A Study of Distribution and Sampling of Soybean Plants Naturally Infected withPseudomonas syringaepv.glycinea

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Abstract
Soybean (G. max) plants were grown in a field plot (42. .times. 53.9 m) at Ottawa [Canada] in 1978, and similar sized areas from 8 farmers'' fields were examined in 1982 for the presence of bacterial blight caused by P. syringae pv. glycinea. Tagged plants were assessed several times during the growing season. The pattern of disease occurrence was investigated by using 3 existing indices of nonrandomness and a 4th method was proposed and applied. Diseased plants were distributed nonrandomly from early to midseason. Samples of various sizes following 3 types of sampling paths were taken to estimate disease incidence. Simple random samples were inadequate to assess disease percentage when the underlying disease distribution was nonrandom.

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