The occurrence of drought and wood borer insects several outbursts in recent years has caused a high percentage of oak forests in Ilam to become dry or damaged. To this end, during three consecutive years (2013-2015), by examining the infected trunks in the forest and breeding larvae of different species in cages and keeping infected trunks in closed containers, different wood borers were collected and identified. Also necrosis in four regions of the province including the base necrosis,

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... s cause and re-growth were evaluated. The results showed that wood borer pests include these species: Cerambyx cerdo (Linnaeus, 1758) (Col., Cerambycidae); Macrotoma scutellaris (Germar, 1817) (Col., Cerambycidae(Chalcophorella bagdadensis (Laporte & Gory, 1836) (Col., Buprestidae) Agrilus hastulifer (Ratzeburg, 1839) (Col., Buprestidae) Chrysobothris parvipuncta (Obenberger, 1914) (Col., Buprestidae) Lampetis mimosa (Klug, 1829) (Col., Buprestidae). 10.31 % of the bases were dried completely, and in 90% of the bases symptoms of charcoal disease and wood borer beetles were found. Good rainfall in the last year decreased the necrosis process and on average 24% of dry bases re-grew.