dry rot vs perishing

dry rot

noun
  • Any progression of decay, corruption, or obsolescence. 

  • The crumbly, friable decayed portions of wooden members of buildings, especially at or below grade, usually caused by a fungal infection. 

  • A fungal infection which affects plants, in particular potatoes. 

perishing

noun
  • The act of something that perishes; decay or destruction. 

adj
  • Extreme; used of environmental or bodily conditions. 

  • Extremely cold. 

How often have the words dry rot and perishing occurred in a corpus of books? (source: Google Ngram Viewer )