HMS Royal Oak (1892) relieved by the battleship "Bulwark" and departed the Mediterranean in May 1902. She arrived at Plymouth on 16 May, and at Portsmouth the following day, and paid off there on 6 June 1902. She soon moved to Chatham Dockyard for a refit, during which casemates were provided for her six-inch upper deck guns. On 16 February 1903, "Royal Oak" recommissioned at Portsmouth for service in the Home Fleet using part of the battleship "Nile"'s crew as a nucleus. In the summer of 1903, she participated in combined exercises in the Atlantic involving the Home Fleet, Mediterranean, and Channel Fleets, as
Oak "Lymantria dispar", which can defoliate oak and other broadleaved tree species in North America. A considerable number of galls are found on oak leaves, buds, flowers, roots, etc. Examples are oak artichoke gall, oak marble gall, oak apple gall, knopper gall, and spangle gall. A number of species of fungus cause powdery mildew on oak species. In Europe the species "Erysiphe alphitoides" is the most common cause. A new and yet little understood disease of mature oaks, acute oak decline, has been reported in parts of the UK since 2009. Oak processionary moth ("Thaumetopoea processionea") has become a serious threat