Four Times of the Day is 29 May, Oak Apple Day, a public holiday which celebrated the Restoration of the monarchy (demonstrated by the oak boughs above the barber's sign and on some of the subjects' hats, which recall the royal oak tree in which Charles II hid after losing the Battle of Worcester in 1651). Alternatively, Sean Shesgreen has suggested that the date is 3 September, commemorating the battle of Worcester itself, a dating that preserves the seasonal progression from winter to spring to summer to autumn. Charing Cross was a central staging post for coaches, but the congested narrow road was a frequent
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