DISEASES OF PLANTS. 837 
§ 804: 
These diseases of plants .aré either’ such ds are 
brought on externally only, by accidents and the — 
like; or such as originate from a corruption of the 
sap and other internal affections destroying organiza- 
tion itself. To the first kind belong wounds, frac- 
tures, fissures, preternatural defoliations, haemorr- 
hagy, mildew, honey- dew, rubigo, lepra; galls ; the 
folliculus carnosus, contorsions, warts, moles, squa- 
mations, the bedeguar. To the second class of diseases 
belong chlorosis, icterus, anasarca, phthiriasis, vermi- 
natio, tabes, deliquium, suffocatio incrementi, exul- 
ceratio, carcinoma, necrosis, gangraena, ustilago, mu- 
tilatio, monstrositas, sterilitas, and abortus. 
§ 305. 
Vulnus, or a wound, is a separation of the solid 
parts by external violence. It is given either purposely 
by cutting off branches and the like, or happens acci- 
dentally, by cattle, for instance, rubbing against a 
plant ; or from friction of two plants, or by the wind 
agitating the stem; by the bite of animals, by a 
separation of the parasitic plants, or even by 
large hailstones. In all those and similar cases, it 
is necessary to prevent the access of air to it, by 
some good firm cement, or grafting wax. But if 
the wound has remained long uncovered and ex- 
posed both to wind and rain, and is of a great size, 
then the affected part must be taken off as far down 
as the sound wood, to prevent greater mischief, and 
the whole afterwards be covered with wax. ) 
(aso YX The 
