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By J. E. Van Der Plank

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For the purpose of this particular chapter we need dig no deeper. The Poisson equation—Eq. 2)—has two parameters, a and N. and its curve is defined by them. But its modification—Eq. 2)—has many, indeed countless, parameters; and the form of the disease/inoculum will vary in countless ways. , no point of inflexion—as distinct from an asymptote. This distinguishes Curve B from Curve C of Fig. 7. Consider some examples. 1 relates the number of lesions to the number of spores of Uromyces phaseoli/cm2 of bean leaf.

12. 15 The Complex Virus Story 31 100 200 VIRUS CONCENTRATION mg/liter Fig. 19 The relation between the number of lesions per half-leaf of Nicotiana glutinosa and the concentration of tobacco mosaic virus, in milligrams per liter, in the inoculum. ) Judged by lesion numbers, only a few microns of this curve near the origin is relevant to natural infection; the rest is artifact. practically a straight line from the origin. Disease is proportional to inoculum; and infection starts from a single virus particle acting independently of all others.

Thus, in the data on bean rust in Fig. 1, there was an average of 1 lesion per 11 spores, so the parameter was 1/11. For the purpose of this particular chapter we need dig no deeper. The Poisson equation—Eq. 2)—has two parameters, a and N. and its curve is defined by them. But its modification—Eq. 2)—has many, indeed countless, parameters; and the form of the disease/inoculum will vary in countless ways. , no point of inflexion—as distinct from an asymptote. This distinguishes Curve B from Curve C of Fig.

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