et Galz. and Armillaria sp. The area of oak bacterial cancer increased in the years when foliage browsing insects outbreaks were decaying (in 2008 and 2013). The largest area of insect pests and diseases were registered in the State Forest Enterprise “Berdychivske”.
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