As befits a volume in the Advanced Series in Agricultural Sciences, this
book was written with problems of practical agriculture in mind. One of
the ways of controlling plant disease is by using resistant cultivars;
and from the wide literature of genetics and biochemistry in plant
pathology I have emphasized what seems to bear most closely on breeding
for disease resistance. This has a double advantage, for it happens all
to the good that this emphasis is also an emphasis on primary causes of
disease, as distinct from subsequent processes of symptom expression and
other secondary effects. The chapters are entirely modern in outlook.
The great revolution in biology this century had its high moments in the
elucidation of the DNA double helix in 1953 and the deciphering of the
genetic code in 1961. This book, so far as I know, is the first in plant
pathology to be conceived within the framework of this new biology. Half
the book could not have been written 20 years ago, even if there had
then been available all the literature that has since accumulated on the
genetics and chemistry of plant disease. The new biology is the cement
this book uses to bind the literature together. Another feature of this
book is an emphasis on thermodynamics.