Mike Soika, Lane Tredway, and Kerrie Fersch

Department of Plant Pathology, NC State University

 

Brown patch is the most common and destructive disease of tall fescue in the Southeastern United States. Fungicides belonging to the QoI class of chemistry (Compass, Disarm, Heritage, and Insignia) provide very effective control of this disease when applied every 21-28 days. Until recently, the QoIs were only available in spray formulations, but granular formulations are now becoming more widely available. The purpose of this demonstration is to compare some of the currently available granular fungicides for brown patch control in tall fescue. In our experience, these granular products provide very good control but must be applied more frequently or at higher rates as compared to their sprayable counterparts. All treatments were applied on a 28-day interval beginning on June 10, 2010 using a Gandy drop-spreader.

 

 

Treatment List (listed in order from left to right)

 

1.   Pillar 0.81G (pyraclostrobin + triticonazole, 3 lbs product per 1000 ft2)

2.   Heritage 0.31G (azoxystrobin, 4 lbs product per 1000 ft2)

3.   Headway 1.06G (azoxystrobin + propiconazole, 4 lbs product per 1000 ft2)

4.   Disarm 0.25G (fluoxastrobin, 4.6 lbs product per 1000 ft2)

5.   Untreated