Use of the conductivity test to estimate soybean seed emergence and resistance to infection by Fusarium oxysporum in the southern United States

P.D. MeintsA, L.E. TrevathanB, and F.W. MaideniC

A Assistant Professor Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762, USA.

B Professor Department of Entomology and Plant Pathology, Mississippi State University, Mississippi State, MS 39762, USA.

C Chitedze Research Station, Lilongwe, Malawi.


Summary

This study was designed to evaluate the conductivity test as a tool to predict soybean susceptibility to Fusarium oxysporum and the effectiveness of a single fungicide seed treatment for arresting disease symptoms. The effects of cultivar, seed storage, and seed treatment on soybean emergence in inoculated media under controlled environmental conditions were investigated, as well as emergence in field soils. Fungicide treatments significantly improved emergence in controlled environment studies compared to an untreated control. Seedling emergence in infested medium in a controlled environment, or cool saturated field soil, was significantly negatively correlated (-0.92 - -0.97) with conductivity. Based on this correlation, it was concluded that the conductivity test could be developed as a tool to estimate soybean seed susceptibility to invasion by F. oxysporum.

 

Plant Protection Quarterly (2002) 17 (2) 64-66.