By James G. Horsfall
Plant illness: a sophisticated Treatise
summary: Plant affliction: a complicated Treatise
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Extra info for Plant Disease: An Advanced Treatise. How Disease Is Managed
Westcott, Cynthia. Westerdijk, Johanna. Whetzel, H. H. Woronin, M. Zallinger, J . P. A major accomplishment Pioneer bacteriologist. " A predispositionist His disproof of spontaneous generation was ignored Made physiological specialization pay off in rust control Nobel Prize for first crystallization of a virus Good early textbook on plant pathology Emphasized appraisal of losses due to disease Concluded that the cereal rusts were parasites First soil treatment (sulfur for onion smut) An ancient who studied and described plant diseases ca.
SANDS technicians. The profile provides chemical information which may permit a better understanding of the disease. General and Specific Tests All tests tend to separate into two types. The first is a nonspecific general test, such as that used in the early sections of diagnostic keys, which separates the possibilities into usually two clearly different groups. With three tests, where each test result is plus or minus, eight different groups can be differentiated ( 2 3 = 8 ) . Specific tests differentiate a single group from all others, are most often found near the end of determinative procedures, and only three different groups can be differentiated ( 3 1 = 3 ) .
35 35 36 36 37 37 38 38 38 39 39 39 39 40 40 41 42 42 43 43 46 46 47 48 48 49 49 I. INTRODUCTIO N Once the sociology of plant pathology is out of the way, the next chapter in a volume on disease management must be diagnosis. Without diagnosis there can be no disease management. II . DIAGNOSI S I S A N A R T FOR M During the long post-Renaissance struggle out of ignorance and superstition, as discussed in the previous chapter, diagnosis was simply a 35 36 JOH N L . MCINTYR E AND DAVID C.
Plant Disease: An Advanced Treatise. How Disease Is Managed by James G. Horsfall