Determining the Sensitivity of Early Cercospora Arachidicola and Late Cerosporidium Personatum Leaf Spot to the Strobilurin Fungicides Pyraclostrobin and Azoxystrobin

Institution:

University of Florida

Budget ID:

1303

Project ID:

412

Report BID:

State:

Georgia

Region:

Southeast (GA, FL, AL)

State Group:

GA-164

Project Fiscal Year:

2014

Category:

Pest/Disease

Report Type:

Report Received Date:

Investigator:

Stevenson

Project NPB Budget:

$4,180

In recent years, the efficacy of sterol fungicides (i.e., tebuconazole) to control early leaf spot (ELS) and late leaf spot (LLS) diseases has decreased, which has led costly adjustments in many peanut spray management programs. Often the overuse of a fungicide in disease management programs can lead to this reduction in product efficacy. An increase in the use of the strobilurin fungicides azoxystrobin (Abound) and pyraclostrobin (Headline) is expected as the patents expire on these fungicides in the next few years. Resistance to strobilurin fungicides has already been observed in the soybean pathogen Cercospora sojina, which is closely related to the ELS and LLS pathogens. Establishing a program to monitor sensitivity of the leaf spot pathogens to these fungicides will be critical for maintaining and monitoring the utility of these "at-risk" fungicides in the future.

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