Effect of SeedborneDiaporthe phaseolorumvar.sojaeon Germination, Emergence, and Vigor of Soybean Seedlings

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Abstract
Soybean (G. max) seed lots [244] were assayed over 3 yr for infection by D. phaseolorum var. sojae (DPS) by using an agar health test, and for germination, vigor and emergence in laboratory and greenhouse tests. Field emergence was recorded at several locations. Simple correlation coefficients were computed between the incidence of DPS and measurements of germination, vigor and greenhouse and field emergence. Correlations between DPS and germination or vigor in the official towel test and the modified towel test were often negative and highly significant (P = 0.01). Correlations between DPS and nearly all of the results of the accelerated aging test and between most of the measurements from the sand bench and cold tests were not significant. The correlations between DPS and field emergence were sometimes negative and highly significant but were of lower magnitude than in the germination and vigor tests. Results indicate a definite inverse relationship between infection of soybean seeds by DPS and their germination, vigor and field emergence. The need for large-scale comprehensive studies to assess the effects of infection by seedborne pathogens on seed quality and seedling performance was confirmed. The official towel test and the modified towel test best determined the effect of seed-borne DPS on soybean seed quality. The former may be used for this purpose because it is simpler than the latter.

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