Seed-borne plant virus diseases by K. Subramanya Sastry

Author:K. Subramanya Sastry
Language: eng
Format: epub
Publisher: Springer India, India

7.1 Introduction

Epidemiology of seed-transmitted viruses provides a scientific modern theory of epidemic development. Vander Plank (1963, 1982) has provided a unifying concept for its quantitative study and the use of mathematical models to describe, interpret and predict the progress of epidemics insight for effective disease management based on certain principles like environmental factors, sources of infection, vectors and their population dynamics. The value of epidemiological approach lies in its ability to stimulate questions on ‘How many of the viruses are seed transmitted? How are they spreading? How much infection starts from sources other than seeds?’ Vander Plank (1963, 1982) suggested that the relationship between the amount of initial inoculum (Xo), average infection rate (r) and the time (t) over which infection occurs determines the amount of disease (x) that develops. The equation X = Xo ert helps in determining the rate of disease at a given moment of time. Zadoks and Schein (1979), Leonard and Fry (1986) and Khetarpal and Maury (1998) have considered disease control from an epidemiological standpoint and a primer as well as a base in advanced studies.

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