Match fungal disease to best fungicide application timing

• By Yeshi Wamishe and Jarrod Hardke •

Drs. By Yeshi Wamishe, Extension rice pathologist, and Jarrod Hardke, Extension rice agronomist, provide the optimum fungicide timing window for various fungal diseases below. You also can download this information and more by clicking HERE

fungicide disease chart

Blast: For neck and panicle blast, two applications may be required for maximum suppression with the first at late boot to 10% heading and the second at 50-75% head out. If the necks of the main and secondary tillers are out of the boots, fungicide application is too late.Increase flood depth for early season leaf blast. In cases of leaf burn down, spot treat.

Sheath blight: Boot application followed by heading spray application may be required if cultivar is S or VS; early application is needed if disease starts early followed by PD to boot application.

Kernel and false smut: Timing is narrow and critical. >6 Oz/Acre rate of Propiconazole equivalent is critical to maximize protection/suppression.

Hydrogen sulfide (H2S) toxicity and straighthead: follow the “drain and dry” strategies.

Bacterial panicle blight (BPB): Hard to predict and too late after symptoms are seen.

Check product labels. Labels are the rules. Also refer to MP154 and Timing.

Dr. Yeshi Wamishe is a University of Arkansas Extension rice pathologist. She may be reached at Dr. Jarrod Hardke is the University of Arkansas Extension rice agronomist. He may be reached at

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