Defining Fungicide Resistance Mechanisms in the Population from Mississippi Soybean.

Target spot, caused by , is a common lower canopy soybean disease in the southern United States. Recently, target spot has resurged in importance especially following the identification of resistance to the quinone outside inhibitor (QoI) fungicides. As a result, a survey of from soybean throughout Mississippi began in 2018.

Evaluating In Vitro Fitness Parameters of G143A-Containing and Wild-Type Isolates from Mississippi Soybean.

Quinone outside inhibitor (QoI) fungicides have been widely used to manage diseases of soybean including target spot caused by . However, resistance to QoI fungicides has recently been reported within the population from Alabama, Arkansas, Mississippi, and Tennessee as a result of isolates in the population containing the G143A amino acid substitution. Therefore, the relative fitness and stability of isolates containing the G143A substitution compared with wild-type isolates from Mississippi soybean were investigated by analyzing several fitness parameters in vitro.

, sp. nov., is an emerging root-associated pathogen responsible for taproot decline of soybean in the southern United States.

Taproot decline (TRD) is a disease of soybean that has been reported recently from the southern United States (U.S.).