HMS Royal Oak (1892) well as the Cruiser Squadron. In April 1904, while operating with the Home Fleet off the Scilly Isles, "Royal Oak" and her sister ship "Revenge" had their bottoms lightly damaged when they struck a sunken wreck. On 9 May 1904, "Royal Oak" became flagship of the Home Fleet's second-in-command, relieving her sister "Empress of India", and took part in annual maneuvers in July and August. On 7 March 1905, "Royal Oak" paid off at Portsmouth into the Chatham Reserve, and her crew transferred to the battleship "Caesar". The following day the ship recommissioned with a skeleton crew for service with
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